Fossil

    if( f==0 ){
      utf8_printf(stderr, "Error: cannot open \"%s\"\n", zFile);
    }
  }
  return f;
}

#if !defined(SQLITE_UNTESTABLE)
#if !defined(SQLITE_OMIT_TRACE) && !defined(SQLITE_OMIT_FLOATING_POINT)
/*
** A routine for handling output from sqlite3_trace().
*/
static int sql_trace_callback(
  unsigned mType,
  void *pArg,

    }else if( rc != SQLITE_OK ){
      raw_printf(stderr,
                 "Error: querying sqlite_master and sqlite_temp_master\n");
      rc = 1;
    }
  }else

#ifndef SQLITE_UNTESTABLE
  if( c=='i' && strncmp(azArg[0], "imposter", n)==0 ){
    char *zSql;
    char *zCollist = 0;
    sqlite3_stmt *pStmt;
    int tnum = 0;
    int i;
    if( nArg!=3 ){

      p->mode = MODE_Quote;
    }else if( c2=='a' && strncmp(azArg[1],"ascii",n2)==0 ){
      p->mode = MODE_Ascii;
      sqlite3_snprintf(sizeof(p->colSeparator), p->colSeparator, SEP_Unit);
      sqlite3_snprintf(sizeof(p->rowSeparator), p->rowSeparator, SEP_Record);
    }else {
      raw_printf(stderr, "Error: mode should be one of: "
         "ascii column csv html insert line list quote tabs tcl\n");
      rc = 1;
    }
    p->cMode = p->mode;
  }else

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

    if( nArg>=2 ){
      sqlite3_snprintf(sizeof(p->zTestcase), p->zTestcase, "%s", azArg[1]);
    }else{
      sqlite3_snprintf(sizeof(p->zTestcase), p->zTestcase, "?");
    }
  }else

#ifndef SQLITE_UNTESTABLE
  if( c=='t' && n>=8 && strncmp(azArg[0], "testctrl", n)==0 && nArg>=2 ){
    static const struct {
       const char *zCtrlName;   /* Name of a test-control option */
       int ctrlCode;            /* Integer code for that option */
    } aCtrl[] = {
      { "prng_save",             SQLITE_TESTCTRL_PRNG_SAVE              },
      { "prng_restore",          SQLITE_TESTCTRL_PRNG_RESTORE           },

    if( p->traceOut==0 ){
      sqlite3_trace_v2(p->db, 0, 0, 0);
    }else{
      sqlite3_trace_v2(p->db, SQLITE_TRACE_STMT, sql_trace_callback,p->traceOut);
    }
#endif
  }else
#endif /* !defined(SQLITE_UNTESTABLE) */

#if SQLITE_USER_AUTHENTICATION
  if( c=='u' && strncmp(azArg[0], "user", n)==0 ){
    if( nArg<2 ){
      raw_printf(stderr, "Usage: .user SUBCOMMAND ...\n");
      rc = 1;
      goto meta_command_exit;

**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.16.0"
#define SQLITE_VERSION_NUMBER 3016000
#define SQLITE_SOURCE_ID      "2016-12-08 19:04:36 b26df26e184ec6da4b5537526c10f42a293d09b5"

/*
** 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

** [SAVEPOINT], and [RELEASE] cause sqlite3_stmt_readonly() to return true,
** since the statements themselves do not actually modify the database but
** rather they control the timing of when other statements modify the 
** database.  ^The [ATTACH] and [DETACH] statements also cause
** sqlite3_stmt_readonly() to return true since, while those statements
** change the configuration of a database connection, they do not make 
** changes to the content of the database files on disk.
** ^The sqlite3_stmt_readonly() interface returns true for [BEGIN] since
** [BEGIN] merely sets internal flags, but the [BEGIN|BEGIN IMMEDIATE] and
** [BEGIN|BEGIN EXCLUSIVE] commands do touch the database and so
** sqlite3_stmt_readonly() returns false for those commands.
*/
SQLITE_API int sqlite3_stmt_readonly(sqlite3_stmt *pStmt);

/*
** CAPI3REF: Determine If A Prepared Statement Has Been Reset
** METHOD: sqlite3_stmt
**

** called to get back the underlying "errno" that caused the problem, such
** as ENOSPC, EAUTH, EISDIR, and so forth.  
*/
SQLITE_API int sqlite3_system_errno(sqlite3*);

/*
** CAPI3REF: Database Snapshot
** KEYWORDS: {snapshot} {sqlite3_snapshot}
** EXPERIMENTAL
**
** An instance of the snapshot object records the state of a [WAL mode]
** database for some specific point in history.
**
** In [WAL mode], multiple [database connections] that are open on the
** same database file can each be reading a different historical version

** the most recent version.
**
** The constructor for this object is [sqlite3_snapshot_get()].  The
** [sqlite3_snapshot_open()] method causes a fresh read transaction to refer
** to an historical snapshot (if possible).  The destructor for 
** sqlite3_snapshot objects is [sqlite3_snapshot_free()].
*/
typedef struct sqlite3_snapshot {
  unsigned char hidden[48];
} sqlite3_snapshot;

/*
** CAPI3REF: Record A Database Snapshot
** EXPERIMENTAL
**
** ^The [sqlite3_snapshot_get(D,S,P)] interface attempts to make a
** new [sqlite3_snapshot] object that records the current state of
** schema S in database connection D.  ^On success, the
** [sqlite3_snapshot_get(D,S,P)] interface writes a pointer to the newly
** created [sqlite3_snapshot] object into *P and returns SQLITE_OK.
** If there is not already a read-transaction open on schema S when
** this function is called, one is opened automatically. 
**
** The following must be true for this function to succeed. If any of
** the following statements are false when sqlite3_snapshot_get() is
** called, SQLITE_ERROR is returned. The final value of *P is undefined
** in this case. 
**
** <ul>
**   <li> The database handle must be in [autocommit mode].
**
**   <li> Schema S of [database connection] D must be a [WAL mode] database.
**
**   <li> There must not be a write transaction open on schema S of database
**        connection D.
**
**   <li> One or more transactions must have been written to the current wal
**        file since it was created on disk (by any connection). This means
**        that a snapshot cannot be taken on a wal mode database with no wal 
**        file immediately after it is first opened. At least one transaction
**        must be written to it first.
** </ul>
**
** This function may also return SQLITE_NOMEM.  If it is called with the
** database handle in autocommit mode but fails for some other reason, 
** whether or not a read transaction is opened on schema S is undefined.

**
** The [sqlite3_snapshot] object returned from a successful call to
** [sqlite3_snapshot_get()] must be freed using [sqlite3_snapshot_free()]
** to avoid a memory leak.
**
** The [sqlite3_snapshot_get()] interface is only available when the
** SQLITE_ENABLE_SNAPSHOT compile-time option is used.

** snapshot, and a positive value if P1 is a newer snapshot than P2.
*/
SQLITE_API SQLITE_EXPERIMENTAL int sqlite3_snapshot_cmp(
  sqlite3_snapshot *p1,
  sqlite3_snapshot *p2
);

/*
** CAPI3REF: Recover snapshots from a wal file
** EXPERIMENTAL
**
** If all connections disconnect from a database file but do not perform
** a checkpoint, the existing wal file is opened along with the database
** file the next time the database is opened. At this point it is only
** possible to successfully call sqlite3_snapshot_open() to open the most
** recent snapshot of the database (the one at the head of the wal file),
** even though the wal file may contain other valid snapshots for which
** clients have sqlite3_snapshot handles.
**
** This function attempts to scan the wal file associated with database zDb
** of database handle db and make all valid snapshots available to
** sqlite3_snapshot_open(). It is an error if there is already a read
** transaction open on the database, or if the database is not a wal mode
** database.
**
** SQLITE_OK is returned if successful, or an SQLite error code otherwise.
*/
SQLITE_API SQLITE_EXPERIMENTAL int sqlite3_snapshot_recover(sqlite3 *db, const char *zDb);

/*
** Undo the hack that converts floating point types to integer for
** builds on processors without floating point support.
*/
#ifdef SQLITE_OMIT_FLOATING_POINT
# undef double
#endif

                       int bias, int seekResult);
SQLITE_PRIVATE int sqlite3BtreeFirst(BtCursor*, int *pRes);
SQLITE_PRIVATE int sqlite3BtreeLast(BtCursor*, int *pRes);
SQLITE_PRIVATE int sqlite3BtreeNext(BtCursor*, int *pRes);
SQLITE_PRIVATE int sqlite3BtreeEof(BtCursor*);
SQLITE_PRIVATE int sqlite3BtreePrevious(BtCursor*, int *pRes);
SQLITE_PRIVATE i64 sqlite3BtreeIntegerKey(BtCursor*);
SQLITE_PRIVATE int sqlite3BtreePayload(BtCursor*, u32 offset, u32 amt, void*);
SQLITE_PRIVATE const void *sqlite3BtreePayloadFetch(BtCursor*, u32 *pAmt);
SQLITE_PRIVATE u32 sqlite3BtreePayloadSize(BtCursor*);


