Fossil

    IdxHashEntry *pEntry;
    sqlite3_stmt *pExplain = 0;
    idxHashClear(&hIdx);
    rc = idxPrintfPrepareStmt(dbm, &pExplain, pzErr,
        "EXPLAIN QUERY PLAN %s", pStmt->zSql
    );
    while( rc==SQLITE_OK && sqlite3_step(pExplain)==SQLITE_ROW ){
      int iSelectid = sqlite3_column_int(pExplain, 0);
      int iOrder = sqlite3_column_int(pExplain, 1);
      int iFrom = sqlite3_column_int(pExplain, 2);
      const char *zDetail = (const char*)sqlite3_column_text(pExplain, 3);
      int nDetail = STRLEN(zDetail);
      int i;

      for(i=0; i<nDetail; i++){
        const char *zIdx = 0;
        if( memcmp(&zDetail[i], " USING INDEX ", 13)==0 ){
................................................................................
            idxHashAdd(&rc, &hIdx, zSql, 0);
            if( rc ) goto find_indexes_out;
          }
          break;
        }
      }

      pStmt->zEQP = idxAppendText(&rc, pStmt->zEQP, "%d|%d|%d|%s\n", 
          iSelectid, iOrder, iFrom, zDetail
      );
    }

    for(pEntry=hIdx.pFirst; pEntry; pEntry=pEntry->pNext){
      pStmt->zIdx = idxAppendText(&rc, pStmt->zIdx, "%s;\n", pEntry->zKey);
    }

    idxFinalize(&rc, pExplain);
................................................................................
  sqlite3expert *pExpert;
  int bVerbose;
};

/* A single line in the EQP output */
typedef struct EQPGraphRow EQPGraphRow;
struct EQPGraphRow {
  int iSelectId;        /* The SelectID for this row */

  EQPGraphRow *pNext;   /* Next row in sequence */
  char zText[1];        /* Text to display for this row */
};

/* All EQP output is collected into an instance of the following */
typedef struct EQPGraph EQPGraph;
struct EQPGraph {
................................................................................
** instance of the following structure.
*/
typedef struct ShellState ShellState;
struct ShellState {
  sqlite3 *db;           /* The database */
  u8 autoExplain;        /* Automatically turn on .explain mode */
  u8 autoEQP;            /* Run EXPLAIN QUERY PLAN prior to seach SQL stmt */

  u8 statsOn;            /* True to display memory stats before each finalize */
  u8 scanstatsOn;        /* True to display scan stats before each finalize */
  u8 openMode;           /* SHELL_OPEN_NORMAL, _APPENDVFS, or _ZIPFILE */
  u8 doXdgOpen;          /* Invoke start/open/xdg-open in output_reset() */
  u8 nEqpLevel;          /* Depth of the EQP output graph */
  unsigned mEqpLines;    /* Mask of veritical lines in the EQP output graph */
  int outCount;          /* Revert to stdout when reaching zero */
................................................................................
#endif
  ExpertInfo expert;        /* Valid if previous command was ".expert OPT..." */
};


/* Allowed values for ShellState.autoEQP
*/
#define AUTOEQP_off      0
#define AUTOEQP_on       1
#define AUTOEQP_trigger  2
#define AUTOEQP_full     3

/* Allowed values for ShellState.openMode
*/
#define SHELL_OPEN_UNSPEC     0      /* No open-mode specified */
#define SHELL_OPEN_NORMAL     1      /* Normal database file */
#define SHELL_OPEN_APPENDVFS  2      /* Use appendvfs */
#define SHELL_OPEN_ZIPFILE    3      /* Use the zipfile virtual table */
................................................................................
  }
  return 1;
}

/*
** Add a new entry to the EXPLAIN QUERY PLAN data
*/
static void eqp_append(ShellState *p, int iSelectId, const char *zText){
  EQPGraphRow *pNew;
  int nText = strlen30(zText);



  pNew = sqlite3_malloc64( sizeof(*pNew) + nText );
  if( pNew==0 ) shell_out_of_memory();
  pNew->iSelectId = iSelectId;


  memcpy(pNew->zText, zText, nText+1);
  pNew->pNext = 0;
  if( p->sGraph.pLast ){
    p->sGraph.pLast->pNext = pNew;
  }else{
    p->sGraph.pRow = pNew;
  }
................................................................................
  for(pRow = p->sGraph.pRow; pRow; pRow = pNext){
    pNext = pRow->pNext;
    sqlite3_free(pRow);
  }
  memset(&p->sGraph, 0, sizeof(p->sGraph));
}

/* Return the next EXPLAIN QUERY PLAN line with iSelectId that occurs after
** pOld, or return the first such line if pOld is NULL
*/
static EQPGraphRow *eqp_next_row(ShellState *p, int iSelectId, EQPGraphRow *pOld){
  EQPGraphRow *pRow = pOld ? pOld->pNext : p->sGraph.pRow;
  while( pRow && pRow->iSelectId!=iSelectId ) pRow = pRow->pNext;
  return pRow;
}

/* Render a single level of the graph shell having iSelectId.  Called
** recursively to render sublevels.
*/
static void eqp_render_level(ShellState *p, int iSelectId){
  EQPGraphRow *pRow, *pNext;
  int i;
  int n = strlen30(p->sGraph.zPrefix);
  char *z;
  for(pRow = eqp_next_row(p, iSelectId, 0); pRow; pRow = pNext){
    pNext = eqp_next_row(p, iSelectId, pRow);
    z = pRow->zText;
    utf8_printf(p->out, "%s%s%s\n", p->sGraph.zPrefix, pNext ? "|--" : "`--", z);
    if( n<sizeof(p->sGraph.zPrefix)-7 && (z = strstr(z, " SUBQUER"))!=0 ){
      memcpy(&p->sGraph.zPrefix[n], pNext ? "|  " : "   ", 4);
      if( strncmp(z, " SUBQUERY ", 9)==0 && (i = atoi(z+10))>iSelectId ){
        eqp_render_level(p, i);
      }else if( strncmp(z, " SUBQUERIES ", 12)==0 ){
        i = atoi(z+12);
        if( i>iSelectId ){
          utf8_printf(p->out, "%s|--SUBQUERY %d\n", p->sGraph.zPrefix, i);
          memcpy(&p->sGraph.zPrefix[n+3],"|  ",4);
          eqp_render_level(p, i);
        }
        z = strstr(z, " AND ");
        if( z && (i = atoi(z+5))>iSelectId ){
          p->sGraph.zPrefix[n+3] = 0;
          utf8_printf(p->out, "%s`--SUBQUERY %d\n", p->sGraph.zPrefix, i);
          memcpy(&p->sGraph.zPrefix[n+3],"   ",4);
          eqp_render_level(p, i);
        }
      }
      p->sGraph.zPrefix[n] = 0;
    }
  }
}

/*
** Display and reset the EXPLAIN QUERY PLAN data
................................................................................
        if( i>0 ) utf8_printf(p->out, "%s", p->colSeparator);
        utf8_printf(p->out,"%s",azArg[i] ? azArg[i] : p->nullValue);
      }
      utf8_printf(p->out, "%s", p->rowSeparator);
      break;
    }
    case MODE_EQP: {
      eqp_append(p, atoi(azArg[0]), azArg[3]);
      break;
    }
  }
  return 0;
}

/*
................................................................................
          sqlite3_db_config(db, SQLITE_DBCONFIG_TRIGGER_EQP, 1, 0);
        }
        zEQP = sqlite3_mprintf("EXPLAIN QUERY PLAN %s", zStmtSql);
        rc = sqlite3_prepare_v2(db, zEQP, -1, &pExplain, 0);
        if( rc==SQLITE_OK ){
          while( sqlite3_step(pExplain)==SQLITE_ROW ){
            const char *zEQPLine = (const char*)sqlite3_column_text(pExplain,3);
            int iSelectId = sqlite3_column_int(pExplain, 0);

            if( zEQPLine[0]=='-' ) eqp_render(pArg);
            eqp_append(pArg, iSelectId, zEQPLine);
          }
          eqp_render(pArg);
        }
        sqlite3_finalize(pExplain);
        sqlite3_free(zEQP);
        if( pArg->autoEQP>=AUTOEQP_full ){
          /* Also do an EXPLAIN for ".eqp full" mode */
................................................................................
  ".bail on|off           Stop after hitting an error.  Default OFF\n"
  ".binary on|off         Turn binary output on or off.  Default OFF\n"
  ".cd DIRECTORY          Change the working directory to DIRECTORY\n"
  ".changes on|off        Show number of rows changed by SQL\n"
  ".check GLOB            Fail if output since .testcase does not match\n"
  ".clone NEWDB           Clone data into NEWDB from the existing database\n"
  ".databases             List names and files of attached databases\n"

  ".dbinfo ?DB?           Show status information about the database\n"
  ".dump ?TABLE? ...      Dump the database in an SQL text format\n"
  "                         If TABLE specified, only dump tables matching\n"
  "                         LIKE pattern TABLE.\n"
  ".echo on|off           Turn command echo on or off\n"
  ".eqp on|off|full       Enable or disable automatic EXPLAIN QUERY PLAN\n"
  ".excel                 Display the output of next command in a spreadsheet\n"
................................................................................
    if( zErrMsg ){
      utf8_printf(stderr,"Error: %s\n", zErrMsg);
      sqlite3_free(zErrMsg);
      rc = 1;
    }
  }else





























  if( c=='d' && strncmp(azArg[0], "dbinfo", n)==0 ){
    rc = shell_dbinfo_command(p, nArg, azArg);
  }else

  if( c=='d' && strncmp(azArg[0], "dump", n)==0 ){
    const char *zLike = 0;
    int i;
    int savedShowHeader = p->showHeader;
................................................................................
      raw_printf(stderr, "Usage: .echo on|off\n");
      rc = 1;
    }
  }else

  if( c=='e' && strncmp(azArg[0], "eqp", n)==0 ){
    if( nArg==2 ){

      if( strcmp(azArg[1],"full")==0 ){
        p->autoEQP = AUTOEQP_full;
      }else if( strcmp(azArg[1],"trigger")==0 ){
        p->autoEQP = AUTOEQP_trigger;



      }else{
        p->autoEQP = (u8)booleanValue(azArg[1]);
      }
    }else{
      raw_printf(stderr, "Usage: .eqp off|on|trigger|full\n");
      rc = 1;
    }

    IdxHashEntry *pEntry;
    sqlite3_stmt *pExplain = 0;
    idxHashClear(&hIdx);
    rc = idxPrintfPrepareStmt(dbm, &pExplain, pzErr,
        "EXPLAIN QUERY PLAN %s", pStmt->zSql
    );
    while( rc==SQLITE_OK && sqlite3_step(pExplain)==SQLITE_ROW ){
      /* int iId = sqlite3_column_int(pExplain, 0); */
      /* int iParent = sqlite3_column_int(pExplain, 1); */
      /* int iNotUsed = sqlite3_column_int(pExplain, 2); */
      const char *zDetail = (const char*)sqlite3_column_text(pExplain, 3);
      int nDetail = STRLEN(zDetail);
      int i;

      for(i=0; i<nDetail; i++){
        const char *zIdx = 0;
        if( memcmp(&zDetail[i], " USING INDEX ", 13)==0 ){
................................................................................
            idxHashAdd(&rc, &hIdx, zSql, 0);
            if( rc ) goto find_indexes_out;
          }
          break;
        }
      }

      pStmt->zEQP = idxAppendText(&rc, pStmt->zEQP, "%s\n", zDetail);


    }

    for(pEntry=hIdx.pFirst; pEntry; pEntry=pEntry->pNext){
      pStmt->zIdx = idxAppendText(&rc, pStmt->zIdx, "%s;\n", pEntry->zKey);
    }

    idxFinalize(&rc, pExplain);
................................................................................
  sqlite3expert *pExpert;
  int bVerbose;
};

/* A single line in the EQP output */
typedef struct EQPGraphRow EQPGraphRow;
struct EQPGraphRow {
  int iEqpId;           /* ID for this row */
  int iParentId;        /* ID of the parent row */
  EQPGraphRow *pNext;   /* Next row in sequence */
  char zText[1];        /* Text to display for this row */
};

/* All EQP output is collected into an instance of the following */
typedef struct EQPGraph EQPGraph;
struct EQPGraph {
................................................................................
** instance of the following structure.
*/
typedef struct ShellState ShellState;
struct ShellState {
  sqlite3 *db;           /* The database */
  u8 autoExplain;        /* Automatically turn on .explain mode */
  u8 autoEQP;            /* Run EXPLAIN QUERY PLAN prior to seach SQL stmt */
  u8 autoEQPtest;        /* autoEQP is in test mode */
  u8 statsOn;            /* True to display memory stats before each finalize */
  u8 scanstatsOn;        /* True to display scan stats before each finalize */
  u8 openMode;           /* SHELL_OPEN_NORMAL, _APPENDVFS, or _ZIPFILE */
  u8 doXdgOpen;          /* Invoke start/open/xdg-open in output_reset() */
  u8 nEqpLevel;          /* Depth of the EQP output graph */
  unsigned mEqpLines;    /* Mask of veritical lines in the EQP output graph */
  int outCount;          /* Revert to stdout when reaching zero */
................................................................................
#endif
  ExpertInfo expert;        /* Valid if previous command was ".expert OPT..." */
};


/* Allowed values for ShellState.autoEQP
*/
#define AUTOEQP_off      0           /* Automatic EXPLAIN QUERY PLAN is off */
#define AUTOEQP_on       1           /* Automatic EQP is on */
#define AUTOEQP_trigger  2           /* On and also show plans for triggers */
#define AUTOEQP_full     3           /* Show full EXPLAIN */

/* Allowed values for ShellState.openMode
*/
#define SHELL_OPEN_UNSPEC     0      /* No open-mode specified */
#define SHELL_OPEN_NORMAL     1      /* Normal database file */
#define SHELL_OPEN_APPENDVFS  2      /* Use appendvfs */
#define SHELL_OPEN_ZIPFILE    3      /* Use the zipfile virtual table */
................................................................................
  }
  return 1;
}

/*
** Add a new entry to the EXPLAIN QUERY PLAN data
*/
static void eqp_append(ShellState *p, int iEqpId, int p2, const char *zText){
  EQPGraphRow *pNew;
  int nText = strlen30(zText);
  if( p->autoEQPtest ){
    utf8_printf(p->out, "%d,%d,%s\n", iEqpId, p2, zText);
  }
  pNew = sqlite3_malloc64( sizeof(*pNew) + nText );
  if( pNew==0 ) shell_out_of_memory();

  pNew->iEqpId = iEqpId;
  pNew->iParentId = p2;
  memcpy(pNew->zText, zText, nText+1);
  pNew->pNext = 0;
  if( p->sGraph.pLast ){
    p->sGraph.pLast->pNext = pNew;
  }else{
    p->sGraph.pRow = pNew;
  }
................................................................................
  for(pRow = p->sGraph.pRow; pRow; pRow = pNext){
    pNext = pRow->pNext;
    sqlite3_free(pRow);
  }
  memset(&p->sGraph, 0, sizeof(p->sGraph));
}

/* Return the next EXPLAIN QUERY PLAN line with iEqpId that occurs after
** pOld, or return the first such line if pOld is NULL
*/
static EQPGraphRow *eqp_next_row(ShellState *p, int iEqpId, EQPGraphRow *pOld){
  EQPGraphRow *pRow = pOld ? pOld->pNext : p->sGraph.pRow;
  while( pRow && pRow->iParentId!=iEqpId ) pRow = pRow->pNext;
  return pRow;
}

/* Render a single level of the graph that has iEqpId as its parent.  Called
** recursively to render sublevels.
*/
static void eqp_render_level(ShellState *p, int iEqpId){
  EQPGraphRow *pRow, *pNext;

  int n = strlen30(p->sGraph.zPrefix);
  char *z;
  for(pRow = eqp_next_row(p, iEqpId, 0); pRow; pRow = pNext){
    pNext = eqp_next_row(p, iEqpId, pRow);
    z = pRow->zText;
    utf8_printf(p->out, "%s%s%s\n", p->sGraph.zPrefix, pNext ? "|--" : "`--", z);
    if( n<sizeof(p->sGraph.zPrefix)-7 ){
      memcpy(&p->sGraph.zPrefix[n], pNext ? "|  " : "   ", 4);

      eqp_render_level(p, pRow->iEqpId);















      p->sGraph.zPrefix[n] = 0;
    }
  }
}

/*
** Display and reset the EXPLAIN QUERY PLAN data
................................................................................
        if( i>0 ) utf8_printf(p->out, "%s", p->colSeparator);
        utf8_printf(p->out,"%s",azArg[i] ? azArg[i] : p->nullValue);
      }
      utf8_printf(p->out, "%s", p->rowSeparator);
      break;
    }
    case MODE_EQP: {
      eqp_append(p, atoi(azArg[0]), atoi(azArg[1]), azArg[3]);
      break;
    }
  }
  return 0;
}

/*
................................................................................
          sqlite3_db_config(db, SQLITE_DBCONFIG_TRIGGER_EQP, 1, 0);
        }
        zEQP = sqlite3_mprintf("EXPLAIN QUERY PLAN %s", zStmtSql);
        rc = sqlite3_prepare_v2(db, zEQP, -1, &pExplain, 0);
        if( rc==SQLITE_OK ){
          while( sqlite3_step(pExplain)==SQLITE_ROW ){
            const char *zEQPLine = (const char*)sqlite3_column_text(pExplain,3);
            int iEqpId = sqlite3_column_int(pExplain, 0);
            int iParentId = sqlite3_column_int(pExplain, 1);
            if( zEQPLine[0]=='-' ) eqp_render(pArg);
            eqp_append(pArg, iEqpId, iParentId, zEQPLine);
          }
          eqp_render(pArg);
        }
        sqlite3_finalize(pExplain);
        sqlite3_free(zEQP);
        if( pArg->autoEQP>=AUTOEQP_full ){
          /* Also do an EXPLAIN for ".eqp full" mode */
................................................................................
  ".bail on|off           Stop after hitting an error.  Default OFF\n"
  ".binary on|off         Turn binary output on or off.  Default OFF\n"
  ".cd DIRECTORY          Change the working directory to DIRECTORY\n"
  ".changes on|off        Show number of rows changed by SQL\n"
  ".check GLOB            Fail if output since .testcase does not match\n"
  ".clone NEWDB           Clone data into NEWDB from the existing database\n"
  ".databases             List names and files of attached databases\n"
  ".dbconfig ?op? ?val?   List or change sqlite3_db_config() options\n"
  ".dbinfo ?DB?           Show status information about the database\n"
  ".dump ?TABLE? ...      Dump the database in an SQL text format\n"
  "                         If TABLE specified, only dump tables matching\n"
  "                         LIKE pattern TABLE.\n"
  ".echo on|off           Turn command echo on or off\n"
  ".eqp on|off|full       Enable or disable automatic EXPLAIN QUERY PLAN\n"
  ".excel                 Display the output of next command in a spreadsheet\n"
................................................................................
    if( zErrMsg ){
      utf8_printf(stderr,"Error: %s\n", zErrMsg);
      sqlite3_free(zErrMsg);
      rc = 1;
    }
  }else

  if( c=='d' && n>=3 && strncmp(azArg[0], "dbconfig", n)==0 ){
    static const struct DbConfigChoices {const char *zName; int op;} aDbConfig[] = {
        { "enable_fkey",      SQLITE_DBCONFIG_ENABLE_FKEY            },
        { "enable_trigger",   SQLITE_DBCONFIG_ENABLE_TRIGGER         },
        { "fts3_tokenizer",   SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER  },
        { "load_extension",   SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION  },
        { "no_ckpt_on_close", SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE       },
        { "enable_qpsg",      SQLITE_DBCONFIG_ENABLE_QPSG            },
        { "trigger_eqp",      SQLITE_DBCONFIG_TRIGGER_EQP            },
        { "reset_database",   SQLITE_DBCONFIG_RESET_DATABASE         },
    };
    int ii, v;
    open_db(p, 0);
    for(ii=0; ii<ArraySize(aDbConfig); ii++){
      if( nArg>1 && strcmp(azArg[1], aDbConfig[ii].zName)!=0 ) continue;
      if( nArg>=3 ){
        sqlite3_db_config(p->db, aDbConfig[ii].op, booleanValue(azArg[2]), 0);
      }
      sqlite3_db_config(p->db, aDbConfig[ii].op, -1, &v);
      utf8_printf(p->out, "%18s %s\n", aDbConfig[ii].zName, v ? "on" : "off");
      if( nArg>1 ) break;
    }
    if( nArg>1 && ii==ArraySize(aDbConfig) ){
      utf8_printf(stderr, "Error: unknown dbconfig \"%s\"\n", azArg[1]);
      utf8_printf(stderr, "Enter \".dbconfig\" with no arguments for a list\n");
    }   
  }else

  if( c=='d' && n>=3 && strncmp(azArg[0], "dbinfo", n)==0 ){
    rc = shell_dbinfo_command(p, nArg, azArg);
  }else

  if( c=='d' && strncmp(azArg[0], "dump", n)==0 ){
    const char *zLike = 0;
    int i;
    int savedShowHeader = p->showHeader;
................................................................................
      raw_printf(stderr, "Usage: .echo on|off\n");
      rc = 1;
    }
  }else

  if( c=='e' && strncmp(azArg[0], "eqp", n)==0 ){
    if( nArg==2 ){
      p->autoEQPtest = 0;
      if( strcmp(azArg[1],"full")==0 ){
        p->autoEQP = AUTOEQP_full;
      }else if( strcmp(azArg[1],"trigger")==0 ){
        p->autoEQP = AUTOEQP_trigger;
      }else if( strcmp(azArg[1],"test")==0 ){
        p->autoEQP = AUTOEQP_on;
        p->autoEQPtest = 1;
      }else{
        p->autoEQP = (u8)booleanValue(azArg[1]);
      }
    }else{
      raw_printf(stderr, "Usage: .eqp off|on|trigger|full\n");
      rc = 1;
    }

**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.24.0"
#define SQLITE_VERSION_NUMBER 3024000
#define SQLITE_SOURCE_ID      "2018-04-26 18:34:26 9fd0faf517993587d2f54212638545fc85fbbc84a031bcfae8c1e5894825d83b"

/*
** CAPI3REF: Run-Time Library Version Numbers
** KEYWORDS: sqlite3_version sqlite3_sourceid
**
** These interfaces provide the same information as the [SQLITE_VERSION],
** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros
................................................................................
** behavior. The first parameter passed to this operation is an integer -
** positive to enable output for trigger programs, or zero to disable it,
** or negative to leave the setting unchanged.
** The second parameter is a pointer to an integer into which is written 
** 0 or 1 to indicate whether output-for-triggers has been disabled - 0 if 
** it is not disabled, 1 if it is.  
** </dd>















** </dl>
*/
#define SQLITE_DBCONFIG_MAINDBNAME            1000 /* const char* */
#define SQLITE_DBCONFIG_LOOKASIDE             1001 /* void* int int */
#define SQLITE_DBCONFIG_ENABLE_FKEY           1002 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_TRIGGER        1003 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER 1004 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION 1005 /* int int* */
#define SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE      1006 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_QPSG           1007 /* int int* */
#define SQLITE_DBCONFIG_TRIGGER_EQP           1008 /* int int* */

#define SQLITE_DBCONFIG_MAX                   1008 /* Largest DBCONFIG */

/*
** CAPI3REF: Enable Or Disable Extended Result Codes
** METHOD: sqlite3
**
** ^The sqlite3_extended_result_codes() routine enables or disables the
** [extended result codes] feature of SQLite. ^The extended result
................................................................................
** using [sqlite3_free].
** Hence, if this variable is modified directly, either it should be
** made NULL or made to point to memory obtained from [sqlite3_malloc]
** or else the use of the [data_store_directory pragma] should be avoided.
*/
SQLITE_API char *sqlite3_data_directory;




