SQLITE_PRIVATE char *sqlite3BtreeIntegrityCheck(Btree*, int *aRoot, int nRoot, int, int*);
SQLITE_PRIVATE struct Pager *sqlite3BtreePager(Btree*);

#ifndef SQLITE_OMIT_INCRBLOB
SQLITE_PRIVATE int sqlite3BtreePayloadChecked(BtCursor*, u32 offset, u32 amt, void*);
SQLITE_PRIVATE int sqlite3BtreePutData(BtCursor*, u32 offset, u32 amt, void*);
SQLITE_PRIVATE void sqlite3BtreeIncrblobCursor(BtCursor *);
#endif
SQLITE_PRIVATE void sqlite3BtreeClearCursor(BtCursor *);
SQLITE_PRIVATE int sqlite3BtreeSetVersion(Btree *pBt, int iVersion);
SQLITE_PRIVATE int sqlite3BtreeCursorHasHint(BtCursor*, unsigned int mask);
SQLITE_PRIVATE int sqlite3BtreeIsReadonly(Btree *pBt);

/*
** Allowed values of VdbeOp.p4type
*/
#define P4_NOTUSED    0   /* The P4 parameter is not used */
#define P4_DYNAMIC  (-1)  /* Pointer to a string obtained from sqliteMalloc() */
#define P4_STATIC   (-2)  /* Pointer to a static string */
#define P4_COLLSEQ  (-3)  /* P4 is a pointer to a CollSeq structure */
#define P4_FUNCDEF  (-4)  /* P4 is a pointer to a FuncDef structure */
#define P4_KEYINFO  (-5)  /* P4 is a pointer to a KeyInfo structure */
#define P4_EXPR     (-6)  /* P4 is a pointer to an Expr tree */
#define P4_MEM      (-7)  /* P4 is a pointer to a Mem*    structure */
#define P4_TRANSIENT  0   /* P4 is a pointer to a transient string */
#define P4_VTAB     (-8) /* P4 is a pointer to an sqlite3_vtab structure */

#define P4_REAL     (-9) /* P4 is a 64-bit floating point value */
#define P4_INT64    (-10) /* P4 is a 64-bit signed integer */
#define P4_INT32    (-11) /* P4 is a 32-bit signed integer */
#define P4_INTARRAY (-12) /* P4 is a vector of 32-bit integers */
#define P4_SUBPROGRAM  (-13) /* P4 is a pointer to a SubProgram structure */
#define P4_ADVANCE  (-14) /* P4 is a pointer to BtreeNext() or BtreePrev() */
#define P4_TABLE    (-15) /* P4 is a pointer to a Table structure */
#define P4_FUNCCTX  (-16) /* P4 is a pointer to an sqlite3_context object */

/* Error message codes for OP_Halt */
#define P5_ConstraintNotNull 1
#define P5_ConstraintUnique  2
#define P5_ConstraintCheck   3
#define P5_ConstraintFK      4

#define OP_NewRowid      114 /* synopsis: r[P2]=rowid                      */
#define OP_Insert        115 /* synopsis: intkey=r[P3] data=r[P2]          */
#define OP_InsertInt     116 /* synopsis: intkey=P3 data=r[P2]             */
#define OP_Delete        117
#define OP_ResetCount    118
#define OP_SorterCompare 119 /* synopsis: if key(P1)!=trim(r[P3],P4) goto P2 */
#define OP_SorterData    120 /* synopsis: r[P2]=data                       */

#define OP_RowData       121 /* synopsis: r[P2]=data                       */
#define OP_Rowid         122 /* synopsis: r[P2]=rowid                      */
#define OP_NullRow       123
#define OP_SorterInsert  124 /* synopsis: key=r[P2]                        */
#define OP_IdxInsert     125 /* synopsis: key=r[P2]                        */
#define OP_IdxDelete     126 /* synopsis: key=r[P2@P3]                     */
#define OP_Seek          127 /* synopsis: Move P3 to P1.rowid              */
#define OP_IdxRowid      128 /* synopsis: r[P2]=rowid                      */
#define OP_Destroy       129
#define OP_Clear         130
#define OP_ResetSorter   131
#define OP_Real          132 /* same as TK_FLOAT, synopsis: r[P2]=P4       */

#define OP_CreateIndex   133 /* synopsis: r[P2]=root iDb=P1                */
#define OP_CreateTable   134 /* synopsis: r[P2]=root iDb=P1                */
#define OP_ParseSchema   135
#define OP_LoadAnalysis  136
#define OP_DropTable     137
#define OP_DropIndex     138
#define OP_DropTrigger   139
#define OP_IntegrityCk   140
#define OP_RowSetAdd     141 /* synopsis: rowset(P1)=r[P2]                 */
#define OP_Param         142
#define OP_FkCounter     143 /* synopsis: fkctr[P1]+=P2                    */
#define OP_MemMax        144 /* synopsis: r[P1]=max(r[P1],r[P2])           */
#define OP_OffsetLimit   145 /* synopsis: if r[P1]>0 then r[P2]=r[P1]+max(0,r[P3]) else r[P2]=(-1) */
#define OP_AggStep0      146 /* synopsis: accum=r[P3] step(r[P2@P5])       */
#define OP_AggStep       147 /* synopsis: accum=r[P3] step(r[P2@P5])       */
#define OP_AggFinal      148 /* synopsis: accum=r[P1] N=P2                 */
#define OP_Expire        149
#define OP_TableLock     150 /* synopsis: iDb=P1 root=P2 write=P3          */
#define OP_VBegin        151
#define OP_VCreate       152
#define OP_VDestroy      153
#define OP_VOpen         154
#define OP_VColumn       155 /* synopsis: r[P3]=vcolumn(P2)                */
#define OP_VRename       156
#define OP_Pagecount     157
#define OP_MaxPgcnt      158
#define OP_CursorHint    159
#define OP_Noop          160
#define OP_Explain       161

/* Properties such as "out2" or "jump" that are specified in
** comments following the "case" for each opcode in the vdbe.c
** are encoded into bitvectors as follows:
*/
#define OPFLG_JUMP        0x01  /* jump:  P2 holds jmp target */
#define OPFLG_IN1         0x02  /* in1:   P1 is an input */

/*  64 */ 0x01, 0x01, 0x03, 0x03, 0x03, 0x01, 0x01, 0x01,\
/*  72 */ 0x02, 0x02, 0x08, 0x00, 0x10, 0x10, 0x10, 0x10,\
/*  80 */ 0x00, 0x10, 0x10, 0x00, 0x00, 0x10, 0x10, 0x00,\
/*  88 */ 0x00, 0x00, 0x00, 0x02, 0x02, 0x02, 0x00, 0x00,\
/*  96 */ 0x00, 0x10, 0x00, 0x00, 0x10, 0x10, 0x00, 0x00,\
/* 104 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
/* 112 */ 0x00, 0x10, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00,\
/* 120 */ 0x00, 0x00, 0x10, 0x00, 0x04, 0x04, 0x00, 0x00,\
/* 128 */ 0x10, 0x10, 0x00, 0x00, 0x10, 0x10, 0x10, 0x00,\
/* 136 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, 0x10, 0x00,\
/* 144 */ 0x04, 0x1a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
/* 152 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x10, 0x00,\
/* 160 */ 0x00, 0x00,}

/* The sqlite3P2Values() routine is able to run faster if it knows
** the value of the largest JUMP opcode.  The smaller the maximum
** JUMP opcode the better, so the mkopcodeh.tcl script that
** generated this include file strives to group all JUMP opcodes
** together near the beginning of the list.
*/

SQLITE_PRIVATE void sqlite3VdbeChangeP2(Vdbe*, u32 addr, int P2);
SQLITE_PRIVATE void sqlite3VdbeChangeP3(Vdbe*, u32 addr, int P3);
SQLITE_PRIVATE void sqlite3VdbeChangeP5(Vdbe*, u8 P5);
SQLITE_PRIVATE void sqlite3VdbeJumpHere(Vdbe*, int addr);
SQLITE_PRIVATE int sqlite3VdbeChangeToNoop(Vdbe*, int addr);
SQLITE_PRIVATE int sqlite3VdbeDeletePriorOpcode(Vdbe*, u8 op);
SQLITE_PRIVATE void sqlite3VdbeChangeP4(Vdbe*, int addr, const char *zP4, int N);
SQLITE_PRIVATE void sqlite3VdbeAppendP4(Vdbe*, void *pP4, int p4type);
SQLITE_PRIVATE void sqlite3VdbeSetP4KeyInfo(Parse*, Index*);
SQLITE_PRIVATE void sqlite3VdbeUsesBtree(Vdbe*, int);
SQLITE_PRIVATE VdbeOp *sqlite3VdbeGetOp(Vdbe*, int);
SQLITE_PRIVATE int sqlite3VdbeMakeLabel(Vdbe*);
SQLITE_PRIVATE void sqlite3VdbeRunOnlyOnce(Vdbe*);
SQLITE_PRIVATE void sqlite3VdbeReusable(Vdbe*);
SQLITE_PRIVATE void sqlite3VdbeDelete(Vdbe*);

SQLITE_PRIVATE   int sqlite3PagerWalCallback(Pager *pPager);
SQLITE_PRIVATE   int sqlite3PagerOpenWal(Pager *pPager, int *pisOpen);
SQLITE_PRIVATE   int sqlite3PagerCloseWal(Pager *pPager, sqlite3*);
SQLITE_PRIVATE   int sqlite3PagerUseWal(Pager *pPager);
# ifdef SQLITE_ENABLE_SNAPSHOT
SQLITE_PRIVATE   int sqlite3PagerSnapshotGet(Pager *pPager, sqlite3_snapshot **ppSnapshot);
SQLITE_PRIVATE   int sqlite3PagerSnapshotOpen(Pager *pPager, sqlite3_snapshot *pSnapshot);
SQLITE_PRIVATE   int sqlite3PagerSnapshotRecover(Pager *pPager);
# endif
#else
# define sqlite3PagerUseWal(x) 0
#endif

#ifdef SQLITE_ENABLE_ZIPVFS
SQLITE_PRIVATE   int sqlite3PagerWalFramesize(Pager *pPager);

#define SQLITE_Stat34         0x0800   /* Use STAT3 or STAT4 data */
#define SQLITE_CursorHints    0x2000   /* Add OP_CursorHint opcodes */
#define SQLITE_AllOpts        0xffff   /* All optimizations */

/*
** Macros for testing whether or not optimizations are enabled or disabled.
*/

#define OptimizationDisabled(db, mask)  (((db)->dbOptFlags&(mask))!=0)
#define OptimizationEnabled(db, mask)   (((db)->dbOptFlags&(mask))==0)





/*
** Return true if it OK to factor constant expressions into the initialization
** code. The argument is a Parse object for the code generator.
*/
#define ConstFactorOk(P) ((P)->okConstFactor)

#ifdef SQLITE_VDBE_COVERAGE
  /* The following callback (if not NULL) is invoked on every VDBE branch
  ** operation.  Set the callback using SQLITE_TESTCTRL_VDBE_COVERAGE.
  */
  void (*xVdbeBranch)(void*,int iSrcLine,u8 eThis,u8 eMx);  /* Callback */
  void *pVdbeBranchArg;                                     /* 1st argument */
#endif
#ifndef SQLITE_UNTESTABLE
  int (*xTestCallback)(int);        /* Invoked by sqlite3FaultSim() */
#endif
  int bLocaltimeFault;              /* True to fail localtime() calls */
  int iOnceResetThreshold;          /* When to reset OP_Once counters */
};

/*

SQLITE_PRIVATE int sqlite3MallocSize(void*);
SQLITE_PRIVATE int sqlite3DbMallocSize(sqlite3*, void*);
SQLITE_PRIVATE void *sqlite3ScratchMalloc(int);
SQLITE_PRIVATE void sqlite3ScratchFree(void*);
SQLITE_PRIVATE void *sqlite3PageMalloc(int);
SQLITE_PRIVATE void sqlite3PageFree(void*);
SQLITE_PRIVATE void sqlite3MemSetDefault(void);
#ifndef SQLITE_UNTESTABLE
SQLITE_PRIVATE void sqlite3BenignMallocHooks(void (*)(void), void (*)(void));
#endif
SQLITE_PRIVATE int sqlite3HeapNearlyFull(void);

/*
** On systems with ample stack space and that support alloca(), make
** use of alloca() to obtain space for large automatic objects.  By default,

SQLITE_PRIVATE void sqlite3ClearTempRegCache(Parse*);
#ifdef SQLITE_DEBUG
SQLITE_PRIVATE int sqlite3NoTempsInRange(Parse*,int,int);
#endif
SQLITE_PRIVATE Expr *sqlite3ExprAlloc(sqlite3*,int,const Token*,int);
SQLITE_PRIVATE Expr *sqlite3Expr(sqlite3*,int,const char*);
SQLITE_PRIVATE void sqlite3ExprAttachSubtrees(sqlite3*,Expr*,Expr*,Expr*);
SQLITE_PRIVATE Expr *sqlite3PExpr(Parse*, int, Expr*, Expr*);
SQLITE_PRIVATE void sqlite3PExprAddSelect(Parse*, Expr*, Select*);
SQLITE_PRIVATE Expr *sqlite3ExprAnd(sqlite3*,Expr*, Expr*);
SQLITE_PRIVATE Expr *sqlite3ExprFunction(Parse*,ExprList*, Token*);
SQLITE_PRIVATE void sqlite3ExprAssignVarNumber(Parse*, Expr*, u32);
SQLITE_PRIVATE void sqlite3ExprDelete(sqlite3*, Expr*);
SQLITE_PRIVATE ExprList *sqlite3ExprListAppend(Parse*,ExprList*,Expr*);
SQLITE_PRIVATE ExprList *sqlite3ExprListAppendVector(Parse*,ExprList*,IdList*,Expr*);

SQLITE_PRIVATE void sqlite3AddDefaultValue(Parse*,ExprSpan*);
SQLITE_PRIVATE void sqlite3AddCollateType(Parse*, Token*);
SQLITE_PRIVATE void sqlite3EndTable(Parse*,Token*,Token*,u8,Select*);
SQLITE_PRIVATE int sqlite3ParseUri(const char*,const char*,unsigned int*,
                    sqlite3_vfs**,char**,char **);
SQLITE_PRIVATE Btree *sqlite3DbNameToBtree(sqlite3*,const char*);

#ifdef SQLITE_UNTESTABLE
# define sqlite3FaultSim(X) SQLITE_OK
#else
SQLITE_PRIVATE   int sqlite3FaultSim(int);
#endif

SQLITE_PRIVATE Bitvec *sqlite3BitvecCreate(u32);
SQLITE_PRIVATE int sqlite3BitvecTest(Bitvec*, u32);
SQLITE_PRIVATE int sqlite3BitvecTestNotNull(Bitvec*, u32);
SQLITE_PRIVATE int sqlite3BitvecSet(Bitvec*, u32);
SQLITE_PRIVATE void sqlite3BitvecClear(Bitvec*, u32, void*);
SQLITE_PRIVATE void sqlite3BitvecDestroy(Bitvec*);
SQLITE_PRIVATE u32 sqlite3BitvecSize(Bitvec*);
#ifndef SQLITE_UNTESTABLE
SQLITE_PRIVATE int sqlite3BitvecBuiltinTest(int,int*);
#endif

SQLITE_PRIVATE RowSet *sqlite3RowSetInit(sqlite3*, void*, unsigned int);
SQLITE_PRIVATE void sqlite3RowSetClear(RowSet*);
SQLITE_PRIVATE void sqlite3RowSetInsert(RowSet*, i64);
SQLITE_PRIVATE int sqlite3RowSetTest(RowSet*, int iBatch, i64);

SQLITE_PRIVATE int sqlite3ExprListCompare(ExprList*, ExprList*, int);
SQLITE_PRIVATE int sqlite3ExprImpliesExpr(Expr*, Expr*, int);
SQLITE_PRIVATE void sqlite3ExprAnalyzeAggregates(NameContext*, Expr*);
SQLITE_PRIVATE void sqlite3ExprAnalyzeAggList(NameContext*,ExprList*);
SQLITE_PRIVATE int sqlite3ExprCoveredByIndex(Expr*, int iCur, Index *pIdx);
SQLITE_PRIVATE int sqlite3FunctionUsesThisSrc(Expr*, SrcList*);
SQLITE_PRIVATE Vdbe *sqlite3GetVdbe(Parse*);
#ifndef SQLITE_UNTESTABLE
SQLITE_PRIVATE void sqlite3PrngSaveState(void);
SQLITE_PRIVATE void sqlite3PrngRestoreState(void);
#endif
SQLITE_PRIVATE void sqlite3RollbackAll(sqlite3*,int);
SQLITE_PRIVATE void sqlite3CodeVerifySchema(Parse*, int);
SQLITE_PRIVATE void sqlite3CodeVerifyNamedSchema(Parse*, const char *zDb);
SQLITE_PRIVATE void sqlite3BeginTransaction(Parse*, int);