/*
** CAPI3REF: Test For Auto-Commit Mode
** KEYWORDS: {autocommit mode}
** METHOD: sqlite3
**
** ^The sqlite3_get_autocommit() interface returns non-zero or
** zero if the given database connection is or is not in autocommit mode,
................................................................................
#if defined(SQLITE_DEBUG) && !defined(SQLITE_TEST_REALLOC_STRESS)
SQLITE_PRIVATE   void sqlite3VdbeVerifyNoMallocRequired(Vdbe *p, int N);
SQLITE_PRIVATE   void sqlite3VdbeVerifyNoResultRow(Vdbe *p);
#else
# define sqlite3VdbeVerifyNoMallocRequired(A,B)
# define sqlite3VdbeVerifyNoResultRow(A)
#endif
SQLITE_PRIVATE VdbeOp *sqlite3VdbeAddOpList(Vdbe*, int nOp, VdbeOpList const *aOp, int iLineno);












SQLITE_PRIVATE void sqlite3VdbeAddParseSchemaOp(Vdbe*,int,char*);
SQLITE_PRIVATE void sqlite3VdbeChangeOpcode(Vdbe*, u32 addr, u8);
SQLITE_PRIVATE void sqlite3VdbeChangeP1(Vdbe*, u32 addr, int P1);
SQLITE_PRIVATE void sqlite3VdbeChangeP2(Vdbe*, u32 addr, int P2);
SQLITE_PRIVATE void sqlite3VdbeChangeP3(Vdbe*, u32 addr, int P3);
SQLITE_PRIVATE void sqlite3VdbeChangeP5(Vdbe*, u16 P5);
SQLITE_PRIVATE void sqlite3VdbeJumpHere(Vdbe*, int addr);
................................................................................
#define SQLITE_EnableTrigger  0x00040000  /* True to enable triggers */
#define SQLITE_DeferFKs       0x00080000  /* Defer all FK constraints */
#define SQLITE_QueryOnly      0x00100000  /* Disable database changes */
#define SQLITE_CellSizeCk     0x00200000  /* Check btree cell sizes on load */
#define SQLITE_Fts3Tokenizer  0x00400000  /* Enable fts3_tokenizer(2) */
#define SQLITE_EnableQPSG     0x00800000  /* Query Planner Stability Guarantee*/
#define SQLITE_TriggerEQP     0x01000000  /* Show trigger EXPLAIN QUERY PLAN */


/* Flags used only if debugging */
#ifdef SQLITE_DEBUG
#define SQLITE_SqlTrace       0x08000000  /* Debug print SQL as it executes */
#define SQLITE_VdbeListing    0x10000000  /* Debug listings of VDBE programs */
#define SQLITE_VdbeTrace      0x20000000  /* True to trace VDBE execution */
#define SQLITE_VdbeAddopTrace 0x40000000  /* Trace sqlite3VdbeAddOp() calls */
................................................................................
      unsigned notIndexed :1;    /* True if there is a NOT INDEXED clause */
      unsigned isIndexedBy :1;   /* True if there is an INDEXED BY clause */
      unsigned isTabFunc :1;     /* True if table-valued-function syntax */
      unsigned isCorrelated :1;  /* True if sub-query is correlated */
      unsigned viaCoroutine :1;  /* Implemented as a co-routine */
      unsigned isRecursive :1;   /* True for recursive reference in WITH */
    } fg;
#ifndef SQLITE_OMIT_EXPLAIN
    u8 iSelectId;     /* If pSelect!=0, the id of the sub-select in EQP */
#endif
    int iCursor;      /* The VDBE cursor number used to access this table */
    Expr *pOn;        /* The ON clause of a join */
    IdList *pUsing;   /* The USING clause of a join */
    Bitmask colUsed;  /* Bit N (1<<N) set if column N of pTab is used */
    union {
      char *zIndexedBy;    /* Identifier from "INDEXED BY <zIndex>" clause */
      ExprList *pFuncArg;  /* Arguments to table-valued-function */
................................................................................
  int iIdxCur;              /* Index of the first index cursor */
};

/*
** An instance of the following structure contains all information
** needed to generate code for a single SELECT statement.
**
** nLimit is set to -1 if there is no LIMIT clause.  nOffset is set to 0.
** If there is a LIMIT clause, the parser sets nLimit to the value of the
** limit and nOffset to the value of the offset (or 0 if there is not
** offset).  But later on, nLimit and nOffset become the memory locations
** in the VDBE that record the limit and offset counters.
**
** addrOpenEphm[] entries contain the address of OP_OpenEphemeral opcodes.
** These addresses must be stored so that we can go back and fill in
** the P4_KEYINFO and P2 parameters later.  Neither the KeyInfo nor
** the number of columns in P2 can be computed at the same time
** as the OP_OpenEphm instruction is coded because not
** enough information about the compound query is known at that point.
................................................................................
  ExprList *pEList;      /* The fields of the result */
  u8 op;                 /* One of: TK_UNION TK_ALL TK_INTERSECT TK_EXCEPT */
  LogEst nSelectRow;     /* Estimated number of result rows */
  u32 selFlags;          /* Various SF_* values */
  int iLimit, iOffset;   /* Memory registers holding LIMIT & OFFSET counters */
#if SELECTTRACE_ENABLED
  char zSelName[12];     /* Symbolic name of this SELECT use for debugging */
  u32 iSelectId;         /* EXPLAIN QUERY PLAN select ID */
#endif
  int addrOpenEphm[2];   /* OP_OpenEphem opcodes related to this select */
  SrcList *pSrc;         /* The FROM clause */
  Expr *pWhere;          /* The WHERE clause */
  ExprList *pGroupBy;    /* The GROUP BY clause */
  Expr *pHaving;         /* The HAVING clause */
  ExprList *pOrderBy;    /* The ORDER BY clause */
................................................................................
#define SF_NestedFrom     0x00800  /* Part of a parenthesized FROM clause */
#define SF_MinMaxAgg      0x01000  /* Aggregate containing min() or max() */
#define SF_Recursive      0x02000  /* The recursive part of a recursive CTE */
#define SF_FixedLimit     0x04000  /* nSelectRow set by a constant LIMIT */
#define SF_MaybeConvert   0x08000  /* Need convertCompoundSelectToSubquery() */
#define SF_Converted      0x10000  /* By convertCompoundSelectToSubquery() */
#define SF_IncludeHidden  0x20000  /* Include hidden columns in output */
#define SF_ComplexResult  0x40000  /* Result set contains subquery or function */


/*
** The results of a SELECT can be distributed in several ways, as defined
** by one of the following macros.  The "SRT" prefix means "SELECT Result
** Type".
**
**     SRT_Union       Store results as a key in a temporary index
................................................................................
  u8 explain;               /* True if the EXPLAIN flag is found on the query */
#ifndef SQLITE_OMIT_VIRTUALTABLE
  u8 declareVtab;           /* True if inside sqlite3_declare_vtab() */
  int nVtabLock;            /* Number of virtual tables to lock */
#endif
  int nHeight;              /* Expression tree height of current sub-select */
#ifndef SQLITE_OMIT_EXPLAIN
  int iSelectId;            /* ID of current select for EXPLAIN output */
  int iNextSelectId;        /* Next available select ID for EXPLAIN output */
#endif
  VList *pVList;            /* Mapping between variable names and numbers */
  Vdbe *pReprepare;         /* VM being reprepared (sqlite3Reprepare()) */
  const char *zTail;        /* All SQL text past the last semicolon parsed */
  Table *pNewTable;         /* A table being constructed by CREATE TABLE */
  Trigger *pNewTrigger;     /* Trigger under construct by a CREATE TRIGGER */
  const char *zAuthContext; /* The 6th parameter to db->xAuth callbacks */
................................................................................
    sqlite3TreeViewWith(pView, p->pWith, 1);
    cnt = 1;
    sqlite3TreeViewPush(pView, 1);
  }
  do{
#if SELECTTRACE_ENABLED
    sqlite3TreeViewLine(pView,
      "SELECT%s%s (%s/%d/%p) selFlags=0x%x nSelectRow=%d",
      ((p->selFlags & SF_Distinct) ? " DISTINCT" : ""),
      ((p->selFlags & SF_Aggregate) ? " agg_flag" : ""),
      p->zSelName, p->iSelectId, p, p->selFlags,
      (int)p->nSelectRow
    );
#else
    sqlite3TreeViewLine(pView, "SELECT%s%s (0x%p) selFlags=0x%x nSelectRow=%d",
      ((p->selFlags & SF_Distinct) ? " DISTINCT" : ""),
      ((p->selFlags & SF_Aggregate) ? " agg_flag" : ""), p, p->selFlags,
      (int)p->nSelectRow
................................................................................
/*
 * The size of the buffer used by sqlite3_win32_write_debug().
 */
#ifndef SQLITE_WIN32_DBG_BUF_SIZE
#  define SQLITE_WIN32_DBG_BUF_SIZE   ((int)(4096-sizeof(DWORD)))
#endif

/*
 * The value used with sqlite3_win32_set_directory() to specify that
 * the data directory should be changed.
 */
#ifndef SQLITE_WIN32_DATA_DIRECTORY_TYPE
#  define SQLITE_WIN32_DATA_DIRECTORY_TYPE (1)
#endif

/*
 * The value used with sqlite3_win32_set_directory() to specify that
 * the temporary directory should be changed.
 */
#ifndef SQLITE_WIN32_TEMP_DIRECTORY_TYPE
#  define SQLITE_WIN32_TEMP_DIRECTORY_TYPE (2)
#endif

/*
 * If compiled with SQLITE_WIN32_MALLOC on Windows, we will use the
 * various Win32 API heap functions instead of our own.
 */
#ifdef SQLITE_WIN32_MALLOC

/*
................................................................................
#ifndef SQLITE_OMIT_AUTOINIT
  if( sqlite3_initialize() ) return 0;
#endif
  return winUtf8ToMbcs(zText, useAnsi);
}

/*
** This function sets the data directory or the temporary directory based on
** the provided arguments.  The type argument must be 1 in order to set the
** data directory or 2 in order to set the temporary directory.  The zValue
** argument is the name of the directory to use.  The return value will be
** SQLITE_OK if successful.
*/
SQLITE_API int sqlite3_win32_set_directory(DWORD type, LPCWSTR zValue){
  char **ppDirectory = 0;
#ifndef SQLITE_OMIT_AUTOINIT
  int rc = sqlite3_initialize();
  if( rc ) return rc;
#endif
  if( type==SQLITE_WIN32_DATA_DIRECTORY_TYPE ){
    ppDirectory = &sqlite3_data_directory;
................................................................................
    ppDirectory = &sqlite3_temp_directory;
  }
  assert( !ppDirectory || type==SQLITE_WIN32_DATA_DIRECTORY_TYPE
          || type==SQLITE_WIN32_TEMP_DIRECTORY_TYPE
  );
  assert( !ppDirectory || sqlite3MemdebugHasType(*ppDirectory, MEMTYPE_HEAP) );
  if( ppDirectory ){
    char *zValueUtf8 = 0;
    if( zValue && zValue[0] ){
      zValueUtf8 = winUnicodeToUtf8(zValue);
      if ( zValueUtf8==0 ){
        return SQLITE_NOMEM_BKPT;
      }
    }
    sqlite3_free(*ppDirectory);
    *ppDirectory = zValueUtf8;
    return SQLITE_OK;
  }
  return SQLITE_ERROR;
}


































/*
** The return value of winGetLastErrorMsg
** is zero if the error message fits in the buffer, or non-zero
** otherwise (if the message was truncated).
*/
static int winGetLastErrorMsg(DWORD lastErrno, int nBuf, char *zBuf){
................................................................................
          pDb->safety_level | (db->flags & PAGER_FLAGS_MASK));
    }
  }
}
#else
# define setDefaultSyncFlag(pBt,safety_level)
#endif





/*
** Get a reference to pPage1 of the database file.  This will
** also acquire a readlock on that file.
**
** SQLITE_OK is returned on success.  If the file is not a
** well-formed database file, then SQLITE_CORRUPT is returned.
................................................................................
  /* Do some checking to help insure the file we opened really is
  ** a valid database file. 
  */
  nPage = nPageHeader = get4byte(28+(u8*)pPage1->aData);
  sqlite3PagerPagecount(pBt->pPager, &nPageFile);
  if( nPage==0 || memcmp(24+(u8*)pPage1->aData, 92+(u8*)pPage1->aData,4)!=0 ){
    nPage = nPageFile;



  }
  if( nPage>0 ){
    u32 pageSize;
    u32 usableSize;
    u8 *page1 = pPage1->aData;
    rc = SQLITE_NOTADB;
    /* EVIDENCE-OF: R-43737-39999 Every valid SQLite database file begins
................................................................................
  u32 ovflPageSize;

  assert( sqlite3_mutex_held(pPage->pBt->mutex) );
  pPage->xParseCell(pPage, pCell, pInfo);
  if( pInfo->nLocal==pInfo->nPayload ){
    return SQLITE_OK;  /* No overflow pages. Return without doing anything */
  }
  if( pCell+pInfo->nSize-1 > pPage->aData+pPage->maskPage ){


    /* Cell extends past end of page */
    return SQLITE_CORRUPT_PAGE(pPage);
  }
  ovflPgno = get4byte(pCell + pInfo->nSize - 4);
  pBt = pPage->pBt;
  assert( pBt->usableSize > 4 );
  ovflPageSize = pBt->usableSize - 4;
................................................................................
  int p4type          /* P4 operand type */
){
  char *p4copy = sqlite3DbMallocRawNN(sqlite3VdbeDb(p), 8);
  if( p4copy ) memcpy(p4copy, zP4, 8);
  return sqlite3VdbeAddOp4(p, op, p1, p2, p3, p4copy, p4type);
}












































/*
** Add an OP_ParseSchema opcode.  This routine is broken out from
** sqlite3VdbeAddOp4() since it needs to also needs to mark all btrees
** as having been used.
**
** The zWhere string must have been obtained from sqlite3_malloc().
** This routine will take ownership of the allocated memory.
................................................................................
            if( aiMap ) aiMap[i] = j;
          }
  
          assert( i==nExpr || colUsed!=(MASKBIT(nExpr)-1) );
          if( colUsed==(MASKBIT(nExpr)-1) ){
            /* If we reach this point, that means the index pIdx is usable */
            int iAddr = sqlite3VdbeAddOp0(v, OP_Once); VdbeCoverage(v);
#ifndef SQLITE_OMIT_EXPLAIN
            sqlite3VdbeAddOp4(v, OP_Explain, 0, 0, 0,
              sqlite3MPrintf(db, "USING INDEX %s FOR IN-OPERATOR",pIdx->zName),
              P4_DYNAMIC);
#endif
            sqlite3VdbeAddOp3(v, OP_OpenRead, iTab, pIdx->tnum, iDb);
            sqlite3VdbeSetP4KeyInfo(pParse, pIdx);
            VdbeComment((v, "%s", pIdx->zName));
            assert( IN_INDEX_INDEX_DESC == IN_INDEX_INDEX_ASC+1 );
            eType = IN_INDEX_INDEX_ASC + pIdx->aSortOrder[0];
  
            if( prRhsHasNull ){
................................................................................
        **
        ** Generate code to write the results of the select into the temporary
        ** table allocated and opened above.
        */
        Select *pSelect = pExpr->x.pSelect;
        ExprList *pEList = pSelect->pEList;

#ifndef SQLITE_OMIT_EXPLAIN
        if( pParse->explain==2 ){
          char *zMsg = sqlite3MPrintf(pParse->db, "EXECUTE %sLIST SUBQUERY %d",
            jmpIfDynamic>=0?"":"CORRELATED ",
            pParse->iNextSelectId
          );
          sqlite3VdbeAddOp4(v, OP_Explain, pParse->iSelectId, 0, 0, zMsg,
                            P4_DYNAMIC);
        }
#endif

        assert( !isRowid );
        /* If the LHS and RHS of the IN operator do not match, that
        ** error will have been caught long before we reach this point. */
        if( ALWAYS(pEList->nExpr==nVal) ){
          SelectDest dest;
          int i;
          sqlite3SelectDestInit(&dest, SRT_Set, pExpr->iTable);
................................................................................
      Expr *pLimit;                         /* New limit expression */

      testcase( pExpr->op==TK_EXISTS );
      testcase( pExpr->op==TK_SELECT );
      assert( pExpr->op==TK_EXISTS || pExpr->op==TK_SELECT );
      assert( ExprHasProperty(pExpr, EP_xIsSelect) );

#ifndef SQLITE_OMIT_EXPLAIN
      if( pParse->explain==2 ){
        char *zMsg = sqlite3MPrintf(pParse->db, "EXECUTE %sSCALAR SUBQUERY %d",
            jmpIfDynamic>=0?"":"CORRELATED ",
            pParse->iNextSelectId
        );
        sqlite3VdbeAddOp4(v, OP_Explain, pParse->iSelectId, 0, 0, zMsg,
                          P4_DYNAMIC);
      }
#endif

      pSel = pExpr->x.pSelect;
      nReg = pExpr->op==TK_SELECT ? pSel->pEList->nExpr : 1;
      sqlite3SelectDestInit(&dest, 0, pParse->nMem+1);
      pParse->nMem += nReg;
      if( pExpr->op==TK_SELECT ){
        dest.eDest = SRT_Mem;
        dest.iSdst = dest.iSDParm;
        dest.nSdst = nReg;
................................................................................

  assert( target>0 && target<=pParse->nMem );
  if( v==0 ){
    assert( pParse->db->mallocFailed );
    return 0;
  }


  if( pExpr==0 ){
    op = TK_NULL;
  }else{
    op = pExpr->op;
  }
  switch( op ){
    case TK_AGG_COLUMN: {
................................................................................
    case TK_BETWEEN: {
      exprCodeBetween(pParse, pExpr, target, 0, 0);
      return target;
    }
    case TK_SPAN:
    case TK_COLLATE: 
    case TK_UPLUS: {
      return sqlite3ExprCodeTarget(pParse, pExpr->pLeft, target);

    }

    case TK_TRIGGER: {
      /* If the opcode is TK_TRIGGER, then the expression is a reference
      ** to a column in the new.* or old.* pseudo-tables available to
      ** trigger programs. In this case Expr.iTable is set to 1 for the
      ** new.* pseudo-table, or 0 for the old.* pseudo-table. Expr.iColumn
................................................................................
  assert( pTab!=0 );
  assert( pParse->nErr==0 );
  if( sqlite3StrNICmp(pTab->zName, "sqlite_", 7)==0 
       && db->init.busy==0
#if SQLITE_USER_AUTHENTICATION
       && sqlite3UserAuthTable(pTab->zName)==0
#endif



       && sqlite3StrNICmp(&pTab->zName[7],"altertab_",9)!=0 ){

    sqlite3ErrorMsg(pParse, "table %s may not be indexed", pTab->zName);
    goto exit_create_index;
  }
#ifndef SQLITE_OMIT_VIEW
  if( pTab->pSelect ){
    sqlite3ErrorMsg(pParse, "views may not be indexed");
    goto exit_create_index;
................................................................................
  **    meta[9]   unused
  **
  ** Note: The #defined SQLITE_UTF* symbols in sqliteInt.h correspond to
  ** the possible values of meta[4].
  */
  for(i=0; i<ArraySize(meta); i++){
    sqlite3BtreeGetMeta(pDb->pBt, i+1, (u32 *)&meta[i]);



  }
  pDb->pSchema->schema_cookie = meta[BTREE_SCHEMA_VERSION-1];

  /* If opening a non-empty database, check the text encoding. For the
  ** main database, set sqlite3.enc to the encoding of the main database.
  ** For an attached db, it is an error if the encoding is not the same
  ** as sqlite3.enc.
................................................................................
  }
  rc = sParse.rc;

#ifndef SQLITE_OMIT_EXPLAIN
  if( rc==SQLITE_OK && sParse.pVdbe && sParse.explain ){
    static const char * const azColName[] = {
       "addr", "opcode", "p1", "p2", "p3", "p4", "p5", "comment",
       "selectid", "order", "from", "detail"
    };
    int iFirst, mx;
    if( sParse.explain==2 ){
      sqlite3VdbeSetNumCols(sParse.pVdbe, 4);
      iFirst = 8;
      mx = 12;
    }else{
................................................................................
/*
** Trace output macros
*/
#if SELECTTRACE_ENABLED
/***/ int sqlite3SelectTrace = 0;
# define SELECTTRACE(K,P,S,X)  \
  if(sqlite3SelectTrace&(K))   \
    sqlite3DebugPrintf("%s/%d/%p: ",(S)->zSelName,(P)->iSelectId,(S)),\
    sqlite3DebugPrintf X
#else
# define SELECTTRACE(K,P,S,X)
#endif


/*
................................................................................
  u8 nDefer;            /* Number of valid entries in aDefer[] */
  struct DeferredCsr {
    Table *pTab;        /* Table definition */
    int iCsr;           /* Cursor number for table */
    int nKey;           /* Number of PK columns for table pTab (>=1) */
  } aDefer[4];
#endif

};
#define SORTFLAG_UseSorter  0x01   /* Use SorterOpen instead of OpenEphemeral */

/*
** Delete all the content of a Select structure.  Deallocate the structure
** itself only if bFree is true.
*/
................................................................................
/* Forward reference */
static KeyInfo *keyInfoFromExprList(
  Parse *pParse,       /* Parsing context */
  ExprList *pList,     /* Form the KeyInfo object from this ExprList */
  int iStart,          /* Begin with this column of pList */
  int nExtra           /* Add this many extra columns to the end */
);

























