** Available fault injectors.  Should be numbered beginning with 0.
*/
#define SQLITE_FAULTINJECTOR_MALLOC     0
#define SQLITE_FAULTINJECTOR_COUNT      1

/*
** The interface to the code in fault.c used for identifying "benign"
** malloc failures. This is only present if SQLITE_UNTESTABLE
** is not defined.
*/
#ifndef SQLITE_UNTESTABLE
SQLITE_PRIVATE   void sqlite3BeginBenignMalloc(void);
SQLITE_PRIVATE   void sqlite3EndBenignMalloc(void);
#else
  #define sqlite3BeginBenignMalloc()
  #define sqlite3EndBenignMalloc()
#endif

SQLITE_PRIVATE int sqlite3DbstatRegister(sqlite3*);
#endif

SQLITE_PRIVATE int sqlite3ExprVectorSize(Expr *pExpr);
SQLITE_PRIVATE int sqlite3ExprIsVector(Expr *pExpr);
SQLITE_PRIVATE Expr *sqlite3VectorFieldSubexpr(Expr*, int);
SQLITE_PRIVATE Expr *sqlite3ExprForVectorField(Parse*,Expr*,int);
SQLITE_PRIVATE void sqlite3VectorErrorMsg(Parse*, Expr*);

#endif /* SQLITEINT_H */

/************** End of sqliteInt.h *******************************************/
/************** Begin file global.c ******************************************/
/*
** 2008 June 13

   0,                         /* xSqllog */
   0,                         /* pSqllogArg */
#endif
#ifdef SQLITE_VDBE_COVERAGE
   0,                         /* xVdbeBranch */
   0,                         /* pVbeBranchArg */
#endif
#ifndef SQLITE_UNTESTABLE
   0,                         /* xTestCallback */
#endif
   0,                         /* bLocaltimeFault */
   0x7ffffffe                 /* iOnceResetThreshold */
};

/*

#endif
#if SQLITE_OMIT_BLOB_LITERAL
  "OMIT_BLOB_LITERAL",
#endif
#if SQLITE_OMIT_BTREECOUNT
  "OMIT_BTREECOUNT",
#endif



#if SQLITE_OMIT_CAST
  "OMIT_CAST",
#endif
#if SQLITE_OMIT_CHECK
  "OMIT_CHECK",
#endif
#if SQLITE_OMIT_COMPLETE

  "TEMP_STORE=" CTIMEOPT_VAL(SQLITE_TEMP_STORE),
#endif
#if SQLITE_TEST
  "TEST",
#endif
#if defined(SQLITE_THREADSAFE)
  "THREADSAFE=" CTIMEOPT_VAL(SQLITE_THREADSAFE),
#endif
#if SQLITE_UNTESTABLE
  "UNTESTABLE"
#endif
#if SQLITE_USE_ALLOCA
  "USE_ALLOCA",
#endif
#if SQLITE_USER_AUTHENTICATION
  "USER_AUTHENTICATION",
#endif

SQLITE_PRIVATE i64 sqlite3VdbeIntValue(Mem*);
SQLITE_PRIVATE int sqlite3VdbeMemIntegerify(Mem*);
SQLITE_PRIVATE double sqlite3VdbeRealValue(Mem*);
SQLITE_PRIVATE void sqlite3VdbeIntegerAffinity(Mem*);
SQLITE_PRIVATE int sqlite3VdbeMemRealify(Mem*);
SQLITE_PRIVATE int sqlite3VdbeMemNumerify(Mem*);
SQLITE_PRIVATE void sqlite3VdbeMemCast(Mem*,u8,u8);
SQLITE_PRIVATE int sqlite3VdbeMemFromBtree(BtCursor*,u32,u32,Mem*);
SQLITE_PRIVATE void sqlite3VdbeMemRelease(Mem *p);
SQLITE_PRIVATE int sqlite3VdbeMemFinalize(Mem*, FuncDef*);
SQLITE_PRIVATE const char *sqlite3OpcodeName(int);
SQLITE_PRIVATE int sqlite3VdbeMemGrow(Mem *pMem, int n, int preserve);
SQLITE_PRIVATE int sqlite3VdbeMemClearAndResize(Mem *pMem, int n);
SQLITE_PRIVATE int sqlite3VdbeCloseStatement(Vdbe *, int);
SQLITE_PRIVATE void sqlite3VdbeFrameDelete(VdbeFrame*);

#endif

/*
** A structure for holding a single date and time.
*/
typedef struct DateTime DateTime;
struct DateTime {
  sqlite3_int64 iJD;  /* The julian day number times 86400000 */
  int Y, M, D;        /* Year, month, and day */
  int h, m;           /* Hour and minutes */
  int tz;             /* Timezone offset in minutes */
  double s;           /* Seconds */
  char validJD;       /* True (1) if iJD is valid */
  char rawS;          /* Raw numeric value stored in s */
  char validYMD;      /* True (1) if Y,M,D are valid */
  char validHMS;      /* True (1) if h,m,s are valid */

  char validTZ;       /* True (1) if tz is valid */
  char tzSet;         /* Timezone was set explicitly */
  char isError;       /* An overflow has occurred */
};


/*
** Convert zDate into one or more integers according to the conversion
** specifier zFormat.
**

      }
      ms /= rScale;
    }
  }else{
    s = 0;
  }
  p->validJD = 0;
  p->rawS = 0;
  p->validHMS = 1;
  p->h = h;
  p->m = m;
  p->s = s + ms;
  if( parseTimezone(zDate, p) ) return 1;
  p->validTZ = (p->tz!=0)?1:0;
  return 0;
}

/*
** Put the DateTime object into its error state.
*/
static void datetimeError(DateTime *p){
  memset(p, 0, sizeof(*p));
  p->isError = 1;
}

/*
** Convert from YYYY-MM-DD HH:MM:SS to julian day.  We always assume
** that the YYYY-MM-DD is according to the Gregorian calendar.
**
** Reference:  Meeus page 61
*/
static void computeJD(DateTime *p){
  int Y, M, D, A, B, X1, X2;

  if( p->validJD ) return;
  if( p->validYMD ){
    Y = p->Y;
    M = p->M;
    D = p->D;
  }else{
    Y = 2000;  /* If no YMD specified, assume 2000-Jan-01 */
    M = 1;
    D = 1;
  }
  if( Y<-4713 || Y>9999 || p->rawS ){
    datetimeError(p);
    return;
  }
  if( M<=2 ){
    Y--;
    M += 12;
  }
  A = Y/100;
  B = 2 - A + (A/4);

  if( p->iJD>0 ){
    p->validJD = 1;
    return 0;
  }else{
    return 1;
  }
}

/*
** Input "r" is a numeric quantity which might be a julian day number,
** or the number of seconds since 1970.  If the value if r is within
** range of a julian day number, install it as such and set validJD.
** If the value is a valid unix timestamp, put it in p->s and set p->rawS.
*/
static void setRawDateNumber(DateTime *p, double r){
  p->s = r;
  p->rawS = 1;
  if( r>=0.0 && r<5373484.5 ){
    p->iJD = (sqlite3_int64)(r*86400000.0 + 0.5);
    p->validJD = 1;
  }
}

/*
** Attempt to parse the given string into a julian day number.  Return
** the number of errors.
**
** The following are acceptable forms for the input string:
**

  if( parseYyyyMmDd(zDate,p)==0 ){
    return 0;
  }else if( parseHhMmSs(zDate, p)==0 ){
    return 0;
  }else if( sqlite3StrICmp(zDate,"now")==0){
    return setDateTimeToCurrent(context, p);
  }else if( sqlite3AtoF(zDate, &r, sqlite3Strlen30(zDate), SQLITE_UTF8) ){
    setRawDateNumber(p, r);

    return 0;
  }
  return 1;
}

/*
** Return TRUE if the given julian day number is within range.
**
** The input is the JulianDay times 86400000.
*/
static int validJulianDay(sqlite3_int64 iJD){
  return iJD>=0 && iJD<=464269060799999;
}