/*
** Generate code that will push the record in registers regData
** through regData+nData-1 onto the sorter.
*/
static void pushOntoSorter(
  Parse *pParse,         /* Parser context */
  SortCtx *pSort,        /* Information about the ORDER BY clause */
  Select *pSelect,       /* The whole SELECT statement */
  int regData,           /* First register holding data to be sorted */
  int regOrigData,       /* First register holding data before packing */
  int nData,             /* Number of elements in the data array */
  int nPrefixReg         /* No. of reg prior to regData available for use */
){
  Vdbe *v = pParse->pVdbe;                         /* Stmt under construction */
  int bSeq = ((pSort->sortFlags & SORTFLAG_UseSorter)==0);
  int nExpr = pSort->pOrderBy->nExpr;              /* No. of ORDER BY terms */
  int nBase = nExpr + bSeq + nData;                /* Fields in sorter record */
  int regBase;                                     /* Regs for sorter record */
  int regRecord = ++pParse->nMem;                  /* Assembled sorter record */
  int nOBSat = pSort->nOBSat;                      /* ORDER BY terms to skip */
  int op;                            /* Opcode to add sorter record to sorter */
  int iLimit;                        /* LIMIT counter */


  assert( bSeq==0 || bSeq==1 );













  assert( nData==1 || regData==regOrigData || regOrigData==0 );

  if( nPrefixReg ){
    assert( nPrefixReg==nExpr+bSeq );
    regBase = regData - nExpr - bSeq;
  }else{
    regBase = pParse->nMem + 1;
    pParse->nMem += nBase;
  }
  assert( pSelect->iOffset==0 || pSelect->iLimit!=0 );
  iLimit = pSelect->iOffset ? pSelect->iOffset+1 : pSelect->iLimit;
  pSort->labelDone = sqlite3VdbeMakeLabel(v);
................................................................................
    int regPrevKey;   /* The first nOBSat columns of the previous row */
    int addrFirst;    /* Address of the OP_IfNot opcode */
    int addrJmp;      /* Address of the OP_Jump opcode */
    VdbeOp *pOp;      /* Opcode that opens the sorter */
    int nKey;         /* Number of sorting key columns, including OP_Sequence */
    KeyInfo *pKI;     /* Original KeyInfo on the sorter table */

    sqlite3VdbeAddOp3(v, OP_MakeRecord, regBase+nOBSat, nBase-nOBSat,regRecord);
    regPrevKey = pParse->nMem+1;
    pParse->nMem += pSort->nOBSat;
    nKey = nExpr - pSort->nOBSat + bSeq;
    if( bSeq ){
      addrFirst = sqlite3VdbeAddOp1(v, OP_IfNot, regBase+nExpr); 
    }else{
      addrFirst = sqlite3VdbeAddOp1(v, OP_SequenceTest, pSort->iECursor);
................................................................................
    ** If the new record does not need to be inserted into the sorter,
    ** jump to the next iteration of the loop. Or, if the
    ** pSort->bOrderedInnerLoop flag is set to indicate that the inner
    ** loop delivers items in sorted order, jump to the next iteration
    ** of the outer loop.
    */
    int iCsr = pSort->iECursor;
    int iJmp = sqlite3VdbeCurrentAddr(v)+5+(nOBSat<=0)+pSort->bOrderedInnerLoop;
    assert( pSort->bOrderedInnerLoop==0 || pSort->bOrderedInnerLoop==1 );
    sqlite3VdbeAddOp2(v, OP_IfNotZero, iLimit, sqlite3VdbeCurrentAddr(v)+4);
    VdbeCoverage(v);
    sqlite3VdbeAddOp2(v, OP_Last, iCsr, 0);
    sqlite3VdbeAddOp4Int(v, OP_IdxLE, iCsr, iJmp, regBase+nOBSat, nExpr-nOBSat);

    VdbeCoverage(v);
    sqlite3VdbeAddOp1(v, OP_Delete, iCsr);
  }
  if( nOBSat<=0 ){
    sqlite3VdbeAddOp3(v, OP_MakeRecord, regBase+nOBSat, nBase-nOBSat,regRecord);
  }
  if( pSort->sortFlags & SORTFLAG_UseSorter ){
    op = OP_SorterInsert;
  }else{
    op = OP_IdxInsert;
  }
  sqlite3VdbeAddOp4Int(v, op, pSort->iECursor, regRecord,
                       regBase+nOBSat, nBase-nOBSat);





}

/*
** Add code to implement the OFFSET
*/
static void codeOffset(
  Vdbe *v,          /* Generate code into this VM */
................................................................................
  for(i=0; i<pEList->nExpr; i++){
    struct ExprList_item *pItem = &pEList->a[i];
    if( pItem->u.x.iOrderByCol==0 ){
      Expr *pExpr = pItem->pExpr;
      Table *pTab = pExpr->pTab;
      if( pExpr->op==TK_COLUMN && pTab && !IsVirtual(pTab)
       && (pTab->aCol[pExpr->iColumn].colFlags & COLFLAG_SORTERREF)
#if 0
          && pTab->pSchema && pTab->pSelect==0 && !IsVirtual(pTab)
#endif
      ){
        int j;
        for(j=0; j<nDefer; j++){
          if( pSort->aDefer[j].iCsr==pExpr->iTable ) break;
        }
        if( j==nDefer ){
          if( nDefer==ArraySize(pSort->aDefer) ){
................................................................................
  Vdbe *v = pParse->pVdbe;
  int i;
  int hasDistinct;            /* True if the DISTINCT keyword is present */
  int eDest = pDest->eDest;   /* How to dispose of results */
  int iParm = pDest->iSDParm; /* First argument to disposal method */
  int nResultCol;             /* Number of result columns */
  int nPrefixReg = 0;         /* Number of extra registers before regResult */


  /* Usually, regResult is the first cell in an array of memory cells
  ** containing the current result row. In this case regOrig is set to the
  ** same value. However, if the results are being sent to the sorter, the
  ** values for any expressions that are also part of the sort-key are omitted
  ** from this array. In this case regOrig is set to zero.  */
  int regResult;              /* Start of memory holding current results */
................................................................................
  }else if( eDest!=SRT_Exists ){
#ifdef SQLITE_ENABLE_SORTER_REFERENCES
    ExprList *pExtra = 0;
#endif
    /* If the destination is an EXISTS(...) expression, the actual
    ** values returned by the SELECT are not required.
    */
    u8 ecelFlags;

    if( eDest==SRT_Mem || eDest==SRT_Output || eDest==SRT_Coroutine ){
      ecelFlags = SQLITE_ECEL_DUP;
    }else{
      ecelFlags = 0;
    }
    if( pSort && hasDistinct==0 && eDest!=SRT_EphemTab && eDest!=SRT_Table ){
      /* For each expression in p->pEList that is a copy of an expression in
      ** the ORDER BY clause (pSort->pOrderBy), set the associated 
      ** iOrderByCol value to one more than the index of the ORDER BY 
      ** expression within the sort-key that pushOntoSorter() will generate.
      ** This allows the p->pEList field to be omitted from the sorted record,
      ** saving space and CPU cycles.  */
      ecelFlags |= (SQLITE_ECEL_OMITREF|SQLITE_ECEL_REF);

      for(i=pSort->nOBSat; i<pSort->pOrderBy->nExpr; i++){
        int j;
        if( (j = pSort->pOrderBy->a[i].u.x.iOrderByCol)>0 ){
          p->pEList->a[j-1].u.x.iOrderByCol = i+1-pSort->nOBSat;
        }
      }
#ifdef SQLITE_ENABLE_SORTER_REFERENCES
................................................................................
        ** composite primary keys in the SortCtx.aDefer[] array.  */
        VdbeOp *pOp = sqlite3VdbeGetOp(v, pSort->addrSortIndex);
        pOp->p2 += (pExtra->nExpr - pSort->nDefer);
        pOp->p4.pKeyInfo->nAllField += (pExtra->nExpr - pSort->nDefer);
        pParse->nMem += pExtra->nExpr;
      }
#endif











      regOrig = 0;








      assert( eDest==SRT_Set || eDest==SRT_Mem 
           || eDest==SRT_Coroutine || eDest==SRT_Output );
    }
    nResultCol = sqlite3ExprCodeExprList(pParse,p->pEList,regResult,

                                         0,ecelFlags);
#ifdef SQLITE_ENABLE_SORTER_REFERENCES


    if( pExtra ){
      nResultCol += sqlite3ExprCodeExprList(
          pParse, pExtra, regResult + nResultCol, 0, 0




      );
      sqlite3ExprListDelete(pParse->db, pExtra);





    }
#endif
  }

  /* If the DISTINCT keyword was present on the SELECT statement
  ** and this row has been seen before, then do not make this row
  ** part of the result.
  */
  if( hasDistinct ){
................................................................................
        sqlite3VdbeAddOp4Int(v, OP_Found, iParm+1, addr, r1, 0);
        VdbeCoverage(v);
        sqlite3VdbeAddOp4Int(v, OP_IdxInsert, iParm+1, r1,regResult,nResultCol);
        assert( pSort==0 );
      }
#endif
      if( pSort ){

        pushOntoSorter(pParse, pSort, p, r1+nPrefixReg,regResult,1,nPrefixReg);
      }else{
        int r2 = sqlite3GetTempReg(pParse);
        sqlite3VdbeAddOp2(v, OP_NewRowid, iParm, r2);
        sqlite3VdbeAddOp3(v, OP_Insert, iParm, r1, r2);
        sqlite3VdbeChangeP5(v, OPFLAG_APPEND);
        sqlite3ReleaseTempReg(pParse, r2);
      }
................................................................................
**
**   "USE TEMP B-TREE FOR xxx"
**
** where xxx is one of "DISTINCT", "ORDER BY" or "GROUP BY". Exactly which
** is determined by the zUsage argument.
*/
static void explainTempTable(Parse *pParse, const char *zUsage){
  if( pParse->explain==2 ){
    Vdbe *v = pParse->pVdbe;
    char *zMsg = sqlite3MPrintf(pParse->db, "USE TEMP B-TREE FOR %s", zUsage);
    sqlite3VdbeAddOp4(v, OP_Explain, pParse->iSelectId, 0, 0, zMsg, P4_DYNAMIC);
  }
}

/*
** Assign expression b to lvalue a. A second, no-op, version of this macro
** is provided when SQLITE_OMIT_EXPLAIN is defined. This allows the code
** in sqlite3Select() to assign values to structure member variables that
** only exist if SQLITE_OMIT_EXPLAIN is not defined without polluting the
................................................................................

#else
/* No-op versions of the explainXXX() functions and macros. */
# define explainTempTable(y,z)
# define explainSetInteger(y,z)
#endif

#if !defined(SQLITE_OMIT_EXPLAIN) && !defined(SQLITE_OMIT_COMPOUND_SELECT)
/*
** Unless an "EXPLAIN QUERY PLAN" command is being processed, this function
** is a no-op. Otherwise, it adds a single row of output to the EQP result,
** where the caption is of one of the two forms:
**
**   "COMPOSITE SUBQUERIES iSub1 and iSub2 (op)"
**   "COMPOSITE SUBQUERIES iSub1 and iSub2 USING TEMP B-TREE (op)"
**
** where iSub1 and iSub2 are the integers passed as the corresponding
** function parameters, and op is the text representation of the parameter
** of the same name. The parameter "op" must be one of TK_UNION, TK_EXCEPT,
** TK_INTERSECT or TK_ALL. The first form is used if argument bUseTmp is 
** false, or the second form if it is true.
*/
static void explainComposite(
  Parse *pParse,                  /* Parse context */
  int op,                         /* One of TK_UNION, TK_EXCEPT etc. */
  int iSub1,                      /* Subquery id 1 */
  int iSub2,                      /* Subquery id 2 */
  int bUseTmp                     /* True if a temp table was used */
){
  assert( op==TK_UNION || op==TK_EXCEPT || op==TK_INTERSECT || op==TK_ALL );
  if( pParse->explain==2 ){
    Vdbe *v = pParse->pVdbe;
    char *zMsg = sqlite3MPrintf(
        pParse->db, "COMPOUND SUBQUERIES %d AND %d %s(%s)", iSub1, iSub2,
        bUseTmp?"USING TEMP B-TREE ":"", selectOpName(op)
    );
    sqlite3VdbeAddOp4(v, OP_Explain, pParse->iSelectId, 0, 0, zMsg, P4_DYNAMIC);
  }
}
#else
/* No-op versions of the explainXXX() functions and macros. */
# define explainComposite(v,w,x,y,z)
#endif

/*
** If the inner loop was generated using a non-null pOrderBy argument,
** then the results were placed in a sorter.  After the loop is terminated
** we need to run the sorter and output the results.  The following
** routine generates the code needed to do that.
*/
................................................................................
#ifndef SQLITE_OMIT_EXPLAIN
  /* If this is an EXPLAIN, skip this step */
  if( pParse->explain ){
    return;
  }
#endif

  if( pParse->colNamesSet || db->mallocFailed ) return;
  /* Column names are determined by the left-most term of a compound select */
  while( pSelect->pPrior ) pSelect = pSelect->pPrior;
  SELECTTRACE(1,pParse,pSelect,("generating column names\n"));
  pTabList = pSelect->pSrc;
  pEList = pSelect->pEList;
  assert( v!=0 );
  assert( pTabList!=0 );
................................................................................
  }

  /* Detach the ORDER BY clause from the compound SELECT */
  p->pOrderBy = 0;

  /* Store the results of the setup-query in Queue. */
  pSetup->pNext = 0;

  rc = sqlite3Select(pParse, pSetup, &destQueue);
  pSetup->pNext = p;
  if( rc ) goto end_of_recursive_query;

  /* Find the next row in the Queue and output that row */
  addrTop = sqlite3VdbeAddOp2(v, OP_Rewind, iQueue, addrBreak); VdbeCoverage(v);

................................................................................
  /* Execute the recursive SELECT taking the single row in Current as
  ** the value for the recursive-table. Store the results in the Queue.
  */
  if( p->selFlags & SF_Aggregate ){
    sqlite3ErrorMsg(pParse, "recursive aggregate queries not supported");
  }else{
    p->pPrior = 0;

    sqlite3Select(pParse, p, &destQueue);
    assert( p->pPrior==0 );
    p->pPrior = pSetup;
  }

  /* Keep running the loop until the Queue is empty */
  sqlite3VdbeGoto(v, addrTop);
................................................................................
** Since the limit is exactly 1, we only need to evalutes the left-most VALUES.
*/
static int multiSelectValues(
  Parse *pParse,        /* Parsing context */
  Select *p,            /* The right-most of SELECTs to be coded */
  SelectDest *pDest     /* What to do with query results */
){
  Select *pPrior;
  Select *pRightmost = p;
  int nRow = 1;
  int rc = 0;

  assert( p->selFlags & SF_MultiValue );
  do{
    assert( p->selFlags & SF_Values );
    assert( p->op==TK_ALL || (p->op==TK_SELECT && p->pPrior==0) );
    assert( p->pNext==0 || p->pEList->nExpr==p->pNext->pEList->nExpr );
    if( p->pPrior==0 ) break;
    assert( p->pPrior->pNext==p );
    p = p->pPrior;
    nRow++;
  }while(1);


  while( p ){
    pPrior = p->pPrior;
    p->pPrior = 0;
    rc = sqlite3Select(pParse, p, pDest);
    p->pPrior = pPrior;
    if( rc || pRightmost->pLimit ) break;
    p->nSelectRow = nRow;
    p = p->pNext;
  }
  return rc;
}

/*
................................................................................
){
  int rc = SQLITE_OK;   /* Success code from a subroutine */
  Select *pPrior;       /* Another SELECT immediately to our left */
  Vdbe *v;              /* Generate code to this VDBE */
  SelectDest dest;      /* Alternative data destination */
  Select *pDelete = 0;  /* Chain of simple selects to delete */
  sqlite3 *db;          /* Database connection */
#ifndef SQLITE_OMIT_EXPLAIN
  int iSub1 = 0;        /* EQP id of left-hand query */
  int iSub2 = 0;        /* EQP id of right-hand query */
#endif

  /* Make sure there is no ORDER BY or LIMIT clause on prior SELECTs.  Only
  ** the last (right-most) SELECT in the series may have an ORDER BY or LIMIT.
  */
  assert( p && p->pPrior );  /* Calling function guarantees this much */
  assert( (p->selFlags & SF_Recursive)==0 || p->op==TK_ALL || p->op==TK_UNION );
  db = pParse->db;
................................................................................
  }else
#endif

  /* Compound SELECTs that have an ORDER BY clause are handled separately.
  */
  if( p->pOrderBy ){
    return multiSelectOrderBy(pParse, p, pDest);
  }else








  /* Generate code for the left and right SELECT statements.
  */
  switch( p->op ){
    case TK_ALL: {
      int addr = 0;
      int nLimit;
      assert( !pPrior->pLimit );
      pPrior->iLimit = p->iLimit;
      pPrior->iOffset = p->iOffset;
      pPrior->pLimit = p->pLimit;
      explainSetInteger(iSub1, pParse->iNextSelectId);
      rc = sqlite3Select(pParse, pPrior, &dest);
      p->pLimit = 0;
      if( rc ){
        goto multi_select_end;
      }
      p->pPrior = 0;
      p->iLimit = pPrior->iLimit;
      p->iOffset = pPrior->iOffset;
      if( p->iLimit ){
        addr = sqlite3VdbeAddOp1(v, OP_IfNot, p->iLimit); VdbeCoverage(v);
        VdbeComment((v, "Jump ahead if LIMIT reached"));
        if( p->iOffset ){
          sqlite3VdbeAddOp3(v, OP_OffsetLimit,
                            p->iLimit, p->iOffset+1, p->iOffset);
        }
      }
      explainSetInteger(iSub2, pParse->iNextSelectId);

      rc = sqlite3Select(pParse, p, &dest);
      testcase( rc!=SQLITE_OK );
      pDelete = p->pPrior;
      p->pPrior = pPrior;
      p->nSelectRow = sqlite3LogEstAdd(p->nSelectRow, pPrior->nSelectRow);
      if( pPrior->pLimit
       && sqlite3ExprIsInteger(pPrior->pLimit->pLeft, &nLimit)
       && nLimit>0 && p->nSelectRow > sqlite3LogEst((u64)nLimit) 
      ){
        p->nSelectRow = sqlite3LogEst((u64)nLimit);
      }
      if( addr ){
        sqlite3VdbeJumpHere(v, addr);
      }
      break;
    }
    case TK_EXCEPT:
    case TK_UNION: {
      int unionTab;    /* Cursor number of the temporary table holding result */
      u8 op = 0;       /* One of the SRT_ operations to apply to self */
      int priorOp;     /* The SRT_ operation to apply to prior selects */
      Expr *pLimit;    /* Saved values of p->nLimit  */
      int addr;
      SelectDest uniondest;

      testcase( p->op==TK_EXCEPT );
      testcase( p->op==TK_UNION );
      priorOp = SRT_Union;
      if( dest.eDest==priorOp ){
        /* We can reuse a temporary table generated by a SELECT to our
        ** right.
        */
        assert( p->pLimit==0 );      /* Not allowed on leftward elements */
        unionTab = dest.iSDParm;
      }else{
        /* We will need to create our own temporary table to hold the
        ** intermediate results.
        */
        unionTab = pParse->nTab++;
        assert( p->pOrderBy==0 );
        addr = sqlite3VdbeAddOp2(v, OP_OpenEphemeral, unionTab, 0);
        assert( p->addrOpenEphm[0] == -1 );
        p->addrOpenEphm[0] = addr;
        findRightmost(p)->selFlags |= SF_UsesEphemeral;
        assert( p->pEList );
      }

      /* Code the SELECT statements to our left
      */
      assert( !pPrior->pOrderBy );
      sqlite3SelectDestInit(&uniondest, priorOp, unionTab);
      explainSetInteger(iSub1, pParse->iNextSelectId);
      rc = sqlite3Select(pParse, pPrior, &uniondest);
      if( rc ){
        goto multi_select_end;
      }

      /* Code the current SELECT statement
      */
      if( p->op==TK_EXCEPT ){
        op = SRT_Except;
      }else{
        assert( p->op==TK_UNION );
        op = SRT_Union;
      }
      p->pPrior = 0;
      pLimit = p->pLimit;
      p->pLimit = 0;
      uniondest.eDest = op;
      explainSetInteger(iSub2, pParse->iNextSelectId);


      rc = sqlite3Select(pParse, p, &uniondest);
      testcase( rc!=SQLITE_OK );
      /* Query flattening in sqlite3Select() might refill p->pOrderBy.
      ** Be sure to delete p->pOrderBy, therefore, to avoid a memory leak. */
      sqlite3ExprListDelete(db, p->pOrderBy);
      pDelete = p->pPrior;
      p->pPrior = pPrior;
      p->pOrderBy = 0;
      if( p->op==TK_UNION ){
        p->nSelectRow = sqlite3LogEstAdd(p->nSelectRow, pPrior->nSelectRow);
      }
      sqlite3ExprDelete(db, p->pLimit);
      p->pLimit = pLimit;
      p->iLimit = 0;
      p->iOffset = 0;

      /* Convert the data in the temporary table into whatever form
      ** it is that we currently need.
      */
      assert( unionTab==dest.iSDParm || dest.eDest!=priorOp );
      if( dest.eDest!=priorOp ){
        int iCont, iBreak, iStart;
        assert( p->pEList );
        iBreak = sqlite3VdbeMakeLabel(v);
        iCont = sqlite3VdbeMakeLabel(v);
        computeLimitRegisters(pParse, p, iBreak);
        sqlite3VdbeAddOp2(v, OP_Rewind, unionTab, iBreak); VdbeCoverage(v);
        iStart = sqlite3VdbeCurrentAddr(v);
        selectInnerLoop(pParse, p, unionTab,
                        0, 0, &dest, iCont, iBreak);
        sqlite3VdbeResolveLabel(v, iCont);
        sqlite3VdbeAddOp2(v, OP_Next, unionTab, iStart); VdbeCoverage(v);
        sqlite3VdbeResolveLabel(v, iBreak);
        sqlite3VdbeAddOp2(v, OP_Close, unionTab, 0);
      }
      break;
    }
    default: assert( p->op==TK_INTERSECT ); {
      int tab1, tab2;
      int iCont, iBreak, iStart;
      Expr *pLimit;
      int addr;
      SelectDest intersectdest;
      int r1;

      /* INTERSECT is different from the others since it requires
      ** two temporary tables.  Hence it has its own case.  Begin
      ** by allocating the tables we will need.
      */
      tab1 = pParse->nTab++;
      tab2 = pParse->nTab++;
      assert( p->pOrderBy==0 );

      addr = sqlite3VdbeAddOp2(v, OP_OpenEphemeral, tab1, 0);
      assert( p->addrOpenEphm[0] == -1 );
      p->addrOpenEphm[0] = addr;
      findRightmost(p)->selFlags |= SF_UsesEphemeral;
      assert( p->pEList );

      /* Code the SELECTs to our left into temporary table "tab1".
      */
      sqlite3SelectDestInit(&intersectdest, SRT_Union, tab1);
      explainSetInteger(iSub1, pParse->iNextSelectId);
      rc = sqlite3Select(pParse, pPrior, &intersectdest);
      if( rc ){
        goto multi_select_end;
      }

      /* Code the current SELECT into temporary table "tab2"
      */
      addr = sqlite3VdbeAddOp2(v, OP_OpenEphemeral, tab2, 0);
      assert( p->addrOpenEphm[1] == -1 );
      p->addrOpenEphm[1] = addr;
      p->pPrior = 0;
      pLimit = p->pLimit;
      p->pLimit = 0;
      intersectdest.iSDParm = tab2;
      explainSetInteger(iSub2, pParse->iNextSelectId);


      rc = sqlite3Select(pParse, p, &intersectdest);
      testcase( rc!=SQLITE_OK );
      pDelete = p->pPrior;
      p->pPrior = pPrior;
      if( p->nSelectRow>pPrior->nSelectRow ) p->nSelectRow = pPrior->nSelectRow;


      sqlite3ExprDelete(db, p->pLimit);
      p->pLimit = pLimit;

      /* Generate code to take the intersection of the two temporary
      ** tables.
      */
      assert( p->pEList );
      iBreak = sqlite3VdbeMakeLabel(v);
      iCont = sqlite3VdbeMakeLabel(v);
      computeLimitRegisters(pParse, p, iBreak);
      sqlite3VdbeAddOp2(v, OP_Rewind, tab1, iBreak); VdbeCoverage(v);
      r1 = sqlite3GetTempReg(pParse);
      iStart = sqlite3VdbeAddOp2(v, OP_RowData, tab1, r1);
      sqlite3VdbeAddOp4Int(v, OP_NotFound, tab2, iCont, r1, 0); VdbeCoverage(v);

      sqlite3ReleaseTempReg(pParse, r1);
      selectInnerLoop(pParse, p, tab1,
                      0, 0, &dest, iCont, iBreak);
      sqlite3VdbeResolveLabel(v, iCont);
      sqlite3VdbeAddOp2(v, OP_Next, tab1, iStart); VdbeCoverage(v);
      sqlite3VdbeResolveLabel(v, iBreak);
      sqlite3VdbeAddOp2(v, OP_Close, tab2, 0);
      sqlite3VdbeAddOp2(v, OP_Close, tab1, 0);
      break;
    }
  }

  explainComposite(pParse, p->op, iSub1, iSub2, p->op!=TK_ALL);







  /* Compute collating sequences used by 
  ** temporary tables needed to implement the compound select.
  ** Attach the KeyInfo structure to all temporary tables.
  **
  ** This section is run by the right-most SELECT statement only.
  ** SELECT statements to the left always skip this part.  The right-most
  ** SELECT might also skip this part if it has no ORDER BY clause and
................................................................................
  int op;               /* One of TK_ALL, TK_UNION, TK_EXCEPT, TK_INTERSECT */
  KeyInfo *pKeyDup = 0; /* Comparison information for duplicate removal */
  KeyInfo *pKeyMerge;   /* Comparison information for merging rows */
  sqlite3 *db;          /* Database connection */
  ExprList *pOrderBy;   /* The ORDER BY clause */
  int nOrderBy;         /* Number of terms in the ORDER BY clause */
  int *aPermute;        /* Mapping from ORDER BY terms to result set columns */
#ifndef SQLITE_OMIT_EXPLAIN
  int iSub1;            /* EQP id of left-hand query */
  int iSub2;            /* EQP id of right-hand query */
#endif

  assert( p->pOrderBy!=0 );
  assert( pKeyDup==0 ); /* "Managed" code needs this.  Ticket #3382. */
  db = pParse->db;
  v = pParse->pVdbe;
  assert( v!=0 );       /* Already thrown the error if VDBE alloc failed */
  labelEnd = sqlite3VdbeMakeLabel(v);
................................................................................
  regAddrA = ++pParse->nMem;
  regAddrB = ++pParse->nMem;
  regOutA = ++pParse->nMem;
  regOutB = ++pParse->nMem;
  sqlite3SelectDestInit(&destA, SRT_Coroutine, regAddrA);
  sqlite3SelectDestInit(&destB, SRT_Coroutine, regAddrB);



  /* Generate a coroutine to evaluate the SELECT statement to the
  ** left of the compound operator - the "A" select.
  */
  addrSelectA = sqlite3VdbeCurrentAddr(v) + 1;
  addr1 = sqlite3VdbeAddOp3(v, OP_InitCoroutine, regAddrA, 0, addrSelectA);
  VdbeComment((v, "left SELECT"));
  pPrior->iLimit = regLimitA;
  explainSetInteger(iSub1, pParse->iNextSelectId);
  sqlite3Select(pParse, pPrior, &destA);
  sqlite3VdbeEndCoroutine(v, regAddrA);
  sqlite3VdbeJumpHere(v, addr1);

  /* Generate a coroutine to evaluate the SELECT statement on 
  ** the right - the "B" select
  */
................................................................................
  addrSelectB = sqlite3VdbeCurrentAddr(v) + 1;
  addr1 = sqlite3VdbeAddOp3(v, OP_InitCoroutine, regAddrB, 0, addrSelectB);
  VdbeComment((v, "right SELECT"));
  savedLimit = p->iLimit;
  savedOffset = p->iOffset;
  p->iLimit = regLimitB;
  p->iOffset = 0;  
  explainSetInteger(iSub2, pParse->iNextSelectId);
  sqlite3Select(pParse, p, &destB);
  p->iLimit = savedLimit;
  p->iOffset = savedOffset;
  sqlite3VdbeEndCoroutine(v, regAddrB);

  /* Generate a subroutine that outputs the current row of the A
  ** select as the next output row of the compound select.
................................................................................
    sqlite3SelectDelete(db, p->pPrior);
  }
  p->pPrior = pPrior;
  pPrior->pNext = p;

  /*** TBD:  Insert subroutine calls to close cursors on incomplete
  **** subqueries ****/
  explainComposite(pParse, p->op, iSub1, iSub2, 0);
  return pParse->nErr!=0;
}
#endif

#if !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW)

/* An instance of the SubstContext object describes an substitution edit
................................................................................
static void explainSimpleCount(
  Parse *pParse,                  /* Parse context */
  Table *pTab,                    /* Table being queried */
  Index *pIdx                     /* Index used to optimize scan, or NULL */
){
  if( pParse->explain==2 ){
    int bCover = (pIdx!=0 && (HasRowid(pTab) || !IsPrimaryKeyIndex(pIdx)));
    char *zEqp = sqlite3MPrintf(pParse->db, "SCAN TABLE %s%s%s",
        pTab->zName,
        bCover ? " USING COVERING INDEX " : "",
        bCover ? pIdx->zName : ""
    );
    sqlite3VdbeAddOp4(
        pParse->pVdbe, OP_Explain, pParse->iSelectId, 0, 0, zEqp, P4_DYNAMIC
    );
  }
}
#else
# define explainSimpleCount(a,b,c)
#endif

/*
................................................................................
  SortCtx sSort;         /* Info on how to code the ORDER BY clause */
  AggInfo sAggInfo;      /* Information used by aggregate queries */
  int iEnd;              /* Address of the end of the query */
  sqlite3 *db;           /* The database connection */
  ExprList *pMinMaxOrderBy = 0;  /* Added ORDER BY for min/max queries */
  u8 minMaxFlag;                 /* Flag for min/max queries */

#ifndef SQLITE_OMIT_EXPLAIN
  int iRestoreSelectId = pParse->iSelectId;
  pParse->iSelectId = pParse->iNextSelectId++;
#endif

  db = pParse->db;

  if( p==0 || db->mallocFailed || pParse->nErr ){
    return 1;
  }
  if( sqlite3AuthCheck(pParse, SQLITE_SELECT, 0, 0, 0) ) return 1;
  memset(&sAggInfo, 0, sizeof(sAggInfo));
#if SELECTTRACE_ENABLED
#ifndef SQLITE_OMIT_EXPLAIN
  p->iSelectId = pParse->iSelectId;
#endif
  SELECTTRACE(1,pParse,p, ("begin processing:\n", pParse->iSelectId));
  if( sqlite3SelectTrace & 0x100 ){
    sqlite3TreeViewSelect(0, p, 0);
  }
#endif

  assert( p->pOrderBy==0 || pDest->eDest!=SRT_DistFifo );
  assert( p->pOrderBy==0 || pDest->eDest!=SRT_Fifo );
................................................................................
#if SELECTTRACE_ENABLED
  if( sqlite3SelectTrace & 0x104 ){
    SELECTTRACE(0x104,pParse,p, ("after name resolution:\n"));
    sqlite3TreeViewSelect(0, p, 0);
  }
#endif

  /* Get a pointer the VDBE under construction, allocating a new VDBE if one
  ** does not already exist */
  v = sqlite3GetVdbe(pParse);
  if( v==0 ) goto select_end;
  if( pDest->eDest==SRT_Output ){
    generateColumnNames(pParse, p);
  }

  /* Try to various optimizations (flattening subqueries, and strength
  ** reduction of join operators) in the FROM clause up into the main query
  */
................................................................................
  /* Handle compound SELECT statements using the separate multiSelect()
  ** procedure.
  */
  if( p->pPrior ){
    rc = multiSelect(pParse, p, pDest);
#if SELECTTRACE_ENABLED
    SELECTTRACE(0x1,pParse,p,("end compound-select processing\n"));
    if( pParse->iSelectId==0 && (sqlite3SelectTrace & 0x2000)!=0 ){
      sqlite3TreeViewSelect(0, p, 0);
    }
#endif
    explainSetInteger(pParse->iSelectId, iRestoreSelectId);
    return rc;
  }
#endif

  /* For each term in the FROM clause, do two things:
  ** (1) Authorized unreferenced tables
  ** (2) Generate code for all sub-queries
................................................................................
      int addrTop = sqlite3VdbeCurrentAddr(v)+1;
     
      pItem->regReturn = ++pParse->nMem;
      sqlite3VdbeAddOp3(v, OP_InitCoroutine, pItem->regReturn, 0, addrTop);
      VdbeComment((v, "%s", pItem->pTab->zName));
      pItem->addrFillSub = addrTop;
      sqlite3SelectDestInit(&dest, SRT_Coroutine, pItem->regReturn);
      explainSetInteger(pItem->iSelectId, (u8)pParse->iNextSelectId);
      sqlite3Select(pParse, pSub, &dest);
      pItem->pTab->nRowLogEst = pSub->nSelectRow;
      pItem->fg.viaCoroutine = 1;
      pItem->regResult = dest.iSdst;
      sqlite3VdbeEndCoroutine(v, pItem->regReturn);
      sqlite3VdbeJumpHere(v, addrTop-1);
      sqlite3ClearTempRegCache(pParse);
................................................................................
        VdbeComment((v, "materialize \"%s\"", pItem->pTab->zName));
      }else{
        VdbeNoopComment((v, "materialize \"%s\"", pItem->pTab->zName));
      }
      pPrior = isSelfJoinView(pTabList, pItem);
      if( pPrior ){
        sqlite3VdbeAddOp2(v, OP_OpenDup, pItem->iCursor, pPrior->iCursor);
        explainSetInteger(pItem->iSelectId, pPrior->iSelectId);
        assert( pPrior->pSelect!=0 );
        pSub->nSelectRow = pPrior->pSelect->nSelectRow;
      }else{
        sqlite3SelectDestInit(&dest, SRT_EphemTab, pItem->iCursor);
        explainSetInteger(pItem->iSelectId, (u8)pParse->iNextSelectId);
        sqlite3Select(pParse, pSub, &dest);
      }
      pItem->pTab->nRowLogEst = pSub->nSelectRow;
      if( onceAddr ) sqlite3VdbeJumpHere(v, onceAddr);
      retAddr = sqlite3VdbeAddOp1(v, OP_Return, pItem->regReturn);
      VdbeComment((v, "end %s", pItem->pTab->zName));
      sqlite3VdbeChangeP1(v, topAddr, retAddr);
................................................................................
  */
select_end:
  sqlite3ExprListDelete(db, pMinMaxOrderBy);
  sqlite3DbFree(db, sAggInfo.aCol);
  sqlite3DbFree(db, sAggInfo.aFunc);
#if SELECTTRACE_ENABLED
  SELECTTRACE(0x1,pParse,p,("end processing\n"));
  if( pParse->iSelectId==0 && (sqlite3SelectTrace & 0x2000)!=0 ){
    sqlite3TreeViewSelect(0, p, 0);
  }
#endif
  explainSetInteger(pParse->iSelectId, iRestoreSelectId);
  return rc;
}

/************** End of select.c **********************************************/
/************** Begin file table.c *******************************************/
/*
** 2001 September 15
................................................................................

  /* printf("SQL: [%s]\n", zSql); fflush(stdout); */
  rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0);
  if( rc!=SQLITE_OK ) return rc;
  while( SQLITE_ROW==(rc = sqlite3_step(pStmt)) ){
    const char *zSubSql = (const char*)sqlite3_column_text(pStmt,0);
    assert( sqlite3_strnicmp(zSql,"SELECT",6)==0 );
    assert( sqlite3_strnicmp(zSubSql,"SELECT",6)!=0 || CORRUPT_DB );




    if( zSubSql && zSubSql[0]!='S' ){


      rc = execSql(db, pzErrMsg, zSubSql);
      if( rc!=SQLITE_OK ) break;
    }
  }
  assert( rc!=SQLITE_ROW );
  if( rc==SQLITE_DONE ) rc = SQLITE_OK;
  if( rc ){
................................................................................
      " WHERE type='table'AND name<>'sqlite_sequence'"
      " AND coalesce(rootpage,1)>0",
      zDbMain
  );
  if( rc!=SQLITE_OK ) goto end_of_vacuum;
  rc = execSqlF(db, pzErrMsg,
      "SELECT sql FROM \"%w\".sqlite_master"
      " WHERE type='index' AND length(sql)>10",
      zDbMain
  );
  if( rc!=SQLITE_OK ) goto end_of_vacuum;
  db->init.iDb = 0;

  /* Loop through the tables in the main database. For each, do
  ** an "INSERT INTO vacuum_db.xxx SELECT * FROM main.xxx;" to copy
................................................................................
#if !defined(SQLITE_DEBUG) && !defined(SQLITE_ENABLE_STMT_SCANSTATUS)
  if( sqlite3ParseToplevel(pParse)->explain==2 )
#endif
  {
    struct SrcList_item *pItem = &pTabList->a[pLevel->iFrom];
    Vdbe *v = pParse->pVdbe;      /* VM being constructed */
    sqlite3 *db = pParse->db;     /* Database handle */
    int iId = pParse->iSelectId;  /* Select id (left-most output column) */
    int isSearch;                 /* True for a SEARCH. False for SCAN. */
    WhereLoop *pLoop;             /* The controlling WhereLoop object */
    u32 flags;                    /* Flags that describe this loop */
    char *zMsg;                   /* Text to add to EQP output */
    StrAccum str;                 /* EQP output string */
    char zBuf[100];               /* Initial space for EQP output string */

................................................................................
    isSearch = (flags&(WHERE_BTM_LIMIT|WHERE_TOP_LIMIT))!=0
            || ((flags&WHERE_VIRTUALTABLE)==0 && (pLoop->u.btree.nEq>0))
            || (wctrlFlags&(WHERE_ORDERBY_MIN|WHERE_ORDERBY_MAX));

    sqlite3StrAccumInit(&str, db, zBuf, sizeof(zBuf), SQLITE_MAX_LENGTH);
    sqlite3StrAccumAppendAll(&str, isSearch ? "SEARCH" : "SCAN");
    if( pItem->pSelect ){
      sqlite3XPrintf(&str, " SUBQUERY %d", pItem->iSelectId);
    }else{
      sqlite3XPrintf(&str, " TABLE %s", pItem->zName);
    }

    if( pItem->zAlias ){
      sqlite3XPrintf(&str, " AS %s", pItem->zAlias);
    }
................................................................................
    if( pLoop->nOut>=10 ){
      sqlite3XPrintf(&str, " (~%llu rows)", sqlite3LogEstToInt(pLoop->nOut));
    }else{
      sqlite3StrAccumAppend(&str, " (~1 row)", 9);
    }
#endif
    zMsg = sqlite3StrAccumFinish(&str);
    ret = sqlite3VdbeAddOp4(v, OP_Explain, iId, iLevel, iFrom, zMsg,P4_DYNAMIC);

  }
  return ret;
}
#endif /* SQLITE_OMIT_EXPLAIN */

#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
/*
................................................................................
    }

    /* Run a separate WHERE clause for each term of the OR clause.  After
    ** eliminating duplicates from other WHERE clauses, the action for each
    ** sub-WHERE clause is to to invoke the main loop body as a subroutine.
    */
    wctrlFlags =  WHERE_OR_SUBCLAUSE | (pWInfo->wctrlFlags & WHERE_SEEK_TABLE);

    for(ii=0; ii<pOrWc->nTerm; ii++){
      WhereTerm *pOrTerm = &pOrWc->a[ii];
      if( pOrTerm->leftCursor==iCur || (pOrTerm->eOperator & WO_AND)!=0 ){
        WhereInfo *pSubWInfo;           /* Info for single OR-term scan */
        Expr *pOrExpr = pOrTerm->pExpr; /* Current OR clause term */
        int jmp1 = 0;                   /* Address of jump operation */
        assert( (pTabItem[0].fg.jointype & JT_LEFT)==0 
................................................................................
          }

          /* Finish the loop through table entries that match term pOrTerm. */
          sqlite3WhereEnd(pSubWInfo);
        }
      }
    }

    pLevel->u.pCovidx = pCov;
    if( pCov ) pLevel->iIdxCur = iCovCur;
    if( pAndExpr ){
      pAndExpr->pLeft = 0;
      sqlite3ExprDelete(db, pAndExpr);
    }
    sqlite3VdbeChangeP1(v, iRetInit, sqlite3VdbeCurrentAddr(v));
................................................................................
  /* Special case: No FROM clause
  */
  if( nTabList==0 ){
    if( pOrderBy ) pWInfo->nOBSat = pOrderBy->nExpr;
    if( wctrlFlags & WHERE_WANT_DISTINCT ){
      pWInfo->eDistinct = WHERE_DISTINCT_UNIQUE;
    }

  }else{
    /* Assign a bit from the bitmask to every term in the FROM clause.
    **
    ** The N-th term of the FROM clause is assigned a bitmask of 1<<N.
    **
    ** The rule of the previous sentence ensures thta if X is the bitmask for
    ** a table T, then X-1 is the bitmask for all other tables to the left of T.
................................................................................
        { SQLITE_DBCONFIG_ENABLE_FKEY,           SQLITE_ForeignKeys    },
        { SQLITE_DBCONFIG_ENABLE_TRIGGER,        SQLITE_EnableTrigger  },
        { SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER, SQLITE_Fts3Tokenizer  },
        { SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION, SQLITE_LoadExtension  },
        { SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE,      SQLITE_NoCkptOnClose  },
        { SQLITE_DBCONFIG_ENABLE_QPSG,           SQLITE_EnableQPSG     },
        { SQLITE_DBCONFIG_TRIGGER_EQP,           SQLITE_TriggerEQP     },

      };
      unsigned int i;
      rc = SQLITE_ERROR; /* IMP: R-42790-23372 */
      for(i=0; i<ArraySize(aFlagOp); i++){
        if( aFlagOp[i].op==op ){
          int onoff = va_arg(ap, int);
          int *pRes = va_arg(ap, int*);
................................................................................

/* fts3_expr.c */
SQLITE_PRIVATE int sqlite3Fts3ExprParse(sqlite3_tokenizer *, int,
  char **, int, int, int, const char *, int, Fts3Expr **, char **
);
SQLITE_PRIVATE void sqlite3Fts3ExprFree(Fts3Expr *);
#ifdef SQLITE_TEST
SQLITE_PRIVATE int sqlite3Fts3ExprInitTestInterface(sqlite3 *db);
SQLITE_PRIVATE int sqlite3Fts3InitTerm(sqlite3 *db);
#endif

SQLITE_PRIVATE int sqlite3Fts3OpenTokenizer(sqlite3_tokenizer *, int, const char *, int,
  sqlite3_tokenizer_cursor **
);

................................................................................
    ){
      rc = SQLITE_NOMEM;
    }
  }

#ifdef SQLITE_TEST
  if( rc==SQLITE_OK ){
    rc = sqlite3Fts3ExprInitTestInterface(db);
  }
#endif

  /* Create the virtual table wrapper around the hash-table and overload 
  ** the four scalar functions. If this is successful, register the
  ** module with sqlite.
  */
................................................................................
** Everything after this point is just test code.
*/

#ifdef SQLITE_TEST

/* #include <stdio.h> */

/*
** Function to query the hash-table of tokenizers (see README.tokenizers).
*/
static int queryTestTokenizer(
  sqlite3 *db, 
  const char *zName,  
  const sqlite3_tokenizer_module **pp
){
  int rc;
  sqlite3_stmt *pStmt;
  const char zSql[] = "SELECT fts3_tokenizer(?)";

  *pp = 0;
  rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0);
  if( rc!=SQLITE_OK ){
    return rc;
  }

  sqlite3_bind_text(pStmt, 1, zName, -1, SQLITE_STATIC);
  if( SQLITE_ROW==sqlite3_step(pStmt) ){
    if( sqlite3_column_type(pStmt, 0)==SQLITE_BLOB ){
      memcpy((void *)pp, sqlite3_column_blob(pStmt, 0), sizeof(*pp));
    }
  }

  return sqlite3_finalize(pStmt);
}

/*
** Return a pointer to a buffer containing a text representation of the
** expression passed as the first argument. The buffer is obtained from
** sqlite3_malloc(). It is the responsibility of the caller to use 
** sqlite3_free() to release the memory. If an OOM condition is encountered,
** NULL is returned.
**
................................................................................
** to parse the query expression (see README.tokenizers). The second argument
** is the query expression to parse. Each subsequent argument is the name
** of a column of the fts3 table that the query expression may refer to.
** For example:
**
**   SELECT fts3_exprtest('simple', 'Bill col2:Bloggs', 'col1', 'col2');
*/
static void fts3ExprTest(

  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  sqlite3_tokenizer_module const *pModule = 0;
  sqlite3_tokenizer *pTokenizer = 0;
  int rc;
  char **azCol = 0;
  const char *zExpr;
  int nExpr;
  int nCol;
  int ii;
  Fts3Expr *pExpr;
  char *zBuf = 0;
  sqlite3 *db = sqlite3_context_db_handle(context);



  if( argc<3 ){
    sqlite3_result_error(context, 
        "Usage: fts3_exprtest(tokenizer, expr, col1, ...", -1
    );
    return;
  }

  rc = queryTestTokenizer(db,
                          (const char *)sqlite3_value_text(argv[0]), &pModule);


  if( rc==SQLITE_NOMEM ){
    sqlite3_result_error_nomem(context);
    goto exprtest_out;
  }else if( !pModule ){
    sqlite3_result_error(context, "No such tokenizer module", -1);
    goto exprtest_out;
  }



  rc = pModule->xCreate(0, 0, &pTokenizer);
  assert( rc==SQLITE_NOMEM || rc==SQLITE_OK );
  if( rc==SQLITE_NOMEM ){
    sqlite3_result_error_nomem(context);
    goto exprtest_out;
  }
  pTokenizer->pModule = pModule;

  zExpr = (const char *)sqlite3_value_text(argv[1]);
  nExpr = sqlite3_value_bytes(argv[1]);
  nCol = argc-2;
  azCol = (char **)sqlite3_malloc(nCol*sizeof(char *));
  if( !azCol ){
    sqlite3_result_error_nomem(context);
    goto exprtest_out;
  }
  for(ii=0; ii<nCol; ii++){
    azCol[ii] = (char *)sqlite3_value_text(argv[ii+2]);
  }

  if( sqlite3_user_data(context) ){
    char *zDummy = 0;
    rc = sqlite3Fts3ExprParse(
        pTokenizer, 0, azCol, 0, nCol, nCol, zExpr, nExpr, &pExpr, &zDummy
    );
    assert( rc==SQLITE_OK || pExpr==0 );
    sqlite3_free(zDummy);
  }else{
................................................................................
    sqlite3_result_text(context, zBuf, -1, SQLITE_TRANSIENT);
    sqlite3_free(zBuf);
  }

  sqlite3Fts3ExprFree(pExpr);

exprtest_out:
  if( pModule && pTokenizer ){
    rc = pModule->xDestroy(pTokenizer);
  }
  sqlite3_free(azCol);
}
















/*
** Register the query expression parser test function fts3_exprtest() 
** with database connection db. 
*/
SQLITE_PRIVATE int sqlite3Fts3ExprInitTestInterface(sqlite3* db){
  int rc = sqlite3_create_function(
      db, "fts3_exprtest", -1, SQLITE_UTF8, 0, fts3ExprTest, 0, 0
  );
  if( rc==SQLITE_OK ){
    rc = sqlite3_create_function(db, "fts3_exprtest_rebalance", 
        -1, SQLITE_UTF8, (void *)1, fts3ExprTest, 0, 0
    );
  }
  return rc;
}

#endif
#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3) */
................................................................................
**
** RBU_STATE_COOKIE:
**   Valid if STAGE==1. The current change-counter cookie value in the 
**   target db file.
**
** RBU_STATE_OALSZ:
**   Valid if STAGE==1. The size in bytes of the *-oal file.




*/
#define RBU_STATE_STAGE        1
#define RBU_STATE_TBL          2
#define RBU_STATE_IDX          3
#define RBU_STATE_ROW          4
#define RBU_STATE_PROGRESS     5
#define RBU_STATE_CKPT         6
#define RBU_STATE_COOKIE       7
#define RBU_STATE_OALSZ        8
#define RBU_STATE_PHASEONESTEP 9


#define RBU_STAGE_OAL         1
#define RBU_STAGE_MOVE        2
#define RBU_STAGE_CAPTURE     3
#define RBU_STAGE_CKPT        4
#define RBU_STAGE_DONE        5

................................................................................