/*
** Compute the Year, Month, and Day from the julian day number.
*/
static void computeYMD(DateTime *p){
  int Z, A, B, C, D, E, X1;
  if( p->validYMD ) return;
  if( !p->validJD ){
    p->Y = 2000;
    p->M = 1;
    p->D = 1;
  }else{
    assert( validJulianDay(p->iJD) );
    Z = (int)((p->iJD + 43200000)/86400000);
    A = (int)((Z - 1867216.25)/36524.25);
    A = Z + 1 + A - (A/4);
    B = A + 1524;
    C = (int)((B - 122.1)/365.25);
    D = (36525*(C&32767))/100;
    E = (int)((B-D)/30.6001);

  p->s = s/1000.0;
  s = (int)p->s;
  p->s -= s;
  p->h = s/3600;
  s -= p->h*3600;
  p->m = s/60;
  p->s += s - p->m*60;
  p->rawS = 0;
  p->validHMS = 1;
}

/*
** Compute both YMD and HMS
*/
static void computeYMD_HMS(DateTime *p){

#if !HAVE_LOCALTIME_R && !HAVE_LOCALTIME_S
  struct tm *pX;
#if SQLITE_THREADSAFE>0
  sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER);
#endif
  sqlite3_mutex_enter(mutex);
  pX = localtime(t);
#ifndef SQLITE_UNTESTABLE
  if( sqlite3GlobalConfig.bLocaltimeFault ) pX = 0;
#endif
  if( pX ) *pTm = *pX;
  sqlite3_mutex_leave(mutex);
  rc = pX==0;
#else
#ifndef SQLITE_UNTESTABLE
  if( sqlite3GlobalConfig.bLocaltimeFault ) return 1;
#endif
#if HAVE_LOCALTIME_R
  rc = localtime_r(t, pTm)==0;
#else
  rc = localtime_s(pTm, t);
#endif /* HAVE_LOCALTIME_R */

  y.D = sLocal.tm_mday;
  y.h = sLocal.tm_hour;
  y.m = sLocal.tm_min;
  y.s = sLocal.tm_sec;
  y.validYMD = 1;
  y.validHMS = 1;
  y.validJD = 0;
  y.rawS = 0;
  y.validTZ = 0;
  y.isError = 0;
  computeJD(&y);
  *pRc = SQLITE_OK;
  return y.iJD - x.iJD;
}
#endif /* SQLITE_OMIT_LOCALTIME */

/*
** The following table defines various date transformations of the form
**
**            'NNN days'
**
** Where NNN is an arbitrary floating-point number and "days" can be one
** of several units of time.
*/
static const struct {
  u8 eType;           /* Transformation type code */
  u8 nName;           /* Length of th name */
  char *zName;        /* Name of the transformation */
  double rLimit;      /* Maximum NNN value for this transform */
  double rXform;      /* Constant used for this transform */
} aXformType[] = {
  { 0, 6, "second", 464269060800.0, 86400000.0/(24.0*60.0*60.0) },
  { 0, 6, "minute", 7737817680.0,   86400000.0/(24.0*60.0)      },
  { 0, 4, "hour",   128963628.0,    86400000.0/24.0             },
  { 0, 3, "day",    5373485.0,      86400000.0                  },
  { 1, 5, "month",  176546.0,       30.0*86400000.0             },
  { 2, 4, "year",   14713.0,        365.0*86400000.0            },
};

/*
** Process a modifier to a date-time stamp.  The modifiers are
** as follows:
**
**     NNN days
**     NNN hours

**     utc
**
** Return 0 on success and 1 if there is any kind of error. If the error
** is in a system call (i.e. localtime()), then an error message is written
** to context pCtx. If the error is an unrecognized modifier, no error is
** written to pCtx.
*/
static int parseModifier(
  sqlite3_context *pCtx,      /* Function context */
  const char *z,              /* The text of the modifier */
  int n,                      /* Length of zMod in bytes */
  DateTime *p                 /* The date/time value to be modified */
){
  int rc = 1;

  double r;



  switch(sqlite3UpperToLower[(u8)z[0]] ){



#ifndef SQLITE_OMIT_LOCALTIME
    case 'l': {
      /*    localtime
      **
      ** Assuming the current time value is UTC (a.k.a. GMT), shift it to
      ** show local time.
      */
      if( sqlite3_stricmp(z, "localtime")==0 ){
        computeJD(p);
        p->iJD += localtimeOffset(p, pCtx, &rc);
        clearYMD_HMS_TZ(p);
      }
      break;
    }
#endif
    case 'u': {
      /*
      **    unixepoch
      **
      ** Treat the current value of p->s as the number of
      ** seconds since 1970.  Convert to a real julian day number.
      */
      if( sqlite3_stricmp(z, "unixepoch")==0 && p->rawS ){
        r = p->s*1000.0 + 210866760000000.0;
        if( r>=0.0 && r<464269060800000.0 ){
          clearYMD_HMS_TZ(p);
          p->iJD = (sqlite3_int64)r;
          p->validJD = 1;
          p->rawS = 0;
          rc = 0;
        }
      }
#ifndef SQLITE_OMIT_LOCALTIME
      else if( sqlite3_stricmp(z, "utc")==0 ){
        if( p->tzSet==0 ){
          sqlite3_int64 c1;
          computeJD(p);
          c1 = localtimeOffset(p, pCtx, &rc);
          if( rc==SQLITE_OK ){
            p->iJD -= c1;
            clearYMD_HMS_TZ(p);

      /*
      **    weekday N
      **
      ** Move the date to the same time on the next occurrence of
      ** weekday N where 0==Sunday, 1==Monday, and so forth.  If the
      ** date is already on the appropriate weekday, this is a no-op.
      */
      if( sqlite3_strnicmp(z, "weekday ", 8)==0
               && sqlite3AtoF(&z[8], &r, sqlite3Strlen30(&z[8]), SQLITE_UTF8)
               && (n=(int)r)==r && n>=0 && r<7 ){
        sqlite3_int64 Z;
        computeYMD_HMS(p);
        p->validTZ = 0;
        p->validJD = 0;
        computeJD(p);

    case 's': {
      /*
      **    start of TTTTT
      **
      ** Move the date backwards to the beginning of the current day,
      ** or month or year.
      */
      if( sqlite3_strnicmp(z, "start of ", 9)!=0 ) break;
      z += 9;
      computeYMD(p);
      p->validHMS = 1;
      p->h = p->m = 0;
      p->s = 0.0;
      p->validTZ = 0;
      p->validJD = 0;
      if( sqlite3_stricmp(z,"month")==0 ){
        p->D = 1;
        rc = 0;
      }else if( sqlite3_stricmp(z,"year")==0 ){
        computeYMD(p);
        p->M = 1;
        p->D = 1;
        rc = 0;
      }else if( sqlite3_stricmp(z,"day")==0 ){
        rc = 0;
      }
      break;
    }
    case '+':
    case '-':
    case '0':
    case '1':
    case '2':
    case '3':
    case '4':
    case '5':
    case '6':
    case '7':
    case '8':
    case '9': {
      double rRounder;
      int i;
      for(n=1; z[n] && z[n]!=':' && !sqlite3Isspace(z[n]); n++){}
      if( !sqlite3AtoF(z, &r, n, SQLITE_UTF8) ){
        rc = 1;
        break;
      }
      if( z[n]==':' ){
        /* A modifier of the form (+|-)HH:MM:SS.FFF adds (or subtracts) the

        if( z[0]=='-' ) tx.iJD = -tx.iJD;
        computeJD(p);
        clearYMD_HMS_TZ(p);
        p->iJD += tx.iJD;
        rc = 0;
        break;
      }

      /* If control reaches this point, it means the transformation is
      ** one of the forms like "+NNN days".  */
      z += n;
      while( sqlite3Isspace(*z) ) z++;
      n = sqlite3Strlen30(z);
      if( n>10 || n<3 ) break;
      if( sqlite3UpperToLower[(u8)z[n-1]]=='s' ) n--;
      computeJD(p);
      rc = 1;
      rRounder = r<0 ? -0.5 : +0.5;
      for(i=0; i<ArraySize(aXformType); i++){
        if( aXformType[i].nName==n
         && sqlite3_strnicmp(aXformType[i].zName, z, n)==0

         && r>-aXformType[i].rLimit && r<aXformType[i].rLimit
        ){
          switch( aXformType[i].eType ){


            case 1: { /* Special processing to add months */
              int x;
              computeYMD_HMS(p);
              p->M += (int)r;
              x = p->M>0 ? (p->M-1)/12 : (p->M-12)/12;
              p->Y += x;
              p->M -= x*12;
              p->validJD = 0;

              r -= (int)r;
              break;