/*
** A structure to store values read from the rbu_state table in memory.
*/
struct RbuState {
  int eStage;
  char *zTbl;

  char *zIdx;
  i64 iWalCksum;
  int nRow;
  i64 nProgress;
  u32 iCookie;
  i64 iOalSz;
  i64 nPhaseOneStep;
................................................................................

/*
** Free an RbuState object allocated by rbuLoadState().
*/
static void rbuFreeState(RbuState *p){
  if( p ){
    sqlite3_free(p->zTbl);

    sqlite3_free(p->zIdx);
    sqlite3_free(p);
  }
}

/*
** Allocate an RbuState object and load the contents of the rbu_state 
................................................................................
      case RBU_STATE_OALSZ:
        pRet->iOalSz = (u32)sqlite3_column_int64(pStmt, 1);
        break;

      case RBU_STATE_PHASEONESTEP:
        pRet->nPhaseOneStep = sqlite3_column_int64(pStmt, 1);
        break;





      default:
        rc = SQLITE_CORRUPT;
        break;
    }
  }
  rc2 = sqlite3_finalize(pStmt);
................................................................................
          "(%d, %Q), "
          "(%d, %Q), "
          "(%d, %d), "
          "(%d, %d), "
          "(%d, %lld), "
          "(%d, %lld), "
          "(%d, %lld), "
          "(%d, %lld) ",

          p->zStateDb,
          RBU_STATE_STAGE, eStage,
          RBU_STATE_TBL, p->objiter.zTbl, 
          RBU_STATE_IDX, p->objiter.zIdx, 
          RBU_STATE_ROW, p->nStep, 
          RBU_STATE_PROGRESS, p->nProgress,
          RBU_STATE_CKPT, p->iWalCksum,
          RBU_STATE_COOKIE, (i64)pFd->iCookie,
          RBU_STATE_OALSZ, p->iOalSz,
          RBU_STATE_PHASEONESTEP, p->nPhaseOneStep

      )
    );
    assert( pInsert==0 || rc==SQLITE_OK );

    if( rc==SQLITE_OK ){
      sqlite3_step(pInsert);
      rc = sqlite3_finalize(pInsert);
................................................................................
  assert( p->rc==SQLITE_OK );
  if( pState->zTbl ){
    RbuObjIter *pIter = &p->objiter;
    int rc = SQLITE_OK;

    while( rc==SQLITE_OK && pIter->zTbl && (pIter->bCleanup 
       || rbuStrCompare(pIter->zIdx, pState->zIdx)
       || rbuStrCompare(pIter->zTbl, pState->zTbl) 

    )){
      rc = rbuObjIterNext(p, pIter);
    }

    if( rc==SQLITE_OK && !pIter->zTbl ){
      rc = SQLITE_ERROR;
      p->zErrmsg = sqlite3_mprintf("rbu_state mismatch error");
................................................................................
static void fts5SourceIdFunc(
  sqlite3_context *pCtx,          /* Function call context */
  int nArg,                       /* Number of args */
  sqlite3_value **apUnused        /* Function arguments */
){
  assert( nArg==0 );
  UNUSED_PARAM2(nArg, apUnused);
  sqlite3_result_text(pCtx, "fts5: 2018-04-26 12:27:03 368c14da868a843767344f6cc17c499fddd83244c0510337ed9a918e64ee2413", -1, SQLITE_TRANSIENT);
}

static int fts5Init(sqlite3 *db){
  static const sqlite3_module fts5Mod = {
    /* iVersion      */ 2,
    /* xCreate       */ fts5CreateMethod,
    /* xConnect      */ fts5ConnectMethod,
................................................................................
#endif
  return rc;
}
#endif /* SQLITE_CORE */
#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_STMTVTAB) */

/************** End of stmt.c ************************************************/
#if __LINE__!=211000
#undef SQLITE_SOURCE_ID
#define SQLITE_SOURCE_ID      "2018-04-26 18:34:26 9fd0faf517993587d2f54212638545fc85fbbc84a031bcfae8c1e5894825alt2"
#endif
/* Return the source-id for this library */
SQLITE_API const char *sqlite3_sourceid(void){ return SQLITE_SOURCE_ID; }
/************************** End of sqlite3.c ******************************/

**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.24.0"
#define SQLITE_VERSION_NUMBER 3024000
#define SQLITE_SOURCE_ID      "2018-05-05 01:23:28 9191ff670cb7f36e0b2dac4a22888679b639845687aef8edcc3c05e35ba71eda"

/*
** CAPI3REF: Run-Time Library Version Numbers
** KEYWORDS: sqlite3_version sqlite3_sourceid
**
** These interfaces provide the same information as the [SQLITE_VERSION],
** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros
................................................................................
** behavior. The first parameter passed to this operation is an integer -
** positive to enable output for trigger programs, or zero to disable it,
** or negative to leave the setting unchanged.
** The second parameter is a pointer to an integer into which is written 
** 0 or 1 to indicate whether output-for-triggers has been disabled - 0 if 
** it is not disabled, 1 if it is.  
** </dd>
**
** <dt>SQLITE_DBCONFIG_RESET_DATABASE</dt>
** <dd> Set the SQLITE_DBCONFIG_RESET_DATABASE flag and then run
** [VACUUM] in order to reset a database back to an empty database
** with no schema and no content. The following process works even for
** a badly corrupted database file:
** <ol>
** <li> sqlite3_db_config(db, SQLITE_DBCONFIG_RESET_DATABASE, 1, 0);
** <li> [sqlite3_exec](db, "[VACUUM]", 0, 0, 0);
** <li> sqlite3_db_config(db, SQLITE_DBCONFIG_RESET_DATABASE, 0, 0);
** </ol>
** Because resetting a database is destructive and irreversible, the
** process requires the use of this obscure API and multiple steps to help
** ensure that it does not happen by accident.
** </dd>
** </dl>
*/
#define SQLITE_DBCONFIG_MAINDBNAME            1000 /* const char* */
#define SQLITE_DBCONFIG_LOOKASIDE             1001 /* void* int int */
#define SQLITE_DBCONFIG_ENABLE_FKEY           1002 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_TRIGGER        1003 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER 1004 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION 1005 /* int int* */
#define SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE      1006 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_QPSG           1007 /* int int* */
#define SQLITE_DBCONFIG_TRIGGER_EQP           1008 /* int int* */
#define SQLITE_DBCONFIG_RESET_DATABASE        1009 /* int int* */
#define SQLITE_DBCONFIG_MAX                   1009 /* Largest DBCONFIG */

/*
** CAPI3REF: Enable Or Disable Extended Result Codes
** METHOD: sqlite3
**
** ^The sqlite3_extended_result_codes() routine enables or disables the
** [extended result codes] feature of SQLite. ^The extended result
................................................................................
** using [sqlite3_free].
** Hence, if this variable is modified directly, either it should be
** made NULL or made to point to memory obtained from [sqlite3_malloc]
** or else the use of the [data_store_directory pragma] should be avoided.
*/
SQLITE_API char *sqlite3_data_directory;

/*
** CAPI3REF: Win32 Specific Interface
**
** These interfaces are available only on Windows.  The
** [sqlite3_win32_set_directory] interface is used to set the value associated
** with the [sqlite3_temp_directory] or [sqlite3_data_directory] variable, to
** zValue, depending on the value of the type parameter.  The zValue parameter
** should be NULL to cause the previous value to be freed via [sqlite3_free];
** a non-NULL value will be copied into memory obtained from [sqlite3_malloc]
** prior to being used.  The [sqlite3_win32_set_directory] interface returns
** [SQLITE_OK] to indicate success, [SQLITE_ERROR] if the type is unsupported,
** or [SQLITE_NOMEM] if memory could not be allocated.  The value of the
** [sqlite3_data_directory] variable is intended to act as a replacement for
** the current directory on the sub-platforms of Win32 where that concept is
** not present, e.g. WinRT and UWP.  The [sqlite3_win32_set_directory8] and
** [sqlite3_win32_set_directory16] interfaces behave exactly the same as the
** sqlite3_win32_set_directory interface except the string parameter must be
** UTF-8 or UTF-16, respectively.
*/
SQLITE_API int sqlite3_win32_set_directory(
  unsigned long type, /* Identifier for directory being set or reset */
  void *zValue        /* New value for directory being set or reset */
);
SQLITE_API int sqlite3_win32_set_directory8(unsigned long type, const char *zValue);
SQLITE_API int sqlite3_win32_set_directory16(unsigned long type, const void *zValue);

/*
** CAPI3REF: Win32 Directory Types
**
** These macros are only available on Windows.  They define the allowed values
** for the type argument to the [sqlite3_win32_set_directory] interface.
*/
#define SQLITE_WIN32_DATA_DIRECTORY_TYPE  1
#define SQLITE_WIN32_TEMP_DIRECTORY_TYPE  2

/*
** CAPI3REF: Test For Auto-Commit Mode
** KEYWORDS: {autocommit mode}
** METHOD: sqlite3
**
** ^The sqlite3_get_autocommit() interface returns non-zero or
** zero if the given database connection is or is not in autocommit mode,
................................................................................
#if defined(SQLITE_DEBUG) && !defined(SQLITE_TEST_REALLOC_STRESS)
SQLITE_PRIVATE   void sqlite3VdbeVerifyNoMallocRequired(Vdbe *p, int N);
SQLITE_PRIVATE   void sqlite3VdbeVerifyNoResultRow(Vdbe *p);
#else
# define sqlite3VdbeVerifyNoMallocRequired(A,B)
# define sqlite3VdbeVerifyNoResultRow(A)
#endif
SQLITE_PRIVATE VdbeOp *sqlite3VdbeAddOpList(Vdbe*, int nOp, VdbeOpList const *aOp,int iLineno);
#ifndef SQLITE_OMIT_EXPLAIN
SQLITE_PRIVATE   void sqlite3VdbeExplain(Parse*,u8,const char*,...);
SQLITE_PRIVATE   void sqlite3VdbeExplainPop(Parse*);
SQLITE_PRIVATE   int sqlite3VdbeExplainParent(Parse*);
# define ExplainQueryPlan(P)        sqlite3VdbeExplain P
# define ExplainQueryPlanPop(P)     sqlite3VdbeExplainPop(P)
# define ExplainQueryPlanParent(P)  sqlite3VdbeExplainParent(P)
#else
# define ExplainQueryPlan(P)
# define ExplainQueryPlanPop(P)
# define ExplainQueryPlanParent(P) 0
#endif
SQLITE_PRIVATE void sqlite3VdbeAddParseSchemaOp(Vdbe*,int,char*);
SQLITE_PRIVATE void sqlite3VdbeChangeOpcode(Vdbe*, u32 addr, u8);
SQLITE_PRIVATE void sqlite3VdbeChangeP1(Vdbe*, u32 addr, int P1);
SQLITE_PRIVATE void sqlite3VdbeChangeP2(Vdbe*, u32 addr, int P2);
SQLITE_PRIVATE void sqlite3VdbeChangeP3(Vdbe*, u32 addr, int P3);
SQLITE_PRIVATE void sqlite3VdbeChangeP5(Vdbe*, u16 P5);
SQLITE_PRIVATE void sqlite3VdbeJumpHere(Vdbe*, int addr);
................................................................................
#define SQLITE_EnableTrigger  0x00040000  /* True to enable triggers */
#define SQLITE_DeferFKs       0x00080000  /* Defer all FK constraints */
#define SQLITE_QueryOnly      0x00100000  /* Disable database changes */
#define SQLITE_CellSizeCk     0x00200000  /* Check btree cell sizes on load */
#define SQLITE_Fts3Tokenizer  0x00400000  /* Enable fts3_tokenizer(2) */
#define SQLITE_EnableQPSG     0x00800000  /* Query Planner Stability Guarantee*/
#define SQLITE_TriggerEQP     0x01000000  /* Show trigger EXPLAIN QUERY PLAN */
#define SQLITE_ResetDatabase  0x02000000  /* Reset the database */

/* Flags used only if debugging */
#ifdef SQLITE_DEBUG
#define SQLITE_SqlTrace       0x08000000  /* Debug print SQL as it executes */
#define SQLITE_VdbeListing    0x10000000  /* Debug listings of VDBE programs */
#define SQLITE_VdbeTrace      0x20000000  /* True to trace VDBE execution */
#define SQLITE_VdbeAddopTrace 0x40000000  /* Trace sqlite3VdbeAddOp() calls */
................................................................................
      unsigned notIndexed :1;    /* True if there is a NOT INDEXED clause */
      unsigned isIndexedBy :1;   /* True if there is an INDEXED BY clause */
      unsigned isTabFunc :1;     /* True if table-valued-function syntax */
      unsigned isCorrelated :1;  /* True if sub-query is correlated */
      unsigned viaCoroutine :1;  /* Implemented as a co-routine */
      unsigned isRecursive :1;   /* True for recursive reference in WITH */
    } fg;



    int iCursor;      /* The VDBE cursor number used to access this table */
    Expr *pOn;        /* The ON clause of a join */
    IdList *pUsing;   /* The USING clause of a join */
    Bitmask colUsed;  /* Bit N (1<<N) set if column N of pTab is used */
    union {
      char *zIndexedBy;    /* Identifier from "INDEXED BY <zIndex>" clause */
      ExprList *pFuncArg;  /* Arguments to table-valued-function */
................................................................................
  int iIdxCur;              /* Index of the first index cursor */
};

/*
** An instance of the following structure contains all information
** needed to generate code for a single SELECT statement.
**
** See the header comment on the computeLimitRegisters() routine for a
** detailed description of the meaning of the iLimit and iOffset fields.



**
** addrOpenEphm[] entries contain the address of OP_OpenEphemeral opcodes.
** These addresses must be stored so that we can go back and fill in
** the P4_KEYINFO and P2 parameters later.  Neither the KeyInfo nor
** the number of columns in P2 can be computed at the same time
** as the OP_OpenEphm instruction is coded because not
** enough information about the compound query is known at that point.
................................................................................
  ExprList *pEList;      /* The fields of the result */
  u8 op;                 /* One of: TK_UNION TK_ALL TK_INTERSECT TK_EXCEPT */
  LogEst nSelectRow;     /* Estimated number of result rows */
  u32 selFlags;          /* Various SF_* values */
  int iLimit, iOffset;   /* Memory registers holding LIMIT & OFFSET counters */
#if SELECTTRACE_ENABLED
  char zSelName[12];     /* Symbolic name of this SELECT use for debugging */

#endif
  int addrOpenEphm[2];   /* OP_OpenEphem opcodes related to this select */
  SrcList *pSrc;         /* The FROM clause */
  Expr *pWhere;          /* The WHERE clause */
  ExprList *pGroupBy;    /* The GROUP BY clause */
  Expr *pHaving;         /* The HAVING clause */
  ExprList *pOrderBy;    /* The ORDER BY clause */
................................................................................
#define SF_NestedFrom     0x00800  /* Part of a parenthesized FROM clause */
#define SF_MinMaxAgg      0x01000  /* Aggregate containing min() or max() */
#define SF_Recursive      0x02000  /* The recursive part of a recursive CTE */
#define SF_FixedLimit     0x04000  /* nSelectRow set by a constant LIMIT */
#define SF_MaybeConvert   0x08000  /* Need convertCompoundSelectToSubquery() */
#define SF_Converted      0x10000  /* By convertCompoundSelectToSubquery() */
#define SF_IncludeHidden  0x20000  /* Include hidden columns in output */
#define SF_ComplexResult  0x40000  /* Result contains subquery or function */


/*
** The results of a SELECT can be distributed in several ways, as defined
** by one of the following macros.  The "SRT" prefix means "SELECT Result
** Type".
**
**     SRT_Union       Store results as a key in a temporary index
................................................................................
  u8 explain;               /* True if the EXPLAIN flag is found on the query */
#ifndef SQLITE_OMIT_VIRTUALTABLE
  u8 declareVtab;           /* True if inside sqlite3_declare_vtab() */
  int nVtabLock;            /* Number of virtual tables to lock */
#endif
  int nHeight;              /* Expression tree height of current sub-select */
#ifndef SQLITE_OMIT_EXPLAIN
  int addrExplain;          /* Address of current OP_Explain opcode */

#endif
  VList *pVList;            /* Mapping between variable names and numbers */
  Vdbe *pReprepare;         /* VM being reprepared (sqlite3Reprepare()) */
  const char *zTail;        /* All SQL text past the last semicolon parsed */
  Table *pNewTable;         /* A table being constructed by CREATE TABLE */
  Trigger *pNewTrigger;     /* Trigger under construct by a CREATE TRIGGER */
  const char *zAuthContext; /* The 6th parameter to db->xAuth callbacks */
................................................................................
    sqlite3TreeViewWith(pView, p->pWith, 1);
    cnt = 1;
    sqlite3TreeViewPush(pView, 1);
  }
  do{
#if SELECTTRACE_ENABLED
    sqlite3TreeViewLine(pView,
      "SELECT%s%s (%s/%p) selFlags=0x%x nSelectRow=%d",
      ((p->selFlags & SF_Distinct) ? " DISTINCT" : ""),
      ((p->selFlags & SF_Aggregate) ? " agg_flag" : ""),
      p->zSelName, p, p->selFlags,
      (int)p->nSelectRow
    );
#else
    sqlite3TreeViewLine(pView, "SELECT%s%s (0x%p) selFlags=0x%x nSelectRow=%d",
      ((p->selFlags & SF_Distinct) ? " DISTINCT" : ""),
      ((p->selFlags & SF_Aggregate) ? " agg_flag" : ""), p, p->selFlags,
      (int)p->nSelectRow
................................................................................
/*
 * The size of the buffer used by sqlite3_win32_write_debug().
 */
#ifndef SQLITE_WIN32_DBG_BUF_SIZE
#  define SQLITE_WIN32_DBG_BUF_SIZE   ((int)(4096-sizeof(DWORD)))
#endif

















/*
 * If compiled with SQLITE_WIN32_MALLOC on Windows, we will use the
 * various Win32 API heap functions instead of our own.
 */
#ifdef SQLITE_WIN32_MALLOC

/*
................................................................................
#ifndef SQLITE_OMIT_AUTOINIT
  if( sqlite3_initialize() ) return 0;
#endif
  return winUtf8ToMbcs(zText, useAnsi);
}

/*
** This function is the same as sqlite3_win32_set_directory (below); however,
** it accepts a UTF-8 string.
*/
SQLITE_API int sqlite3_win32_set_directory8(
  unsigned long type, /* Identifier for directory being set or reset */
  const char *zValue  /* New value for directory being set or reset */
){
  char **ppDirectory = 0;
#ifndef SQLITE_OMIT_AUTOINIT
  int rc = sqlite3_initialize();
  if( rc ) return rc;
#endif
  if( type==SQLITE_WIN32_DATA_DIRECTORY_TYPE ){
    ppDirectory = &sqlite3_data_directory;
................................................................................
    ppDirectory = &sqlite3_temp_directory;
  }
  assert( !ppDirectory || type==SQLITE_WIN32_DATA_DIRECTORY_TYPE
          || type==SQLITE_WIN32_TEMP_DIRECTORY_TYPE
  );
  assert( !ppDirectory || sqlite3MemdebugHasType(*ppDirectory, MEMTYPE_HEAP) );
  if( ppDirectory ){
    char *zCopy = 0;
    if( zValue && zValue[0] ){
      zCopy = sqlite3_mprintf("%s", zValue);
      if ( zCopy==0 ){
        return SQLITE_NOMEM_BKPT;
      }
    }
    sqlite3_free(*ppDirectory);
    *ppDirectory = zCopy;
    return SQLITE_OK;
  }
  return SQLITE_ERROR;
}

/*
** This function is the same as sqlite3_win32_set_directory (below); however,
** it accepts a UTF-16 string.
*/
SQLITE_API int sqlite3_win32_set_directory16(
  unsigned long type, /* Identifier for directory being set or reset */
  const void *zValue  /* New value for directory being set or reset */
){
  int rc;
  char *zUtf8 = 0;
  if( zValue ){
    zUtf8 = sqlite3_win32_unicode_to_utf8(zValue);
    if( zUtf8==0 ) return SQLITE_NOMEM_BKPT;
  }
  rc = sqlite3_win32_set_directory8(type, zUtf8);
  if( zUtf8 ) sqlite3_free(zUtf8);
  return rc;
}

/*
** This function sets the data directory or the temporary directory based on
** the provided arguments.  The type argument must be 1 in order to set the
** data directory or 2 in order to set the temporary directory.  The zValue
** argument is the name of the directory to use.  The return value will be
** SQLITE_OK if successful.
*/
SQLITE_API int sqlite3_win32_set_directory(
  unsigned long type, /* Identifier for directory being set or reset */
  void *zValue        /* New value for directory being set or reset */
){
  return sqlite3_win32_set_directory16(type, zValue);
}

/*
** The return value of winGetLastErrorMsg
** is zero if the error message fits in the buffer, or non-zero
** otherwise (if the message was truncated).
*/
static int winGetLastErrorMsg(DWORD lastErrno, int nBuf, char *zBuf){
................................................................................
          pDb->safety_level | (db->flags & PAGER_FLAGS_MASK));
    }
  }
}
#else
# define setDefaultSyncFlag(pBt,safety_level)
#endif

/* Forward declaration */
static int newDatabase(BtShared*);


/*
** Get a reference to pPage1 of the database file.  This will
** also acquire a readlock on that file.
**
** SQLITE_OK is returned on success.  If the file is not a
** well-formed database file, then SQLITE_CORRUPT is returned.
................................................................................
  /* Do some checking to help insure the file we opened really is
  ** a valid database file. 
  */
  nPage = nPageHeader = get4byte(28+(u8*)pPage1->aData);
  sqlite3PagerPagecount(pBt->pPager, &nPageFile);
  if( nPage==0 || memcmp(24+(u8*)pPage1->aData, 92+(u8*)pPage1->aData,4)!=0 ){
    nPage = nPageFile;
  }
  if( (pBt->db->flags & SQLITE_ResetDatabase)!=0 ){
    nPage = 0;
  }
  if( nPage>0 ){
    u32 pageSize;
    u32 usableSize;
    u8 *page1 = pPage1->aData;
    rc = SQLITE_NOTADB;
    /* EVIDENCE-OF: R-43737-39999 Every valid SQLite database file begins
................................................................................
  u32 ovflPageSize;

  assert( sqlite3_mutex_held(pPage->pBt->mutex) );
  pPage->xParseCell(pPage, pCell, pInfo);
  if( pInfo->nLocal==pInfo->nPayload ){
    return SQLITE_OK;  /* No overflow pages. Return without doing anything */
  }
  testcase( pCell + pInfo->nSize == pPage->aDataEnd );
  testcase( pCell + (pInfo->nSize-1) == pPage->aDataEnd );
  if( pCell + pInfo->nSize > pPage->aDataEnd ){
    /* Cell extends past end of page */
    return SQLITE_CORRUPT_PAGE(pPage);
  }
  ovflPgno = get4byte(pCell + pInfo->nSize - 4);
  pBt = pPage->pBt;
  assert( pBt->usableSize > 4 );
  ovflPageSize = pBt->usableSize - 4;
................................................................................
  int p4type          /* P4 operand type */
){
  char *p4copy = sqlite3DbMallocRawNN(sqlite3VdbeDb(p), 8);
  if( p4copy ) memcpy(p4copy, zP4, 8);
  return sqlite3VdbeAddOp4(p, op, p1, p2, p3, p4copy, p4type);
}

#ifndef SQLITE_OMIT_EXPLAIN
/*
** Return the address of the current EXPLAIN QUERY PLAN baseline.
** 0 means "none".
*/
SQLITE_PRIVATE int sqlite3VdbeExplainParent(Parse *pParse){
  VdbeOp *pOp;
  if( pParse->addrExplain==0 ) return 0;
  pOp = sqlite3VdbeGetOp(pParse->pVdbe, pParse->addrExplain);
  return pOp->p2;
}

/*
** Add a new OP_Explain opcode.
**
** If the bPush flag is true, then make this opcode the parent for
** subsequent Explains until sqlite3VdbeExplainPop() is called.
*/
SQLITE_PRIVATE void sqlite3VdbeExplain(Parse *pParse, u8 bPush, const char *zFmt, ...){
  if( pParse->explain==2 ){
    char *zMsg;
    Vdbe *v = pParse->pVdbe;
    va_list ap;
    int iThis;
    va_start(ap, zFmt);
    zMsg = sqlite3VMPrintf(pParse->db, zFmt, ap);
    va_end(ap);
    v = pParse->pVdbe;
    iThis = v->nOp;
    sqlite3VdbeAddOp4(v, OP_Explain, iThis, pParse->addrExplain, 0,
                      zMsg, P4_DYNAMIC);
    if( bPush) pParse->addrExplain = iThis;
  }
}

/*
** Pop the EXPLAIN QUERY PLAN stack one level.
*/
SQLITE_PRIVATE void sqlite3VdbeExplainPop(Parse *pParse){
  pParse->addrExplain = sqlite3VdbeExplainParent(pParse);
}
#endif /* SQLITE_OMIT_EXPLAIN */

/*
** Add an OP_ParseSchema opcode.  This routine is broken out from
** sqlite3VdbeAddOp4() since it needs to also needs to mark all btrees
** as having been used.
**
** The zWhere string must have been obtained from sqlite3_malloc().
** This routine will take ownership of the allocated memory.
................................................................................
            if( aiMap ) aiMap[i] = j;
          }
  
          assert( i==nExpr || colUsed!=(MASKBIT(nExpr)-1) );
          if( colUsed==(MASKBIT(nExpr)-1) ){
            /* If we reach this point, that means the index pIdx is usable */
            int iAddr = sqlite3VdbeAddOp0(v, OP_Once); VdbeCoverage(v);
            ExplainQueryPlan((pParse, 0,

                              "USING INDEX %s FOR IN-OPERATOR",pIdx->zName));


            sqlite3VdbeAddOp3(v, OP_OpenRead, iTab, pIdx->tnum, iDb);
            sqlite3VdbeSetP4KeyInfo(pParse, pIdx);
            VdbeComment((v, "%s", pIdx->zName));
            assert( IN_INDEX_INDEX_DESC == IN_INDEX_INDEX_ASC+1 );
            eType = IN_INDEX_INDEX_ASC + pIdx->aSortOrder[0];
  
            if( prRhsHasNull ){
................................................................................
        **
        ** Generate code to write the results of the select into the temporary
        ** table allocated and opened above.
        */
        Select *pSelect = pExpr->x.pSelect;
        ExprList *pEList = pSelect->pEList;

        ExplainQueryPlan((pParse, 1, "%sLIST SUBQUERY",


            jmpIfDynamic>=0?"":"CORRELATED "

        ));





        assert( !isRowid );
        /* If the LHS and RHS of the IN operator do not match, that
        ** error will have been caught long before we reach this point. */
        if( ALWAYS(pEList->nExpr==nVal) ){
          SelectDest dest;
          int i;
          sqlite3SelectDestInit(&dest, SRT_Set, pExpr->iTable);
................................................................................
      Expr *pLimit;                         /* New limit expression */

      testcase( pExpr->op==TK_EXISTS );
      testcase( pExpr->op==TK_SELECT );
      assert( pExpr->op==TK_EXISTS || pExpr->op==TK_SELECT );
      assert( ExprHasProperty(pExpr, EP_xIsSelect) );

      pSel = pExpr->x.pSelect;
      ExplainQueryPlan((pParse, 1, "%sSCALAR SUBQUERY",

            jmpIfDynamic>=0?"":"CORRELATED "));








      nReg = pExpr->op==TK_SELECT ? pSel->pEList->nExpr : 1;
      sqlite3SelectDestInit(&dest, 0, pParse->nMem+1);
      pParse->nMem += nReg;
      if( pExpr->op==TK_SELECT ){
        dest.eDest = SRT_Mem;
        dest.iSdst = dest.iSDParm;
        dest.nSdst = nReg;
................................................................................

  assert( target>0 && target<=pParse->nMem );
  if( v==0 ){
    assert( pParse->db->mallocFailed );
    return 0;
  }

expr_code_doover:
  if( pExpr==0 ){
    op = TK_NULL;
  }else{
    op = pExpr->op;
  }
  switch( op ){
    case TK_AGG_COLUMN: {
................................................................................
    case TK_BETWEEN: {
      exprCodeBetween(pParse, pExpr, target, 0, 0);
      return target;
    }
    case TK_SPAN:
    case TK_COLLATE: 
    case TK_UPLUS: {
      pExpr = pExpr->pLeft;
      goto expr_code_doover;
    }

    case TK_TRIGGER: {
      /* If the opcode is TK_TRIGGER, then the expression is a reference
      ** to a column in the new.* or old.* pseudo-tables available to
      ** trigger programs. In this case Expr.iTable is set to 1 for the
      ** new.* pseudo-table, or 0 for the old.* pseudo-table. Expr.iColumn
................................................................................
  assert( pTab!=0 );
  assert( pParse->nErr==0 );
  if( sqlite3StrNICmp(pTab->zName, "sqlite_", 7)==0 
       && db->init.busy==0
#if SQLITE_USER_AUTHENTICATION
       && sqlite3UserAuthTable(pTab->zName)==0
#endif
#ifdef SQLITE_ALLOW_SQLITE_MASTER_INDEX
       && sqlite3StrICmp(&pTab->zName[7],"master")!=0
#endif
       && sqlite3StrNICmp(&pTab->zName[7],"altertab_",9)!=0
 ){
    sqlite3ErrorMsg(pParse, "table %s may not be indexed", pTab->zName);
    goto exit_create_index;
  }
#ifndef SQLITE_OMIT_VIEW
  if( pTab->pSelect ){
    sqlite3ErrorMsg(pParse, "views may not be indexed");
    goto exit_create_index;
................................................................................
  **    meta[9]   unused
  **
  ** Note: The #defined SQLITE_UTF* symbols in sqliteInt.h correspond to
  ** the possible values of meta[4].
  */
  for(i=0; i<ArraySize(meta); i++){
    sqlite3BtreeGetMeta(pDb->pBt, i+1, (u32 *)&meta[i]);
  }
  if( (db->flags & SQLITE_ResetDatabase)!=0 ){
    memset(meta, 0, sizeof(meta));
  }
  pDb->pSchema->schema_cookie = meta[BTREE_SCHEMA_VERSION-1];

  /* If opening a non-empty database, check the text encoding. For the
  ** main database, set sqlite3.enc to the encoding of the main database.
  ** For an attached db, it is an error if the encoding is not the same
  ** as sqlite3.enc.
................................................................................
  }
  rc = sParse.rc;

#ifndef SQLITE_OMIT_EXPLAIN
  if( rc==SQLITE_OK && sParse.pVdbe && sParse.explain ){
    static const char * const azColName[] = {
       "addr", "opcode", "p1", "p2", "p3", "p4", "p5", "comment",
       "id", "parent", "notused", "detail"
    };
    int iFirst, mx;
    if( sParse.explain==2 ){
      sqlite3VdbeSetNumCols(sParse.pVdbe, 4);
      iFirst = 8;
      mx = 12;
    }else{
................................................................................
/*
** Trace output macros
*/
#if SELECTTRACE_ENABLED
/***/ int sqlite3SelectTrace = 0;
# define SELECTTRACE(K,P,S,X)  \
  if(sqlite3SelectTrace&(K))   \
    sqlite3DebugPrintf("%s/%d/%p: ",(S)->zSelName,(P)->addrExplain,(S)),\
    sqlite3DebugPrintf X
#else
# define SELECTTRACE(K,P,S,X)
#endif


/*
................................................................................
  u8 nDefer;            /* Number of valid entries in aDefer[] */
  struct DeferredCsr {
    Table *pTab;        /* Table definition */
    int iCsr;           /* Cursor number for table */
    int nKey;           /* Number of PK columns for table pTab (>=1) */
  } aDefer[4];
#endif
  struct RowLoadInfo *pDeferredRowLoad;  /* Deferred row loading info or NULL */
};
#define SORTFLAG_UseSorter  0x01   /* Use SorterOpen instead of OpenEphemeral */

/*
** Delete all the content of a Select structure.  Deallocate the structure
** itself only if bFree is true.
*/
................................................................................
/* Forward reference */
static KeyInfo *keyInfoFromExprList(
  Parse *pParse,       /* Parsing context */
  ExprList *pList,     /* Form the KeyInfo object from this ExprList */
  int iStart,          /* Begin with this column of pList */
  int nExtra           /* Add this many extra columns to the end */
);

/*
** An instance of this object holds information (beyond pParse and pSelect)
** needed to load the next result row that is to be added to the sorter.
*/
typedef struct RowLoadInfo RowLoadInfo;
struct RowLoadInfo {
  int regResult;               /* Store results in array of registers here */
  u8 ecelFlags;                /* Flag argument to ExprCodeExprList() */
#ifdef SQLITE_ENABLE_SORTER_REFERENCES
  ExprList *pExtra;            /* Extra columns needed by sorter refs */
  int regExtraResult;          /* Where to load the extra columns */
#endif
};

/*
** This routine does the work of loading query data into an array of
** registers so that it can be added to the sorter.
*/
static void innerLoopLoadRow(
  Parse *pParse,             /* Statement under construction */
  Select *pSelect,           /* The query being coded */
  RowLoadInfo *pInfo         /* Info needed to complete the row load */
){
  sqlite3ExprCodeExprList(pParse, pSelect->pEList, pInfo->regResult,
                          0, pInfo->ecelFlags);
#ifdef SQLITE_ENABLE_SORTER_REFERENCES
  if( pInfo->pExtra ){
    sqlite3ExprCodeExprList(pParse, pInfo->pExtra, pInfo->regExtraResult, 0, 0);
    sqlite3ExprListDelete(pParse->db, pInfo->pExtra);
  }
#endif
}

/*
** Code the OP_MakeRecord instruction that generates the entry to be
** added into the sorter.
**
** Return the register in which the result is stored.
*/
static int makeSorterRecord(
  Parse *pParse,
  SortCtx *pSort,
  Select *pSelect,
  int regBase,
  int nBase
){
  int nOBSat = pSort->nOBSat;
  Vdbe *v = pParse->pVdbe;
  int regOut = ++pParse->nMem;
  if( pSort->pDeferredRowLoad ){
    innerLoopLoadRow(pParse, pSelect, pSort->pDeferredRowLoad);
  }
  sqlite3VdbeAddOp3(v, OP_MakeRecord, regBase+nOBSat, nBase-nOBSat, regOut);
  return regOut;
}

/*
** Generate code that will push the record in registers regData
** through regData+nData-1 onto the sorter.
*/
static void pushOntoSorter(
  Parse *pParse,         /* Parser context */
  SortCtx *pSort,        /* Information about the ORDER BY clause */
  Select *pSelect,       /* The whole SELECT statement */
  int regData,           /* First register holding data to be sorted */
  int regOrigData,       /* First register holding data before packing */
  int nData,             /* Number of elements in the regData data array */
  int nPrefixReg         /* No. of reg prior to regData available for use */
){
  Vdbe *v = pParse->pVdbe;                         /* Stmt under construction */
  int bSeq = ((pSort->sortFlags & SORTFLAG_UseSorter)==0);
  int nExpr = pSort->pOrderBy->nExpr;              /* No. of ORDER BY terms */
  int nBase = nExpr + bSeq + nData;                /* Fields in sorter record */
  int regBase;                                     /* Regs for sorter record */
  int regRecord = 0;                               /* Assembled sorter record */
  int nOBSat = pSort->nOBSat;                      /* ORDER BY terms to skip */
  int op;                            /* Opcode to add sorter record to sorter */
  int iLimit;                        /* LIMIT counter */
  int iSkip = 0;                     /* End of the sorter insert loop */

  assert( bSeq==0 || bSeq==1 );

  /* Three cases:
  **   (1) The data to be sorted has already been packed into a Record
  **       by a prior OP_MakeRecord.  In this case nData==1 and regData
  **       will be completely unrelated to regOrigData.
  **   (2) All output columns are included in the sort record.  In that
  **       case regData==regOrigData.
  **   (3) Some output columns are omitted from the sort record due to
  **       the SQLITE_ENABLE_SORTER_REFERENCE optimization, or due to the
  **       SQLITE_ECEL_OMITREF optimization.  In that case, regOrigData==0
  **       to prevent this routine from trying to copy values that might
  **       not exist.
  */
  assert( nData==1 || regData==regOrigData || regOrigData==0 );

  if( nPrefixReg ){
    assert( nPrefixReg==nExpr+bSeq );
    regBase = regData - nPrefixReg;
  }else{
    regBase = pParse->nMem + 1;
    pParse->nMem += nBase;
  }
  assert( pSelect->iOffset==0 || pSelect->iLimit!=0 );
  iLimit = pSelect->iOffset ? pSelect->iOffset+1 : pSelect->iLimit;
  pSort->labelDone = sqlite3VdbeMakeLabel(v);
................................................................................
    int regPrevKey;   /* The first nOBSat columns of the previous row */
    int addrFirst;    /* Address of the OP_IfNot opcode */
    int addrJmp;      /* Address of the OP_Jump opcode */
    VdbeOp *pOp;      /* Opcode that opens the sorter */
    int nKey;         /* Number of sorting key columns, including OP_Sequence */
    KeyInfo *pKI;     /* Original KeyInfo on the sorter table */

    regRecord = makeSorterRecord(pParse, pSort, pSelect, regBase, nBase);
    regPrevKey = pParse->nMem+1;
    pParse->nMem += pSort->nOBSat;
    nKey = nExpr - pSort->nOBSat + bSeq;
    if( bSeq ){
      addrFirst = sqlite3VdbeAddOp1(v, OP_IfNot, regBase+nExpr); 
    }else{
      addrFirst = sqlite3VdbeAddOp1(v, OP_SequenceTest, pSort->iECursor);
................................................................................
    ** If the new record does not need to be inserted into the sorter,
    ** jump to the next iteration of the loop. Or, if the
    ** pSort->bOrderedInnerLoop flag is set to indicate that the inner
    ** loop delivers items in sorted order, jump to the next iteration
    ** of the outer loop.
    */
    int iCsr = pSort->iECursor;


    sqlite3VdbeAddOp2(v, OP_IfNotZero, iLimit, sqlite3VdbeCurrentAddr(v)+4);
    VdbeCoverage(v);
    sqlite3VdbeAddOp2(v, OP_Last, iCsr, 0);
    iSkip = sqlite3VdbeAddOp4Int(v, OP_IdxLE,
                                 iCsr, 0, regBase+nOBSat, nExpr-nOBSat);
    VdbeCoverage(v);
    sqlite3VdbeAddOp1(v, OP_Delete, iCsr);
  }
  if( regRecord==0 ){
    regRecord = makeSorterRecord(pParse, pSort, pSelect, regBase, nBase);
  }
  if( pSort->sortFlags & SORTFLAG_UseSorter ){
    op = OP_SorterInsert;
  }else{
    op = OP_IdxInsert;
  }
  sqlite3VdbeAddOp4Int(v, op, pSort->iECursor, regRecord,
                       regBase+nOBSat, nBase-nOBSat);
  if( iSkip ){
    assert( pSort->bOrderedInnerLoop==0 || pSort->bOrderedInnerLoop==1 );
    sqlite3VdbeChangeP2(v, iSkip,
         sqlite3VdbeCurrentAddr(v) + pSort->bOrderedInnerLoop);
  }
}

/*
** Add code to implement the OFFSET
*/
static void codeOffset(
  Vdbe *v,          /* Generate code into this VM */
................................................................................
  for(i=0; i<pEList->nExpr; i++){
    struct ExprList_item *pItem = &pEList->a[i];
    if( pItem->u.x.iOrderByCol==0 ){
      Expr *pExpr = pItem->pExpr;
      Table *pTab = pExpr->pTab;
      if( pExpr->op==TK_COLUMN && pTab && !IsVirtual(pTab)
       && (pTab->aCol[pExpr->iColumn].colFlags & COLFLAG_SORTERREF)



      ){
        int j;
        for(j=0; j<nDefer; j++){
          if( pSort->aDefer[j].iCsr==pExpr->iTable ) break;
        }
        if( j==nDefer ){
          if( nDefer==ArraySize(pSort->aDefer) ){
................................................................................
  Vdbe *v = pParse->pVdbe;
  int i;
  int hasDistinct;            /* True if the DISTINCT keyword is present */
  int eDest = pDest->eDest;   /* How to dispose of results */
  int iParm = pDest->iSDParm; /* First argument to disposal method */
  int nResultCol;             /* Number of result columns */
  int nPrefixReg = 0;         /* Number of extra registers before regResult */
  RowLoadInfo sRowLoadInfo;   /* Info for deferred row loading */

  /* Usually, regResult is the first cell in an array of memory cells
  ** containing the current result row. In this case regOrig is set to the
  ** same value. However, if the results are being sent to the sorter, the
  ** values for any expressions that are also part of the sort-key are omitted
  ** from this array. In this case regOrig is set to zero.  */
  int regResult;              /* Start of memory holding current results */
................................................................................
  }else if( eDest!=SRT_Exists ){
#ifdef SQLITE_ENABLE_SORTER_REFERENCES
    ExprList *pExtra = 0;
#endif
    /* If the destination is an EXISTS(...) expression, the actual
    ** values returned by the SELECT are not required.
    */
    u8 ecelFlags;    /* "ecel" is an abbreviation of "ExprCodeExprList" */
    ExprList *pEList;
    if( eDest==SRT_Mem || eDest==SRT_Output || eDest==SRT_Coroutine ){
      ecelFlags = SQLITE_ECEL_DUP;
    }else{
      ecelFlags = 0;
    }
    if( pSort && hasDistinct==0 && eDest!=SRT_EphemTab && eDest!=SRT_Table ){
      /* For each expression in p->pEList that is a copy of an expression in
      ** the ORDER BY clause (pSort->pOrderBy), set the associated 
      ** iOrderByCol value to one more than the index of the ORDER BY 
      ** expression within the sort-key that pushOntoSorter() will generate.
      ** This allows the p->pEList field to be omitted from the sorted record,
      ** saving space and CPU cycles.  */
      ecelFlags |= (SQLITE_ECEL_OMITREF|SQLITE_ECEL_REF);

      for(i=pSort->nOBSat; i<pSort->pOrderBy->nExpr; i++){
        int j;
        if( (j = pSort->pOrderBy->a[i].u.x.iOrderByCol)>0 ){
          p->pEList->a[j-1].u.x.iOrderByCol = i+1-pSort->nOBSat;
        }
      }
#ifdef SQLITE_ENABLE_SORTER_REFERENCES
................................................................................
        ** composite primary keys in the SortCtx.aDefer[] array.  */
        VdbeOp *pOp = sqlite3VdbeGetOp(v, pSort->addrSortIndex);
        pOp->p2 += (pExtra->nExpr - pSort->nDefer);
        pOp->p4.pKeyInfo->nAllField += (pExtra->nExpr - pSort->nDefer);
        pParse->nMem += pExtra->nExpr;
      }
#endif

      /* Adjust nResultCol to account for columns that are omitted
      ** from the sorter by the optimizations in this branch */
      pEList = p->pEList;
      for(i=0; i<pEList->nExpr; i++){
        if( pEList->a[i].u.x.iOrderByCol>0
#ifdef SQLITE_ENABLE_SORTER_REFERENCES
         || pEList->a[i].bSorterRef
#endif
        ){
          nResultCol--;
          regOrig = 0;
        }
      }

      testcase( regOrig );
      testcase( eDest==SRT_Set );
      testcase( eDest==SRT_Mem );
      testcase( eDest==SRT_Coroutine );
      testcase( eDest==SRT_Output );
      assert( eDest==SRT_Set || eDest==SRT_Mem 
           || eDest==SRT_Coroutine || eDest==SRT_Output );
    }

    sRowLoadInfo.regResult = regResult;
    sRowLoadInfo.ecelFlags = ecelFlags;
#ifdef SQLITE_ENABLE_SORTER_REFERENCES
    sRowLoadInfo.pExtra = pExtra;
    sRowLoadInfo.regExtraResult = regResult + nResultCol;
    if( pExtra ) nResultCol += pExtra->nExpr;


#endif
    if( p->iLimit
     && (ecelFlags & SQLITE_ECEL_OMITREF)!=0 
     && nPrefixReg>0
    ){

      assert( pSort!=0 );
      assert( hasDistinct==0 );
      pSort->pDeferredRowLoad = &sRowLoadInfo;
    }else{
      innerLoopLoadRow(pParse, p, &sRowLoadInfo);
    }

  }

  /* If the DISTINCT keyword was present on the SELECT statement
  ** and this row has been seen before, then do not make this row
  ** part of the result.
  */
  if( hasDistinct ){
................................................................................
        sqlite3VdbeAddOp4Int(v, OP_Found, iParm+1, addr, r1, 0);
        VdbeCoverage(v);
        sqlite3VdbeAddOp4Int(v, OP_IdxInsert, iParm+1, r1,regResult,nResultCol);
        assert( pSort==0 );
      }
#endif
      if( pSort ){
        assert( regResult==regOrig );
        pushOntoSorter(pParse, pSort, p, r1+nPrefixReg, regOrig, 1, nPrefixReg);
      }else{
        int r2 = sqlite3GetTempReg(pParse);
        sqlite3VdbeAddOp2(v, OP_NewRowid, iParm, r2);
        sqlite3VdbeAddOp3(v, OP_Insert, iParm, r1, r2);
        sqlite3VdbeChangeP5(v, OPFLAG_APPEND);
        sqlite3ReleaseTempReg(pParse, r2);
      }
................................................................................
**
**   "USE TEMP B-TREE FOR xxx"
**
** where xxx is one of "DISTINCT", "ORDER BY" or "GROUP BY". Exactly which
** is determined by the zUsage argument.
*/
static void explainTempTable(Parse *pParse, const char *zUsage){


  ExplainQueryPlan((pParse, 0, "USE TEMP B-TREE FOR %s", zUsage));


}

/*
** Assign expression b to lvalue a. A second, no-op, version of this macro
** is provided when SQLITE_OMIT_EXPLAIN is defined. This allows the code
** in sqlite3Select() to assign values to structure member variables that
** only exist if SQLITE_OMIT_EXPLAIN is not defined without polluting the
................................................................................