            }

            case 2: { /* Special processing to add years */
              int y = (int)r;
              computeYMD_HMS(p);
              p->Y += y;
              p->validJD = 0;
              r -= (int)r;
              break;
            }
          }
          computeJD(p);

          p->iJD += (sqlite3_int64)(r*aXformType[i].rXform + rRounder);
          rc = 0;
          break;
        }


      }
      clearYMD_HMS_TZ(p);
      break;
    }
    default: {
      break;
    }

*/
static int isDate(
  sqlite3_context *context, 
  int argc, 
  sqlite3_value **argv, 
  DateTime *p
){
  int i, n;
  const unsigned char *z;
  int eType;
  memset(p, 0, sizeof(*p));
  if( argc==0 ){
    return setDateTimeToCurrent(context, p);
  }
  if( (eType = sqlite3_value_type(argv[0]))==SQLITE_FLOAT
                   || eType==SQLITE_INTEGER ){
    setRawDateNumber(p, sqlite3_value_double(argv[0]));

  }else{
    z = sqlite3_value_text(argv[0]);
    if( !z || parseDateOrTime(context, (char*)z, p) ){
      return 1;
    }
  }
  for(i=1; i<argc; i++){
    z = sqlite3_value_text(argv[i]);
    n = sqlite3_value_bytes(argv[i]);
    if( z==0 || parseModifier(context, (char*)z, n, p) ) return 1;
  }
  computeJD(p);
  if( p->isError || !validJulianDay(p->iJD) ) return 1;
  return 0;
}


/*
** The following routines implement the various date and time functions
** of SQLite.

** is completely recoverable simply by not carrying out the resize. The 
** hash table will continue to function normally.  So a malloc failure 
** during a hash table resize is a benign fault.
*/

/* #include "sqliteInt.h" */

#ifndef SQLITE_UNTESTABLE

/*
** Global variables.
*/
typedef struct BenignMallocHooks BenignMallocHooks;
static SQLITE_WSD struct BenignMallocHooks {
  void (*xBenignBegin)(void);

SQLITE_PRIVATE void sqlite3EndBenignMalloc(void){
  wsdHooksInit;
  if( wsdHooks.xBenignEnd ){
    wsdHooks.xBenignEnd();
  }
}

#endif   /* #ifndef SQLITE_UNTESTABLE */

/************** End of fault.c ***********************************************/
/************** Begin file mem0.c ********************************************/
/*
** 2008 October 28
**
** The author disclaims copyright to this source code.  In place of

/*
** Finish off a string by making sure it is zero-terminated.
** Return a pointer to the resulting string.  Return a NULL
** pointer if any kind of error was encountered.
*/
static SQLITE_NOINLINE char *strAccumFinishRealloc(StrAccum *p){
  assert( p->mxAlloc>0 && !isMalloced(p) );
  p->zText = sqlite3DbMallocRaw(p->db, p->nChar+1 );
  if( p->zText ){
    memcpy(p->zText, p->zBase, p->nChar+1);
    p->printfFlags |= SQLITE_PRINTF_MALLOCED;
  }else{
    setStrAccumError(p, STRACCUM_NOMEM);
  }
  return p->zText;
}
SQLITE_PRIVATE char *sqlite3StrAccumFinish(StrAccum *p){
  if( p->zText ){
    assert( (p->zText==p->zBase)==!isMalloced(p) );
    p->zText[p->nChar] = 0;
    if( p->mxAlloc>0 && !isMalloced(p) ){





      return strAccumFinishRealloc(p);

    }
  }
  return p->zText;
}

/*
** Reset an StrAccum string.  Reclaim all malloced memory.

    (void)SQLITE_MISUSE_BKPT;
    if( zBuf ) zBuf[0] = 0;
    return zBuf;
  }
#endif
  sqlite3StrAccumInit(&acc, 0, zBuf, n, 0);
  sqlite3VXPrintf(&acc, zFormat, ap);
  zBuf[acc.nChar] = 0;
  return zBuf;
}
SQLITE_API char *sqlite3_snprintf(int n, char *zBuf, const char *zFormat, ...){
  char *z;
  va_list ap;
  va_start(ap,zFormat);
  z = sqlite3_vsnprintf(n, zBuf, zFormat, ap);
  va_end(ap);

    wsdPrng.s[wsdPrng.j] = t;
    t += wsdPrng.s[wsdPrng.i];
    *(zBuf++) = wsdPrng.s[t];
  }while( --N );
  sqlite3_mutex_leave(mutex);
}

#ifndef SQLITE_UNTESTABLE
/*
** For testing purposes, we sometimes want to preserve the state of
** PRNG and restore the PRNG to its saved state at a later time, or
** to reset the PRNG to its initial state.  These routines accomplish
** those tasks.
**
** The sqlite3_test_control() interface calls these routines to

SQLITE_PRIVATE void sqlite3PrngRestoreState(void){
  memcpy(
    &GLOBAL(struct sqlite3PrngType, sqlite3Prng),
    &GLOBAL(struct sqlite3PrngType, sqlite3SavedPrng),
    sizeof(sqlite3Prng)
  );
}
#endif /* SQLITE_UNTESTABLE */

/************** End of random.c **********************************************/
/************** Begin file threads.c *****************************************/
/*
** 2012 July 21
**
** The author disclaims copyright to this source code.  In place of

**
** The intent of the integer argument is to let the fault simulator know
** which of multiple sqlite3FaultSim() calls has been hit.
**
** Return whatever integer value the test callback returns, or return
** SQLITE_OK if no test callback is installed.
*/
#ifndef SQLITE_UNTESTABLE
SQLITE_PRIVATE int sqlite3FaultSim(int iTest){
  int (*xCallback)(int) = sqlite3GlobalConfig.xTestCallback;
  return xCallback ? xCallback(iTest) : SQLITE_OK;
}
#endif

#ifndef SQLITE_OMIT_FLOATING_POINT

    /* 114 */ "NewRowid"         OpHelp("r[P2]=rowid"),
    /* 115 */ "Insert"           OpHelp("intkey=r[P3] data=r[P2]"),
    /* 116 */ "InsertInt"        OpHelp("intkey=P3 data=r[P2]"),
    /* 117 */ "Delete"           OpHelp(""),
    /* 118 */ "ResetCount"       OpHelp(""),
    /* 119 */ "SorterCompare"    OpHelp("if key(P1)!=trim(r[P3],P4) goto P2"),
    /* 120 */ "SorterData"       OpHelp("r[P2]=data"),

    /* 121 */ "RowData"          OpHelp("r[P2]=data"),
    /* 122 */ "Rowid"            OpHelp("r[P2]=rowid"),
    /* 123 */ "NullRow"          OpHelp(""),
    /* 124 */ "SorterInsert"     OpHelp("key=r[P2]"),
    /* 125 */ "IdxInsert"        OpHelp("key=r[P2]"),
    /* 126 */ "IdxDelete"        OpHelp("key=r[P2@P3]"),
    /* 127 */ "Seek"             OpHelp("Move P3 to P1.rowid"),
    /* 128 */ "IdxRowid"         OpHelp("r[P2]=rowid"),
    /* 129 */ "Destroy"          OpHelp(""),
    /* 130 */ "Clear"            OpHelp(""),
    /* 131 */ "ResetSorter"      OpHelp(""),
    /* 132 */ "Real"             OpHelp("r[P2]=P4"),

    /* 133 */ "CreateIndex"      OpHelp("r[P2]=root iDb=P1"),
    /* 134 */ "CreateTable"      OpHelp("r[P2]=root iDb=P1"),
    /* 135 */ "ParseSchema"      OpHelp(""),
    /* 136 */ "LoadAnalysis"     OpHelp(""),
    /* 137 */ "DropTable"        OpHelp(""),
    /* 138 */ "DropIndex"        OpHelp(""),
    /* 139 */ "DropTrigger"      OpHelp(""),
    /* 140 */ "IntegrityCk"      OpHelp(""),
    /* 141 */ "RowSetAdd"        OpHelp("rowset(P1)=r[P2]"),
    /* 142 */ "Param"            OpHelp(""),
    /* 143 */ "FkCounter"        OpHelp("fkctr[P1]+=P2"),
    /* 144 */ "MemMax"           OpHelp("r[P1]=max(r[P1],r[P2])"),
    /* 145 */ "OffsetLimit"      OpHelp("if r[P1]>0 then r[P2]=r[P1]+max(0,r[P3]) else r[P2]=(-1)"),
    /* 146 */ "AggStep0"         OpHelp("accum=r[P3] step(r[P2@P5])"),
    /* 147 */ "AggStep"          OpHelp("accum=r[P3] step(r[P2@P5])"),
    /* 148 */ "AggFinal"         OpHelp("accum=r[P1] N=P2"),
    /* 149 */ "Expire"           OpHelp(""),
    /* 150 */ "TableLock"        OpHelp("iDb=P1 root=P2 write=P3"),
    /* 151 */ "VBegin"           OpHelp(""),
    /* 152 */ "VCreate"          OpHelp(""),
    /* 153 */ "VDestroy"         OpHelp(""),
    /* 154 */ "VOpen"            OpHelp(""),
    /* 155 */ "VColumn"          OpHelp("r[P3]=vcolumn(P2)"),
    /* 156 */ "VRename"          OpHelp(""),
    /* 157 */ "Pagecount"        OpHelp(""),
    /* 158 */ "MaxPgcnt"         OpHelp(""),
    /* 159 */ "CursorHint"       OpHelp(""),
    /* 160 */ "Noop"             OpHelp(""),
    /* 161 */ "Explain"          OpHelp(""),
  };
  return azName[i];
}
#endif