#else
/* No-op versions of the explainXXX() functions and macros. */
# define explainTempTable(y,z)
# define explainSetInteger(y,z)
#endif






































/*
** If the inner loop was generated using a non-null pOrderBy argument,
** then the results were placed in a sorter.  After the loop is terminated
** we need to run the sorter and output the results.  The following
** routine generates the code needed to do that.
*/
................................................................................
#ifndef SQLITE_OMIT_EXPLAIN
  /* If this is an EXPLAIN, skip this step */
  if( pParse->explain ){
    return;
  }
#endif

  if( pParse->colNamesSet ) return;
  /* Column names are determined by the left-most term of a compound select */
  while( pSelect->pPrior ) pSelect = pSelect->pPrior;
  SELECTTRACE(1,pParse,pSelect,("generating column names\n"));
  pTabList = pSelect->pSrc;
  pEList = pSelect->pEList;
  assert( v!=0 );
  assert( pTabList!=0 );
................................................................................
  }

  /* Detach the ORDER BY clause from the compound SELECT */
  p->pOrderBy = 0;

  /* Store the results of the setup-query in Queue. */
  pSetup->pNext = 0;
  ExplainQueryPlan((pParse, 1, "SETUP"));
  rc = sqlite3Select(pParse, pSetup, &destQueue);
  pSetup->pNext = p;
  if( rc ) goto end_of_recursive_query;

  /* Find the next row in the Queue and output that row */
  addrTop = sqlite3VdbeAddOp2(v, OP_Rewind, iQueue, addrBreak); VdbeCoverage(v);

................................................................................
  /* Execute the recursive SELECT taking the single row in Current as
  ** the value for the recursive-table. Store the results in the Queue.
  */
  if( p->selFlags & SF_Aggregate ){
    sqlite3ErrorMsg(pParse, "recursive aggregate queries not supported");
  }else{
    p->pPrior = 0;
    ExplainQueryPlan((pParse, 1, "RECURSIVE STEP"));
    sqlite3Select(pParse, p, &destQueue);
    assert( p->pPrior==0 );
    p->pPrior = pSetup;
  }

  /* Keep running the loop until the Queue is empty */
  sqlite3VdbeGoto(v, addrTop);
................................................................................
** Since the limit is exactly 1, we only need to evalutes the left-most VALUES.
*/
static int multiSelectValues(
  Parse *pParse,        /* Parsing context */
  Select *p,            /* The right-most of SELECTs to be coded */
  SelectDest *pDest     /* What to do with query results */
){


  int nRow = 1;
  int rc = 0;
  int bShowAll = p->pLimit==0;
  assert( p->selFlags & SF_MultiValue );
  do{
    assert( p->selFlags & SF_Values );
    assert( p->op==TK_ALL || (p->op==TK_SELECT && p->pPrior==0) );
    assert( p->pNext==0 || p->pEList->nExpr==p->pNext->pEList->nExpr );
    if( p->pPrior==0 ) break;
    assert( p->pPrior->pNext==p );
    p = p->pPrior;
    nRow += bShowAll;
  }while(1);
  ExplainQueryPlan((pParse, 0, "SCAN %d CONSTANT ROW%s", nRow,
                    nRow==1 ? "" : "S"));
  while( p ){


    selectInnerLoop(pParse, p, -1, 0, 0, pDest, 1, 1);
    if( !bShowAll ) break;

    p->nSelectRow = nRow;
    p = p->pNext;
  }
  return rc;
}

/*
................................................................................
){
  int rc = SQLITE_OK;   /* Success code from a subroutine */
  Select *pPrior;       /* Another SELECT immediately to our left */
  Vdbe *v;              /* Generate code to this VDBE */
  SelectDest dest;      /* Alternative data destination */
  Select *pDelete = 0;  /* Chain of simple selects to delete */
  sqlite3 *db;          /* Database connection */





  /* Make sure there is no ORDER BY or LIMIT clause on prior SELECTs.  Only
  ** the last (right-most) SELECT in the series may have an ORDER BY or LIMIT.
  */
  assert( p && p->pPrior );  /* Calling function guarantees this much */
  assert( (p->selFlags & SF_Recursive)==0 || p->op==TK_ALL || p->op==TK_UNION );
  db = pParse->db;
................................................................................
  }else
#endif

  /* Compound SELECTs that have an ORDER BY clause are handled separately.
  */
  if( p->pOrderBy ){
    return multiSelectOrderBy(pParse, p, pDest);
  }else{

#ifndef SQLITE_OMIT_EXPLAIN
    if( pPrior->pPrior==0 ){
      ExplainQueryPlan((pParse, 1, "COMPOUND QUERY"));
      ExplainQueryPlan((pParse, 1, "LEFT-MOST SUBQUERY"));
    }
#endif

    /* Generate code for the left and right SELECT statements.
    */
    switch( p->op ){
      case TK_ALL: {
        int addr = 0;
        int nLimit;
        assert( !pPrior->pLimit );
        pPrior->iLimit = p->iLimit;
        pPrior->iOffset = p->iOffset;
        pPrior->pLimit = p->pLimit;

        rc = sqlite3Select(pParse, pPrior, &dest);
        p->pLimit = 0;
        if( rc ){
          goto multi_select_end;
        }
        p->pPrior = 0;
        p->iLimit = pPrior->iLimit;
        p->iOffset = pPrior->iOffset;
        if( p->iLimit ){
          addr = sqlite3VdbeAddOp1(v, OP_IfNot, p->iLimit); VdbeCoverage(v);
          VdbeComment((v, "Jump ahead if LIMIT reached"));
          if( p->iOffset ){
            sqlite3VdbeAddOp3(v, OP_OffsetLimit,
                              p->iLimit, p->iOffset+1, p->iOffset);
          }
        }

        ExplainQueryPlan((pParse, 1, "UNION ALL"));
        rc = sqlite3Select(pParse, p, &dest);
        testcase( rc!=SQLITE_OK );
        pDelete = p->pPrior;
        p->pPrior = pPrior;
        p->nSelectRow = sqlite3LogEstAdd(p->nSelectRow, pPrior->nSelectRow);
        if( pPrior->pLimit
         && sqlite3ExprIsInteger(pPrior->pLimit->pLeft, &nLimit)
         && nLimit>0 && p->nSelectRow > sqlite3LogEst((u64)nLimit) 
        ){
          p->nSelectRow = sqlite3LogEst((u64)nLimit);
        }
        if( addr ){
          sqlite3VdbeJumpHere(v, addr);
        }
        break;
      }
      case TK_EXCEPT:
      case TK_UNION: {
        int unionTab;    /* Cursor number of the temp table holding result */
        u8 op = 0;       /* One of the SRT_ operations to apply to self */
        int priorOp;     /* The SRT_ operation to apply to prior selects */
        Expr *pLimit;    /* Saved values of p->nLimit  */
        int addr;
        SelectDest uniondest;
  
        testcase( p->op==TK_EXCEPT );
        testcase( p->op==TK_UNION );
        priorOp = SRT_Union;
        if( dest.eDest==priorOp ){
          /* We can reuse a temporary table generated by a SELECT to our
          ** right.
          */
          assert( p->pLimit==0 );      /* Not allowed on leftward elements */
          unionTab = dest.iSDParm;
        }else{
          /* We will need to create our own temporary table to hold the
          ** intermediate results.
          */
          unionTab = pParse->nTab++;
          assert( p->pOrderBy==0 );
          addr = sqlite3VdbeAddOp2(v, OP_OpenEphemeral, unionTab, 0);
          assert( p->addrOpenEphm[0] == -1 );
          p->addrOpenEphm[0] = addr;
          findRightmost(p)->selFlags |= SF_UsesEphemeral;
          assert( p->pEList );
        }
  
        /* Code the SELECT statements to our left
        */
        assert( !pPrior->pOrderBy );
        sqlite3SelectDestInit(&uniondest, priorOp, unionTab);

        rc = sqlite3Select(pParse, pPrior, &uniondest);
        if( rc ){
          goto multi_select_end;
        }
  
        /* Code the current SELECT statement
        */
        if( p->op==TK_EXCEPT ){
          op = SRT_Except;
        }else{
          assert( p->op==TK_UNION );
          op = SRT_Union;
        }
        p->pPrior = 0;
        pLimit = p->pLimit;
        p->pLimit = 0;
        uniondest.eDest = op;

        ExplainQueryPlan((pParse, 1, "%s USING TEMP B-TREE",
                          selectOpName(p->op)));
        rc = sqlite3Select(pParse, p, &uniondest);
        testcase( rc!=SQLITE_OK );
        /* Query flattening in sqlite3Select() might refill p->pOrderBy.
        ** Be sure to delete p->pOrderBy, therefore, to avoid a memory leak. */
        sqlite3ExprListDelete(db, p->pOrderBy);
        pDelete = p->pPrior;
        p->pPrior = pPrior;
        p->pOrderBy = 0;
        if( p->op==TK_UNION ){
          p->nSelectRow = sqlite3LogEstAdd(p->nSelectRow, pPrior->nSelectRow);
        }
        sqlite3ExprDelete(db, p->pLimit);
        p->pLimit = pLimit;
        p->iLimit = 0;
        p->iOffset = 0;
  
        /* Convert the data in the temporary table into whatever form
        ** it is that we currently need.
        */
        assert( unionTab==dest.iSDParm || dest.eDest!=priorOp );
        if( dest.eDest!=priorOp ){
          int iCont, iBreak, iStart;
          assert( p->pEList );
          iBreak = sqlite3VdbeMakeLabel(v);
          iCont = sqlite3VdbeMakeLabel(v);
          computeLimitRegisters(pParse, p, iBreak);
          sqlite3VdbeAddOp2(v, OP_Rewind, unionTab, iBreak); VdbeCoverage(v);
          iStart = sqlite3VdbeCurrentAddr(v);
          selectInnerLoop(pParse, p, unionTab,
                          0, 0, &dest, iCont, iBreak);
          sqlite3VdbeResolveLabel(v, iCont);
          sqlite3VdbeAddOp2(v, OP_Next, unionTab, iStart); VdbeCoverage(v);
          sqlite3VdbeResolveLabel(v, iBreak);
          sqlite3VdbeAddOp2(v, OP_Close, unionTab, 0);
        }
        break;
      }
      default: assert( p->op==TK_INTERSECT ); {
        int tab1, tab2;
        int iCont, iBreak, iStart;
        Expr *pLimit;
        int addr;
        SelectDest intersectdest;
        int r1;
  
        /* INTERSECT is different from the others since it requires
        ** two temporary tables.  Hence it has its own case.  Begin
        ** by allocating the tables we will need.
        */
        tab1 = pParse->nTab++;
        tab2 = pParse->nTab++;
        assert( p->pOrderBy==0 );
  
        addr = sqlite3VdbeAddOp2(v, OP_OpenEphemeral, tab1, 0);
        assert( p->addrOpenEphm[0] == -1 );
        p->addrOpenEphm[0] = addr;
        findRightmost(p)->selFlags |= SF_UsesEphemeral;
        assert( p->pEList );
  
        /* Code the SELECTs to our left into temporary table "tab1".
        */
        sqlite3SelectDestInit(&intersectdest, SRT_Union, tab1);

        rc = sqlite3Select(pParse, pPrior, &intersectdest);
        if( rc ){
          goto multi_select_end;
        }
  
        /* Code the current SELECT into temporary table "tab2"
        */
        addr = sqlite3VdbeAddOp2(v, OP_OpenEphemeral, tab2, 0);
        assert( p->addrOpenEphm[1] == -1 );
        p->addrOpenEphm[1] = addr;
        p->pPrior = 0;
        pLimit = p->pLimit;
        p->pLimit = 0;
        intersectdest.iSDParm = tab2;

        ExplainQueryPlan((pParse, 1, "%s USING TEMP B-TREE",
                          selectOpName(p->op)));
        rc = sqlite3Select(pParse, p, &intersectdest);
        testcase( rc!=SQLITE_OK );
        pDelete = p->pPrior;
        p->pPrior = pPrior;
        if( p->nSelectRow>pPrior->nSelectRow ){
          p->nSelectRow = pPrior->nSelectRow;
        }
        sqlite3ExprDelete(db, p->pLimit);
        p->pLimit = pLimit;
  
        /* Generate code to take the intersection of the two temporary
        ** tables.
        */
        assert( p->pEList );
        iBreak = sqlite3VdbeMakeLabel(v);
        iCont = sqlite3VdbeMakeLabel(v);
        computeLimitRegisters(pParse, p, iBreak);
        sqlite3VdbeAddOp2(v, OP_Rewind, tab1, iBreak); VdbeCoverage(v);
        r1 = sqlite3GetTempReg(pParse);
        iStart = sqlite3VdbeAddOp2(v, OP_RowData, tab1, r1);
        sqlite3VdbeAddOp4Int(v, OP_NotFound, tab2, iCont, r1, 0);
        VdbeCoverage(v);
        sqlite3ReleaseTempReg(pParse, r1);
        selectInnerLoop(pParse, p, tab1,
                        0, 0, &dest, iCont, iBreak);
        sqlite3VdbeResolveLabel(v, iCont);
        sqlite3VdbeAddOp2(v, OP_Next, tab1, iStart); VdbeCoverage(v);
        sqlite3VdbeResolveLabel(v, iBreak);
        sqlite3VdbeAddOp2(v, OP_Close, tab2, 0);
        sqlite3VdbeAddOp2(v, OP_Close, tab1, 0);
        break;
      }
    }
  

  #ifndef SQLITE_OMIT_EXPLAIN
    if( p->pNext==0 ){
      ExplainQueryPlanPop(pParse);
    }
  #endif
  }
  
  /* Compute collating sequences used by 
  ** temporary tables needed to implement the compound select.
  ** Attach the KeyInfo structure to all temporary tables.
  **
  ** This section is run by the right-most SELECT statement only.
  ** SELECT statements to the left always skip this part.  The right-most
  ** SELECT might also skip this part if it has no ORDER BY clause and
................................................................................
  int op;               /* One of TK_ALL, TK_UNION, TK_EXCEPT, TK_INTERSECT */
  KeyInfo *pKeyDup = 0; /* Comparison information for duplicate removal */
  KeyInfo *pKeyMerge;   /* Comparison information for merging rows */
  sqlite3 *db;          /* Database connection */
  ExprList *pOrderBy;   /* The ORDER BY clause */
  int nOrderBy;         /* Number of terms in the ORDER BY clause */
  int *aPermute;        /* Mapping from ORDER BY terms to result set columns */





  assert( p->pOrderBy!=0 );
  assert( pKeyDup==0 ); /* "Managed" code needs this.  Ticket #3382. */
  db = pParse->db;
  v = pParse->pVdbe;
  assert( v!=0 );       /* Already thrown the error if VDBE alloc failed */
  labelEnd = sqlite3VdbeMakeLabel(v);
................................................................................
  regAddrA = ++pParse->nMem;
  regAddrB = ++pParse->nMem;
  regOutA = ++pParse->nMem;
  regOutB = ++pParse->nMem;
  sqlite3SelectDestInit(&destA, SRT_Coroutine, regAddrA);
  sqlite3SelectDestInit(&destB, SRT_Coroutine, regAddrB);

  ExplainQueryPlan((pParse, 1, "MERGE (%s)", selectOpName(p->op)));

  /* Generate a coroutine to evaluate the SELECT statement to the
  ** left of the compound operator - the "A" select.
  */
  addrSelectA = sqlite3VdbeCurrentAddr(v) + 1;
  addr1 = sqlite3VdbeAddOp3(v, OP_InitCoroutine, regAddrA, 0, addrSelectA);
  VdbeComment((v, "left SELECT"));
  pPrior->iLimit = regLimitA;
  ExplainQueryPlan((pParse, 1, "LEFT"));
  sqlite3Select(pParse, pPrior, &destA);
  sqlite3VdbeEndCoroutine(v, regAddrA);
  sqlite3VdbeJumpHere(v, addr1);

  /* Generate a coroutine to evaluate the SELECT statement on 
  ** the right - the "B" select
  */
................................................................................
  addrSelectB = sqlite3VdbeCurrentAddr(v) + 1;
  addr1 = sqlite3VdbeAddOp3(v, OP_InitCoroutine, regAddrB, 0, addrSelectB);
  VdbeComment((v, "right SELECT"));
  savedLimit = p->iLimit;
  savedOffset = p->iOffset;
  p->iLimit = regLimitB;
  p->iOffset = 0;  
  ExplainQueryPlan((pParse, 1, "RIGHT"));
  sqlite3Select(pParse, p, &destB);
  p->iLimit = savedLimit;
  p->iOffset = savedOffset;
  sqlite3VdbeEndCoroutine(v, regAddrB);

  /* Generate a subroutine that outputs the current row of the A
  ** select as the next output row of the compound select.
................................................................................
    sqlite3SelectDelete(db, p->pPrior);
  }
  p->pPrior = pPrior;
  pPrior->pNext = p;

  /*** TBD:  Insert subroutine calls to close cursors on incomplete
  **** subqueries ****/
  ExplainQueryPlanPop(pParse);
  return pParse->nErr!=0;
}
#endif

#if !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW)

/* An instance of the SubstContext object describes an substitution edit
................................................................................
static void explainSimpleCount(
  Parse *pParse,                  /* Parse context */
  Table *pTab,                    /* Table being queried */
  Index *pIdx                     /* Index used to optimize scan, or NULL */
){
  if( pParse->explain==2 ){
    int bCover = (pIdx!=0 && (HasRowid(pTab) || !IsPrimaryKeyIndex(pIdx)));
    sqlite3VdbeExplain(pParse, 0, "SCAN TABLE %s%s%s",
        pTab->zName,
        bCover ? " USING COVERING INDEX " : "",
        bCover ? pIdx->zName : ""
    );



  }
}
#else
# define explainSimpleCount(a,b,c)
#endif

/*
................................................................................
  SortCtx sSort;         /* Info on how to code the ORDER BY clause */
  AggInfo sAggInfo;      /* Information used by aggregate queries */
  int iEnd;              /* Address of the end of the query */
  sqlite3 *db;           /* The database connection */
  ExprList *pMinMaxOrderBy = 0;  /* Added ORDER BY for min/max queries */
  u8 minMaxFlag;                 /* Flag for min/max queries */






  db = pParse->db;
  v = sqlite3GetVdbe(pParse);
  if( p==0 || db->mallocFailed || pParse->nErr ){
    return 1;
  }
  if( sqlite3AuthCheck(pParse, SQLITE_SELECT, 0, 0, 0) ) return 1;
  memset(&sAggInfo, 0, sizeof(sAggInfo));
#if SELECTTRACE_ENABLED



  SELECTTRACE(1,pParse,p, ("begin processing:\n", pParse->addrExplain));
  if( sqlite3SelectTrace & 0x100 ){
    sqlite3TreeViewSelect(0, p, 0);
  }
#endif

  assert( p->pOrderBy==0 || pDest->eDest!=SRT_DistFifo );
  assert( p->pOrderBy==0 || pDest->eDest!=SRT_Fifo );
................................................................................
#if SELECTTRACE_ENABLED
  if( sqlite3SelectTrace & 0x104 ){
    SELECTTRACE(0x104,pParse,p, ("after name resolution:\n"));
    sqlite3TreeViewSelect(0, p, 0);
  }
#endif





  if( pDest->eDest==SRT_Output ){
    generateColumnNames(pParse, p);
  }

  /* Try to various optimizations (flattening subqueries, and strength
  ** reduction of join operators) in the FROM clause up into the main query
  */
................................................................................
  /* Handle compound SELECT statements using the separate multiSelect()
  ** procedure.
  */
  if( p->pPrior ){
    rc = multiSelect(pParse, p, pDest);
#if SELECTTRACE_ENABLED
    SELECTTRACE(0x1,pParse,p,("end compound-select processing\n"));
    if( (sqlite3SelectTrace & 0x2000)!=0 && ExplainQueryPlanParent(pParse)==0 ){
      sqlite3TreeViewSelect(0, p, 0);
    }
#endif
    if( p->pNext==0 ) ExplainQueryPlanPop(pParse);
    return rc;
  }
#endif

  /* For each term in the FROM clause, do two things:
  ** (1) Authorized unreferenced tables
  ** (2) Generate code for all sub-queries
................................................................................
      int addrTop = sqlite3VdbeCurrentAddr(v)+1;
     
      pItem->regReturn = ++pParse->nMem;
      sqlite3VdbeAddOp3(v, OP_InitCoroutine, pItem->regReturn, 0, addrTop);
      VdbeComment((v, "%s", pItem->pTab->zName));
      pItem->addrFillSub = addrTop;
      sqlite3SelectDestInit(&dest, SRT_Coroutine, pItem->regReturn);
      ExplainQueryPlan((pParse, 1, "CO-ROUTINE 0x%p", pSub));
      sqlite3Select(pParse, pSub, &dest);
      pItem->pTab->nRowLogEst = pSub->nSelectRow;
      pItem->fg.viaCoroutine = 1;
      pItem->regResult = dest.iSdst;
      sqlite3VdbeEndCoroutine(v, pItem->regReturn);
      sqlite3VdbeJumpHere(v, addrTop-1);
      sqlite3ClearTempRegCache(pParse);
................................................................................
        VdbeComment((v, "materialize \"%s\"", pItem->pTab->zName));
      }else{
        VdbeNoopComment((v, "materialize \"%s\"", pItem->pTab->zName));
      }
      pPrior = isSelfJoinView(pTabList, pItem);
      if( pPrior ){
        sqlite3VdbeAddOp2(v, OP_OpenDup, pItem->iCursor, pPrior->iCursor);

        assert( pPrior->pSelect!=0 );
        pSub->nSelectRow = pPrior->pSelect->nSelectRow;
      }else{
        sqlite3SelectDestInit(&dest, SRT_EphemTab, pItem->iCursor);
        ExplainQueryPlan((pParse, 1, "MATERIALIZE 0x%p", pSub));
        sqlite3Select(pParse, pSub, &dest);
      }
      pItem->pTab->nRowLogEst = pSub->nSelectRow;
      if( onceAddr ) sqlite3VdbeJumpHere(v, onceAddr);
      retAddr = sqlite3VdbeAddOp1(v, OP_Return, pItem->regReturn);
      VdbeComment((v, "end %s", pItem->pTab->zName));
      sqlite3VdbeChangeP1(v, topAddr, retAddr);
................................................................................
  */
select_end:
  sqlite3ExprListDelete(db, pMinMaxOrderBy);
  sqlite3DbFree(db, sAggInfo.aCol);
  sqlite3DbFree(db, sAggInfo.aFunc);
#if SELECTTRACE_ENABLED
  SELECTTRACE(0x1,pParse,p,("end processing\n"));
  if( (sqlite3SelectTrace & 0x2000)!=0 && ExplainQueryPlanParent(pParse)==0 ){
    sqlite3TreeViewSelect(0, p, 0);
  }
#endif
  ExplainQueryPlanPop(pParse);
  return rc;
}

/************** End of select.c **********************************************/
/************** Begin file table.c *******************************************/
/*
** 2001 September 15
................................................................................