/************** End of opcodes.c *********************************************/
/************** Begin file os_unix.c *****************************************/

** to locate a particular unixInodeInfo object.
*/
struct unixFileId {
  dev_t dev;                  /* Device number */
#if OS_VXWORKS
  struct vxworksFileId *pId;  /* Unique file ID for vxworks. */
#else
  /* We are told that some versions of Android contain a bug that
  ** sizes ino_t at only 32-bits instead of 64-bits. (See
  ** https://android-review.googlesource.com/#/c/115351/3/dist/sqlite3.c)
  ** To work around this, always allocate 64-bits for the inode number.  
  ** On small machines that only have 32-bit inodes, this wastes 4 bytes,
  ** but that should not be a big deal. */
  /* WAS:  ino_t ino;   */
  u64 ino;                   /* Inode number */
#endif
};

/*
** An instance of the following structure is allocated for each open
** inode.  Or, on LinuxThreads, there is one of these structures for
** each inode opened by each thread.

#endif

  memset(&fileId, 0, sizeof(fileId));
  fileId.dev = statbuf.st_dev;
#if OS_VXWORKS
  fileId.pId = pFile->pId;
#else
  fileId.ino = (u64)statbuf.st_ino;
#endif
  pInode = inodeList;
  while( pInode && memcmp(&fileId, &pInode->fileId, sizeof(fileId)) ){
    pInode = pInode->pNext;
  }
  if( pInode==0 ){
    pInode = sqlite3_malloc64( sizeof(*pInode) );

*/
static int fileHasMoved(unixFile *pFile){
#if OS_VXWORKS
  return pFile->pInode!=0 && pFile->pId!=pFile->pInode->fileId.pId;
#else
  struct stat buf;
  return pFile->pInode!=0 &&
      (osStat(pFile->zPath, &buf)!=0 
         || (u64)buf.st_ino!=pFile->pInode->fileId.ino);
#endif
}


/*
** Check a unixFile that is a database.  Verify the following:
**

  ** not searching for a reusable file descriptor are not dire.  */
  if( 0==osStat(zPath, &sStat) ){
    unixInodeInfo *pInode;

    unixEnterMutex();
    pInode = inodeList;
    while( pInode && (pInode->fileId.dev!=sStat.st_dev
                     || pInode->fileId.ino!=(u64)sStat.st_ino) ){
       pInode = pInode->pNext;
    }
    if( pInode ){
      UnixUnusedFd **pp;
      for(pp=&pInode->pUnused; *pp && (*pp)->flags!=flags; pp=&((*pp)->pNext));
      pUnused = *pp;
      if( pUnused ){

** Return the value of the iSize parameter specified when Bitvec *p
** was created.
*/
SQLITE_PRIVATE u32 sqlite3BitvecSize(Bitvec *p){
  return p->iSize;
}

#ifndef SQLITE_UNTESTABLE
/*
** Let V[] be an array of unsigned characters sufficient to hold
** up to N bits.  Let I be an integer between 0 and N.  0<=I<N.
** Then the following macros can be used to set, clear, or test
** individual bits within V.
*/
#define SETBIT(V,I)      V[I>>3] |= (1<<(I&7))

  /* Free allocated structure */
bitvec_end:
  sqlite3_free(pTmpSpace);
  sqlite3_free(pV);
  sqlite3BitvecDestroy(pBitvec);
  return rc;
}
#endif /* SQLITE_UNTESTABLE */

/************** End of bitvec.c **********************************************/
/************** Begin file pcache.c ******************************************/
/*
** 2008 August 05
**
** The author disclaims copyright to this source code.  In place of

** WAL module is using shared-memory, return false. 
*/
SQLITE_PRIVATE int sqlite3WalHeapMemory(Wal *pWal);

#ifdef SQLITE_ENABLE_SNAPSHOT
SQLITE_PRIVATE int sqlite3WalSnapshotGet(Wal *pWal, sqlite3_snapshot **ppSnapshot);
SQLITE_PRIVATE void sqlite3WalSnapshotOpen(Wal *pWal, sqlite3_snapshot *pSnapshot);
SQLITE_PRIVATE int sqlite3WalSnapshotRecover(Wal *pWal);
#endif

#ifdef SQLITE_ENABLE_ZIPVFS
/* If the WAL file is not empty, return the number of bytes of content
** stored in each frame (i.e. the db page-size when the WAL was created).
*/
SQLITE_PRIVATE int sqlite3WalFramesize(Wal *pWal);

  if( pPager->pWal ){
    sqlite3WalSnapshotOpen(pPager->pWal, pSnapshot);
  }else{
    rc = SQLITE_ERROR;
  }
  return rc;
}

/*
** If this is a WAL database, call sqlite3WalSnapshotRecover(). If this 
** is not a WAL database, return an error.
*/
SQLITE_PRIVATE int sqlite3PagerSnapshotRecover(Pager *pPager){
  int rc;
  if( pPager->pWal ){
    rc = sqlite3WalSnapshotRecover(pPager->pWal);
  }else{
    rc = SQLITE_ERROR;
  }
  return rc;
}
#endif /* SQLITE_ENABLE_SNAPSHOT */
#endif /* !SQLITE_OMIT_WAL */

#ifdef SQLITE_ENABLE_ZIPVFS
/*
** A read-lock must be held on the pager when this function is called. If
** the pager is in WAL mode and the WAL file currently contains one or more

  }else{
    assert( mxReadMark<=pWal->hdr.mxFrame );
    pWal->readLock = (i16)mxI;
  }
  return rc;
}

#ifdef SQLITE_ENABLE_SNAPSHOT
/*
** Attempt to reduce the value of the WalCkptInfo.nBackfillAttempted 
** variable so that older snapshots can be accessed. To do this, loop
** through all wal frames from nBackfillAttempted to (nBackfill+1), 
** comparing their content to the corresponding page with the database
** file, if any. Set nBackfillAttempted to the frame number of the
** first frame for which the wal file content matches the db file.
**
** This is only really safe if the file-system is such that any page 
** writes made by earlier checkpointers were atomic operations, which 
** is not always true. It is also possible that nBackfillAttempted
** may be left set to a value larger than expected, if a wal frame
** contains content that duplicate of an earlier version of the same
** page.
**
** SQLITE_OK is returned if successful, or an SQLite error code if an
** error occurs. It is not an error if nBackfillAttempted cannot be
** decreased at all.
*/
SQLITE_PRIVATE int sqlite3WalSnapshotRecover(Wal *pWal){
  int rc;

  assert( pWal->readLock>=0 );
  rc = walLockExclusive(pWal, WAL_CKPT_LOCK, 1);
  if( rc==SQLITE_OK ){
    volatile WalCkptInfo *pInfo = walCkptInfo(pWal);
    int szPage = (int)pWal->szPage;
    i64 szDb;                   /* Size of db file in bytes */

    rc = sqlite3OsFileSize(pWal->pDbFd, &szDb);
    if( rc==SQLITE_OK ){
      void *pBuf1 = sqlite3_malloc(szPage);
      void *pBuf2 = sqlite3_malloc(szPage);
      if( pBuf1==0 || pBuf2==0 ){
        rc = SQLITE_NOMEM;
      }else{
        u32 i = pInfo->nBackfillAttempted;
        for(i=pInfo->nBackfillAttempted; i>pInfo->nBackfill; i--){
          volatile ht_slot *dummy;
          volatile u32 *aPgno;      /* Array of page numbers */
          u32 iZero;                /* Frame corresponding to aPgno[0] */
          u32 pgno;                 /* Page number in db file */
          i64 iDbOff;               /* Offset of db file entry */
          i64 iWalOff;              /* Offset of wal file entry */