  /* printf("SQL: [%s]\n", zSql); fflush(stdout); */
  rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0);
  if( rc!=SQLITE_OK ) return rc;
  while( SQLITE_ROW==(rc = sqlite3_step(pStmt)) ){
    const char *zSubSql = (const char*)sqlite3_column_text(pStmt,0);
    assert( sqlite3_strnicmp(zSql,"SELECT",6)==0 );
    /* The secondary SQL must be one of CREATE TABLE, CREATE INDEX,
    ** or INSERT.  Historically there have been attacks that first
    ** corrupt the sqlite_master.sql field with other kinds of statements
    ** then run VACUUM to get those statements to execute at inappropriate
    ** times. */
    if( zSubSql
     && (strncmp(zSubSql,"CRE",3)==0 || strncmp(zSubSql,"INS",3)==0)
    ){
      rc = execSql(db, pzErrMsg, zSubSql);
      if( rc!=SQLITE_OK ) break;
    }
  }
  assert( rc!=SQLITE_ROW );
  if( rc==SQLITE_DONE ) rc = SQLITE_OK;
  if( rc ){
................................................................................
      " WHERE type='table'AND name<>'sqlite_sequence'"
      " AND coalesce(rootpage,1)>0",
      zDbMain
  );
  if( rc!=SQLITE_OK ) goto end_of_vacuum;
  rc = execSqlF(db, pzErrMsg,
      "SELECT sql FROM \"%w\".sqlite_master"
      " WHERE type='index'",
      zDbMain
  );
  if( rc!=SQLITE_OK ) goto end_of_vacuum;
  db->init.iDb = 0;

  /* Loop through the tables in the main database. For each, do
  ** an "INSERT INTO vacuum_db.xxx SELECT * FROM main.xxx;" to copy
................................................................................
#if !defined(SQLITE_DEBUG) && !defined(SQLITE_ENABLE_STMT_SCANSTATUS)
  if( sqlite3ParseToplevel(pParse)->explain==2 )
#endif
  {
    struct SrcList_item *pItem = &pTabList->a[pLevel->iFrom];
    Vdbe *v = pParse->pVdbe;      /* VM being constructed */
    sqlite3 *db = pParse->db;     /* Database handle */

    int isSearch;                 /* True for a SEARCH. False for SCAN. */
    WhereLoop *pLoop;             /* The controlling WhereLoop object */
    u32 flags;                    /* Flags that describe this loop */
    char *zMsg;                   /* Text to add to EQP output */
    StrAccum str;                 /* EQP output string */
    char zBuf[100];               /* Initial space for EQP output string */

................................................................................
    isSearch = (flags&(WHERE_BTM_LIMIT|WHERE_TOP_LIMIT))!=0
            || ((flags&WHERE_VIRTUALTABLE)==0 && (pLoop->u.btree.nEq>0))
            || (wctrlFlags&(WHERE_ORDERBY_MIN|WHERE_ORDERBY_MAX));

    sqlite3StrAccumInit(&str, db, zBuf, sizeof(zBuf), SQLITE_MAX_LENGTH);
    sqlite3StrAccumAppendAll(&str, isSearch ? "SEARCH" : "SCAN");
    if( pItem->pSelect ){
      sqlite3XPrintf(&str, " SUBQUERY 0x%p", pItem->pSelect);
    }else{
      sqlite3XPrintf(&str, " TABLE %s", pItem->zName);
    }

    if( pItem->zAlias ){
      sqlite3XPrintf(&str, " AS %s", pItem->zAlias);
    }
................................................................................
    if( pLoop->nOut>=10 ){
      sqlite3XPrintf(&str, " (~%llu rows)", sqlite3LogEstToInt(pLoop->nOut));
    }else{
      sqlite3StrAccumAppend(&str, " (~1 row)", 9);
    }
#endif
    zMsg = sqlite3StrAccumFinish(&str);
    ret = sqlite3VdbeAddOp4(v, OP_Explain, sqlite3VdbeCurrentAddr(v),
                            pParse->addrExplain, 0, zMsg,P4_DYNAMIC);
  }
  return ret;
}
#endif /* SQLITE_OMIT_EXPLAIN */

#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
/*
................................................................................
    }

    /* Run a separate WHERE clause for each term of the OR clause.  After
    ** eliminating duplicates from other WHERE clauses, the action for each
    ** sub-WHERE clause is to to invoke the main loop body as a subroutine.
    */
    wctrlFlags =  WHERE_OR_SUBCLAUSE | (pWInfo->wctrlFlags & WHERE_SEEK_TABLE);
    ExplainQueryPlan((pParse, 1, "MULTI-INDEX OR"));
    for(ii=0; ii<pOrWc->nTerm; ii++){
      WhereTerm *pOrTerm = &pOrWc->a[ii];
      if( pOrTerm->leftCursor==iCur || (pOrTerm->eOperator & WO_AND)!=0 ){
        WhereInfo *pSubWInfo;           /* Info for single OR-term scan */
        Expr *pOrExpr = pOrTerm->pExpr; /* Current OR clause term */
        int jmp1 = 0;                   /* Address of jump operation */
        assert( (pTabItem[0].fg.jointype & JT_LEFT)==0 
................................................................................
          }

          /* Finish the loop through table entries that match term pOrTerm. */
          sqlite3WhereEnd(pSubWInfo);
        }
      }
    }
    ExplainQueryPlanPop(pParse);
    pLevel->u.pCovidx = pCov;
    if( pCov ) pLevel->iIdxCur = iCovCur;
    if( pAndExpr ){
      pAndExpr->pLeft = 0;
      sqlite3ExprDelete(db, pAndExpr);
    }
    sqlite3VdbeChangeP1(v, iRetInit, sqlite3VdbeCurrentAddr(v));
................................................................................
  /* Special case: No FROM clause
  */
  if( nTabList==0 ){
    if( pOrderBy ) pWInfo->nOBSat = pOrderBy->nExpr;
    if( wctrlFlags & WHERE_WANT_DISTINCT ){
      pWInfo->eDistinct = WHERE_DISTINCT_UNIQUE;
    }
    ExplainQueryPlan((pParse, 0, "SCAN CONSTANT ROW"));
  }else{
    /* Assign a bit from the bitmask to every term in the FROM clause.
    **
    ** The N-th term of the FROM clause is assigned a bitmask of 1<<N.
    **
    ** The rule of the previous sentence ensures thta if X is the bitmask for
    ** a table T, then X-1 is the bitmask for all other tables to the left of T.
................................................................................
        { SQLITE_DBCONFIG_ENABLE_FKEY,           SQLITE_ForeignKeys    },
        { SQLITE_DBCONFIG_ENABLE_TRIGGER,        SQLITE_EnableTrigger  },
        { SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER, SQLITE_Fts3Tokenizer  },
        { SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION, SQLITE_LoadExtension  },
        { SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE,      SQLITE_NoCkptOnClose  },
        { SQLITE_DBCONFIG_ENABLE_QPSG,           SQLITE_EnableQPSG     },
        { SQLITE_DBCONFIG_TRIGGER_EQP,           SQLITE_TriggerEQP     },
        { SQLITE_DBCONFIG_RESET_DATABASE,        SQLITE_ResetDatabase  },
      };
      unsigned int i;
      rc = SQLITE_ERROR; /* IMP: R-42790-23372 */
      for(i=0; i<ArraySize(aFlagOp); i++){
        if( aFlagOp[i].op==op ){
          int onoff = va_arg(ap, int);
          int *pRes = va_arg(ap, int*);
................................................................................

/* fts3_expr.c */
SQLITE_PRIVATE int sqlite3Fts3ExprParse(sqlite3_tokenizer *, int,
  char **, int, int, int, const char *, int, Fts3Expr **, char **
);
SQLITE_PRIVATE void sqlite3Fts3ExprFree(Fts3Expr *);
#ifdef SQLITE_TEST
SQLITE_PRIVATE int sqlite3Fts3ExprInitTestInterface(sqlite3 *db, Fts3Hash*);
SQLITE_PRIVATE int sqlite3Fts3InitTerm(sqlite3 *db);
#endif

SQLITE_PRIVATE int sqlite3Fts3OpenTokenizer(sqlite3_tokenizer *, int, const char *, int,
  sqlite3_tokenizer_cursor **
);

................................................................................
    ){
      rc = SQLITE_NOMEM;
    }
  }

#ifdef SQLITE_TEST
  if( rc==SQLITE_OK ){
    rc = sqlite3Fts3ExprInitTestInterface(db, pHash);
  }
#endif

  /* Create the virtual table wrapper around the hash-table and overload 
  ** the four scalar functions. If this is successful, register the
  ** module with sqlite.
  */
................................................................................
** Everything after this point is just test code.
*/

#ifdef SQLITE_TEST

/* #include <stdio.h> */





























/*
** Return a pointer to a buffer containing a text representation of the
** expression passed as the first argument. The buffer is obtained from
** sqlite3_malloc(). It is the responsibility of the caller to use 
** sqlite3_free() to release the memory. If an OOM condition is encountered,
** NULL is returned.
**
................................................................................
** to parse the query expression (see README.tokenizers). The second argument
** is the query expression to parse. Each subsequent argument is the name
** of a column of the fts3 table that the query expression may refer to.
** For example:
**
**   SELECT fts3_exprtest('simple', 'Bill col2:Bloggs', 'col1', 'col2');
*/
static void fts3ExprTestCommon(
  int bRebalance,
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){

  sqlite3_tokenizer *pTokenizer = 0;
  int rc;
  char **azCol = 0;
  const char *zExpr;
  int nExpr;
  int nCol;
  int ii;
  Fts3Expr *pExpr;
  char *zBuf = 0;
  Fts3Hash *pHash = (Fts3Hash*)sqlite3_user_data(context);
  const char *zTokenizer = 0;
  char *zErr = 0;

  if( argc<3 ){
    sqlite3_result_error(context, 
        "Usage: fts3_exprtest(tokenizer, expr, col1, ...", -1
    );
    return;
  }


  zTokenizer = (const char*)sqlite3_value_text(argv[0]);
  rc = sqlite3Fts3InitTokenizer(pHash, zTokenizer, &pTokenizer, &zErr);
  if( rc!=SQLITE_OK ){
    if( rc==SQLITE_NOMEM ){
      sqlite3_result_error_nomem(context);

    }else{
      sqlite3_result_error(context, zErr, -1);

    }
    sqlite3_free(zErr);
    return;
  }








  zExpr = (const char *)sqlite3_value_text(argv[1]);
  nExpr = sqlite3_value_bytes(argv[1]);
  nCol = argc-2;
  azCol = (char **)sqlite3_malloc(nCol*sizeof(char *));
  if( !azCol ){
    sqlite3_result_error_nomem(context);
    goto exprtest_out;
  }
  for(ii=0; ii<nCol; ii++){
    azCol[ii] = (char *)sqlite3_value_text(argv[ii+2]);
  }

  if( bRebalance ){
    char *zDummy = 0;
    rc = sqlite3Fts3ExprParse(
        pTokenizer, 0, azCol, 0, nCol, nCol, zExpr, nExpr, &pExpr, &zDummy
    );
    assert( rc==SQLITE_OK || pExpr==0 );
    sqlite3_free(zDummy);
  }else{
................................................................................
    sqlite3_result_text(context, zBuf, -1, SQLITE_TRANSIENT);
    sqlite3_free(zBuf);
  }

  sqlite3Fts3ExprFree(pExpr);

exprtest_out:
  if( pTokenizer ){
    rc = pTokenizer->pModule->xDestroy(pTokenizer);
  }
  sqlite3_free(azCol);
}

static void fts3ExprTest(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  fts3ExprTestCommon(0, context, argc, argv);
}
static void fts3ExprTestRebalance(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  fts3ExprTestCommon(1, context, argc, argv);
}

/*
** Register the query expression parser test function fts3_exprtest() 
** with database connection db. 
*/
SQLITE_PRIVATE int sqlite3Fts3ExprInitTestInterface(sqlite3 *db, Fts3Hash *pHash){
  int rc = sqlite3_create_function(
      db, "fts3_exprtest", -1, SQLITE_UTF8, (void*)pHash, fts3ExprTest, 0, 0
  );
  if( rc==SQLITE_OK ){
    rc = sqlite3_create_function(db, "fts3_exprtest_rebalance", 
        -1, SQLITE_UTF8, (void*)pHash, fts3ExprTestRebalance, 0, 0
    );
  }
  return rc;
}

#endif
#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS3) */
................................................................................
**
** RBU_STATE_COOKIE:
**   Valid if STAGE==1. The current change-counter cookie value in the 
**   target db file.
**
** RBU_STATE_OALSZ:
**   Valid if STAGE==1. The size in bytes of the *-oal file.
**
** RBU_STATE_DATATBL:
**   Only valid if STAGE==1. The RBU database name of the table 
**   currently being read.
*/
#define RBU_STATE_STAGE        1
#define RBU_STATE_TBL          2
#define RBU_STATE_IDX          3
#define RBU_STATE_ROW          4
#define RBU_STATE_PROGRESS     5
#define RBU_STATE_CKPT         6
#define RBU_STATE_COOKIE       7
#define RBU_STATE_OALSZ        8
#define RBU_STATE_PHASEONESTEP 9
#define RBU_STATE_DATATBL     10

#define RBU_STAGE_OAL         1
#define RBU_STAGE_MOVE        2
#define RBU_STAGE_CAPTURE     3
#define RBU_STAGE_CKPT        4
#define RBU_STAGE_DONE        5

................................................................................

/*
** A structure to store values read from the rbu_state table in memory.
*/
struct RbuState {
  int eStage;
  char *zTbl;
  char *zDataTbl;
  char *zIdx;
  i64 iWalCksum;
  int nRow;
  i64 nProgress;
  u32 iCookie;
  i64 iOalSz;
  i64 nPhaseOneStep;
................................................................................

/*
** Free an RbuState object allocated by rbuLoadState().
*/
static void rbuFreeState(RbuState *p){
  if( p ){
    sqlite3_free(p->zTbl);
    sqlite3_free(p->zDataTbl);
    sqlite3_free(p->zIdx);
    sqlite3_free(p);
  }
}

/*
** Allocate an RbuState object and load the contents of the rbu_state 
................................................................................
      case RBU_STATE_OALSZ:
        pRet->iOalSz = (u32)sqlite3_column_int64(pStmt, 1);
        break;

      case RBU_STATE_PHASEONESTEP:
        pRet->nPhaseOneStep = sqlite3_column_int64(pStmt, 1);
        break;

      case RBU_STATE_DATATBL:
        pRet->zDataTbl = rbuStrndup((char*)sqlite3_column_text(pStmt, 1), &rc);
        break;

      default:
        rc = SQLITE_CORRUPT;
        break;
    }
  }
  rc2 = sqlite3_finalize(pStmt);
................................................................................
          "(%d, %Q), "
          "(%d, %Q), "
          "(%d, %d), "
          "(%d, %d), "
          "(%d, %lld), "
          "(%d, %lld), "
          "(%d, %lld), "
          "(%d, %lld), "
          "(%d, %Q)  ",
          p->zStateDb,
          RBU_STATE_STAGE, eStage,
          RBU_STATE_TBL, p->objiter.zTbl, 
          RBU_STATE_IDX, p->objiter.zIdx, 
          RBU_STATE_ROW, p->nStep, 
          RBU_STATE_PROGRESS, p->nProgress,
          RBU_STATE_CKPT, p->iWalCksum,
          RBU_STATE_COOKIE, (i64)pFd->iCookie,
          RBU_STATE_OALSZ, p->iOalSz,
          RBU_STATE_PHASEONESTEP, p->nPhaseOneStep,
          RBU_STATE_DATATBL, p->objiter.zDataTbl
      )
    );
    assert( pInsert==0 || rc==SQLITE_OK );

    if( rc==SQLITE_OK ){
      sqlite3_step(pInsert);
      rc = sqlite3_finalize(pInsert);
................................................................................
  assert( p->rc==SQLITE_OK );
  if( pState->zTbl ){
    RbuObjIter *pIter = &p->objiter;
    int rc = SQLITE_OK;

    while( rc==SQLITE_OK && pIter->zTbl && (pIter->bCleanup 
       || rbuStrCompare(pIter->zIdx, pState->zIdx)
       || (pState->zDataTbl==0 && rbuStrCompare(pIter->zTbl, pState->zTbl))
       || (pState->zDataTbl && rbuStrCompare(pIter->zDataTbl, pState->zDataTbl))
    )){
      rc = rbuObjIterNext(p, pIter);
    }

    if( rc==SQLITE_OK && !pIter->zTbl ){
      rc = SQLITE_ERROR;
      p->zErrmsg = sqlite3_mprintf("rbu_state mismatch error");
................................................................................
static void fts5SourceIdFunc(
  sqlite3_context *pCtx,          /* Function call context */
  int nArg,                       /* Number of args */
  sqlite3_value **apUnused        /* Function arguments */
){
  assert( nArg==0 );
  UNUSED_PARAM2(nArg, apUnused);
  sqlite3_result_text(pCtx, "fts5: 2018-05-05 01:23:28 9191ff670cb7f36e0b2dac4a22888679b639845687aef8edcc3c05e35ba71eda", -1, SQLITE_TRANSIENT);
}

static int fts5Init(sqlite3 *db){
  static const sqlite3_module fts5Mod = {
    /* iVersion      */ 2,
    /* xCreate       */ fts5CreateMethod,
    /* xConnect      */ fts5ConnectMethod,
................................................................................
#endif
  return rc;
}
#endif /* SQLITE_CORE */
#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_STMTVTAB) */

/************** End of stmt.c ************************************************/
#if __LINE__!=211176
#undef SQLITE_SOURCE_ID
#define SQLITE_SOURCE_ID      "2018-05-05 01:23:28 9191ff670cb7f36e0b2dac4a22888679b639845687aef8edcc3c05e35ba7alt2"
#endif
/* Return the source-id for this library */
SQLITE_API const char *sqlite3_sourceid(void){ return SQLITE_SOURCE_ID; }
/************************** End of sqlite3.c ******************************/

**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.24.0"
#define SQLITE_VERSION_NUMBER 3024000
#define SQLITE_SOURCE_ID      "2018-04-26 18:34:26 9fd0faf517993587d2f54212638545fc85fbbc84a031bcfae8c1e5894825d83b"

/*
** CAPI3REF: Run-Time Library Version Numbers
** KEYWORDS: sqlite3_version sqlite3_sourceid
**
** These interfaces provide the same information as the [SQLITE_VERSION],
** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros
................................................................................
** behavior. The first parameter passed to this operation is an integer -
** positive to enable output for trigger programs, or zero to disable it,
** or negative to leave the setting unchanged.
** The second parameter is a pointer to an integer into which is written 
** 0 or 1 to indicate whether output-for-triggers has been disabled - 0 if 
** it is not disabled, 1 if it is.  
** </dd>















** </dl>
*/
#define SQLITE_DBCONFIG_MAINDBNAME            1000 /* const char* */
#define SQLITE_DBCONFIG_LOOKASIDE             1001 /* void* int int */
#define SQLITE_DBCONFIG_ENABLE_FKEY           1002 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_TRIGGER        1003 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER 1004 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION 1005 /* int int* */
#define SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE      1006 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_QPSG           1007 /* int int* */
#define SQLITE_DBCONFIG_TRIGGER_EQP           1008 /* int int* */

#define SQLITE_DBCONFIG_MAX                   1008 /* Largest DBCONFIG */

/*
** CAPI3REF: Enable Or Disable Extended Result Codes
** METHOD: sqlite3
**
** ^The sqlite3_extended_result_codes() routine enables or disables the
** [extended result codes] feature of SQLite. ^The extended result
................................................................................
** using [sqlite3_free].
** Hence, if this variable is modified directly, either it should be
** made NULL or made to point to memory obtained from [sqlite3_malloc]
** or else the use of the [data_store_directory pragma] should be avoided.
*/
SQLITE_API SQLITE_EXTERN char *sqlite3_data_directory;




































/*
** CAPI3REF: Test For Auto-Commit Mode
** KEYWORDS: {autocommit mode}
** METHOD: sqlite3
**
** ^The sqlite3_get_autocommit() interface returns non-zero or
** zero if the given database connection is or is not in autocommit mode,

**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.24.0"
#define SQLITE_VERSION_NUMBER 3024000
#define SQLITE_SOURCE_ID      "2018-05-05 01:23:28 9191ff670cb7f36e0b2dac4a22888679b639845687aef8edcc3c05e35ba71eda"

/*
** CAPI3REF: Run-Time Library Version Numbers
** KEYWORDS: sqlite3_version sqlite3_sourceid
**
** These interfaces provide the same information as the [SQLITE_VERSION],
** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros
................................................................................
** behavior. The first parameter passed to this operation is an integer -
** positive to enable output for trigger programs, or zero to disable it,
** or negative to leave the setting unchanged.
** The second parameter is a pointer to an integer into which is written 
** 0 or 1 to indicate whether output-for-triggers has been disabled - 0 if 
** it is not disabled, 1 if it is.  
** </dd>
**
** <dt>SQLITE_DBCONFIG_RESET_DATABASE</dt>
** <dd> Set the SQLITE_DBCONFIG_RESET_DATABASE flag and then run
** [VACUUM] in order to reset a database back to an empty database
** with no schema and no content. The following process works even for
** a badly corrupted database file:
** <ol>
** <li> sqlite3_db_config(db, SQLITE_DBCONFIG_RESET_DATABASE, 1, 0);
** <li> [sqlite3_exec](db, "[VACUUM]", 0, 0, 0);
** <li> sqlite3_db_config(db, SQLITE_DBCONFIG_RESET_DATABASE, 0, 0);
** </ol>
** Because resetting a database is destructive and irreversible, the
** process requires the use of this obscure API and multiple steps to help
** ensure that it does not happen by accident.
** </dd>
** </dl>
*/
#define SQLITE_DBCONFIG_MAINDBNAME            1000 /* const char* */
#define SQLITE_DBCONFIG_LOOKASIDE             1001 /* void* int int */
#define SQLITE_DBCONFIG_ENABLE_FKEY           1002 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_TRIGGER        1003 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER 1004 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION 1005 /* int int* */
#define SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE      1006 /* int int* */
#define SQLITE_DBCONFIG_ENABLE_QPSG           1007 /* int int* */
#define SQLITE_DBCONFIG_TRIGGER_EQP           1008 /* int int* */
#define SQLITE_DBCONFIG_RESET_DATABASE        1009 /* int int* */
#define SQLITE_DBCONFIG_MAX                   1009 /* Largest DBCONFIG */

/*
** CAPI3REF: Enable Or Disable Extended Result Codes
** METHOD: sqlite3
**
** ^The sqlite3_extended_result_codes() routine enables or disables the
** [extended result codes] feature of SQLite. ^The extended result
................................................................................
** using [sqlite3_free].
** Hence, if this variable is modified directly, either it should be
** made NULL or made to point to memory obtained from [sqlite3_malloc]
** or else the use of the [data_store_directory pragma] should be avoided.
*/
SQLITE_API SQLITE_EXTERN char *sqlite3_data_directory;

/*
** CAPI3REF: Win32 Specific Interface
**
** These interfaces are available only on Windows.  The
** [sqlite3_win32_set_directory] interface is used to set the value associated
** with the [sqlite3_temp_directory] or [sqlite3_data_directory] variable, to
** zValue, depending on the value of the type parameter.  The zValue parameter
** should be NULL to cause the previous value to be freed via [sqlite3_free];
** a non-NULL value will be copied into memory obtained from [sqlite3_malloc]
** prior to being used.  The [sqlite3_win32_set_directory] interface returns
** [SQLITE_OK] to indicate success, [SQLITE_ERROR] if the type is unsupported,
** or [SQLITE_NOMEM] if memory could not be allocated.  The value of the
** [sqlite3_data_directory] variable is intended to act as a replacement for
** the current directory on the sub-platforms of Win32 where that concept is
** not present, e.g. WinRT and UWP.  The [sqlite3_win32_set_directory8] and
** [sqlite3_win32_set_directory16] interfaces behave exactly the same as the
** sqlite3_win32_set_directory interface except the string parameter must be
** UTF-8 or UTF-16, respectively.
*/
SQLITE_API int sqlite3_win32_set_directory(
  unsigned long type, /* Identifier for directory being set or reset */
  void *zValue        /* New value for directory being set or reset */
);
SQLITE_API int sqlite3_win32_set_directory8(unsigned long type, const char *zValue);
SQLITE_API int sqlite3_win32_set_directory16(unsigned long type, const void *zValue);

/*
** CAPI3REF: Win32 Directory Types
**
** These macros are only available on Windows.  They define the allowed values
** for the type argument to the [sqlite3_win32_set_directory] interface.
*/
#define SQLITE_WIN32_DATA_DIRECTORY_TYPE  1
#define SQLITE_WIN32_TEMP_DIRECTORY_TYPE  2

/*
** CAPI3REF: Test For Auto-Commit Mode
** KEYWORDS: {autocommit mode}
** METHOD: sqlite3
**
** ^The sqlite3_get_autocommit() interface returns non-zero or
** zero if the given database connection is or is not in autocommit mode,