          rc = walHashGet(pWal, walFramePage(i), &dummy, &aPgno, &iZero);
          if( rc!=SQLITE_OK ) break;
          pgno = aPgno[i-iZero];
          iDbOff = (i64)(pgno-1) * szPage;

          if( iDbOff+szPage<=szDb ){
            iWalOff = walFrameOffset(i, szPage) + WAL_FRAME_HDRSIZE;
            rc = sqlite3OsRead(pWal->pWalFd, pBuf1, szPage, iWalOff);

            if( rc==SQLITE_OK ){
              rc = sqlite3OsRead(pWal->pDbFd, pBuf2, szPage, iDbOff);
            }

            if( rc!=SQLITE_OK || 0==memcmp(pBuf1, pBuf2, szPage) ){
              break;
            }
          }

          pInfo->nBackfillAttempted = i-1;
        }
      }

      sqlite3_free(pBuf1);
      sqlite3_free(pBuf2);
    }
    walUnlockExclusive(pWal, WAL_CKPT_LOCK, 1);
  }

  return rc;
}
#endif /* SQLITE_ENABLE_SNAPSHOT */

/*
** Begin a read transaction on the database.
**
** This routine used to be called sqlite3OpenSnapshot() and with good reason:
** it takes a snapshot of the state of the WAL and wal-index for the current
** instant in time.  The current thread will continue to use this snapshot.
** Other threads might append new content to the WAL and wal-index but

      /* It is possible that there is a checkpointer thread running 
      ** concurrent with this code. If this is the case, it may be that the
      ** checkpointer has already determined that it will checkpoint 
      ** snapshot X, where X is later in the wal file than pSnapshot, but 
      ** has not yet set the pInfo->nBackfillAttempted variable to indicate 
      ** its intent. To avoid the race condition this leads to, ensure that
      ** there is no checkpointer process by taking a shared CKPT lock 
      ** before checking pInfo->nBackfillAttempted.  
      **
      ** TODO: Does the aReadMark[] lock prevent a checkpointer from doing
      **       this already?
      */
      rc = walLockShared(pWal, WAL_CKPT_LOCK);

      if( rc==SQLITE_OK ){
        /* Check that the wal file has not been wrapped. Assuming that it has
        ** not, also check that no checkpointer has attempted to checkpoint any
        ** frames beyond pSnapshot->mxFrame. If either of these conditions are
        ** true, return SQLITE_BUSY_SNAPSHOT. Otherwise, overwrite pWal->hdr

/* Create a snapshot object.  The content of a snapshot is opaque to
** every other subsystem, so the WAL module can put whatever it needs
** in the object.
*/
SQLITE_PRIVATE int sqlite3WalSnapshotGet(Wal *pWal, sqlite3_snapshot **ppSnapshot){
  int rc = SQLITE_OK;
  WalIndexHdr *pRet;
  static const u32 aZero[4] = { 0, 0, 0, 0 };

  assert( pWal->readLock>=0 && pWal->writeLock==0 );

  if( memcmp(&pWal->hdr.aFrameCksum[0],aZero,16)==0 ){
    *ppSnapshot = 0;
    return SQLITE_ERROR;
  }
  pRet = (WalIndexHdr*)sqlite3_malloc(sizeof(WalIndexHdr));
  if( pRet==0 ){
    rc = SQLITE_NOMEM_BKPT;
  }else{
    memcpy(pRet, &pWal->hdr, sizeof(WalIndexHdr));
    *ppSnapshot = (sqlite3_snapshot*)pRet;
  }

    pCur->nKey = sqlite3BtreeIntegerKey(pCur);
  }else{
    /* For an index btree, save the complete key content */
    void *pKey;
    pCur->nKey = sqlite3BtreePayloadSize(pCur);
    pKey = sqlite3Malloc( pCur->nKey );
    if( pKey ){
      rc = sqlite3BtreePayload(pCur, 0, (int)pCur->nKey, pKey);
      if( rc==SQLITE_OK ){
        pCur->pKey = pKey;
      }else{
        sqlite3_free(pKey);
      }
    }else{
      rc = SQLITE_NOMEM_BKPT;

  if( rc==SQLITE_OK && amt>0 ){
    return SQLITE_CORRUPT_BKPT;
  }
  return rc;
}

/*
** Read part of the payload for the row at which that cursor pCur is currently
** pointing.  "amt" bytes will be transferred into pBuf[].  The transfer
** begins at "offset".
**
** pCur can be pointing to either a table or an index b-tree.
** If pointing to a table btree, then the content section is read.  If
** pCur is pointing to an index b-tree then the key section is read.
**
** For sqlite3BtreePayload(), the caller must ensure that pCur is pointing
** to a valid row in the table.  For sqlite3BtreePayloadChecked(), the
** cursor might be invalid or might need to be restored before being read.
**
** Return SQLITE_OK on success or an error code if anything goes
** wrong.  An error is returned if "offset+amt" is larger than
** the available payload.
*/
SQLITE_PRIVATE int sqlite3BtreePayload(BtCursor *pCur, u32 offset, u32 amt, void *pBuf){
  assert( cursorHoldsMutex(pCur) );
  assert( pCur->eState==CURSOR_VALID );
  assert( pCur->iPage>=0 && pCur->apPage[pCur->iPage] );
  assert( pCur->aiIdx[pCur->iPage]<pCur->apPage[pCur->iPage]->nCell );
  return accessPayload(pCur, offset, amt, (unsigned char*)pBuf, 0);
}
#ifndef SQLITE_OMIT_INCRBLOB









SQLITE_PRIVATE int sqlite3BtreePayloadChecked(BtCursor *pCur, u32 offset, u32 amt, void *pBuf){
  int rc;


  if ( pCur->eState==CURSOR_INVALID ){
    return SQLITE_ABORT;
  }


  assert( cursorOwnsBtShared(pCur) );
  rc = restoreCursorPosition(pCur);
  if( rc==SQLITE_OK ){
    assert( pCur->eState==CURSOR_VALID );
    assert( pCur->iPage>=0 && pCur->apPage[pCur->iPage] );
    assert( pCur->aiIdx[pCur->iPage]<pCur->apPage[pCur->iPage]->nCell );
    rc = accessPayload(pCur, offset, amt, pBuf, 0);
  }
  return rc;
}
#endif /* SQLITE_OMIT_INCRBLOB */

/*
** Return a pointer to payload information from the entry that the 
** pCur cursor is pointing to.  The pointer is to the beginning of
** the key if index btrees (pPage->intKey==0) and is the data for
** table btrees (pPage->intKey==1). The number of bytes of available
** key/data is written into *pAmt.  If *pAmt==0, then the value

  }

  return SQLITE_OK;
}

/*
** Move data out of a btree key or data field and into a Mem structure.
** The data is payload from the entry that pCur is currently pointing
** to.  offset and amt determine what portion of the data or key to retrieve.

** The result is written into the pMem element.
**
** The pMem object must have been initialized.  This routine will use
** pMem->zMalloc to hold the content from the btree, if possible.  New
** pMem->zMalloc space will be allocated if necessary.  The calling routine
** is responsible for making sure that the pMem object is eventually
** destroyed.
**
** If this routine fails for any reason (malloc returns NULL or unable
** to read from the disk) then the pMem is left in an inconsistent state.
*/
static SQLITE_NOINLINE int vdbeMemFromBtreeResize(
  BtCursor *pCur,   /* Cursor pointing at record to retrieve. */
  u32 offset,       /* Offset from the start of data to return bytes from. */
  u32 amt,          /* Number of bytes to return. */

  Mem *pMem         /* OUT: Return data in this Mem structure. */
){
  int rc;
  pMem->flags = MEM_Null;
  if( SQLITE_OK==(rc = sqlite3VdbeMemClearAndResize(pMem, amt+2)) ){

    rc = sqlite3BtreePayload(pCur, offset, amt, pMem->z);



    if( rc==SQLITE_OK ){
      pMem->z[amt] = 0;
      pMem->z[amt+1] = 0;
      pMem->flags = MEM_Blob|MEM_Term;
      pMem->n = (int)amt;
    }else{
      sqlite3VdbeMemRelease(pMem);
    }
  }
  return rc;
}
SQLITE_PRIVATE int sqlite3VdbeMemFromBtree(
  BtCursor *pCur,   /* Cursor pointing at record to retrieve. */
  u32 offset,       /* Offset from the start of data to return bytes from. */
  u32 amt,          /* Number of bytes to return. */

  Mem *pMem         /* OUT: Return data in this Mem structure. */
){
  char *zData;        /* Data from the btree layer */
  u32 available = 0;  /* Number of bytes available on the local btree page */
  int rc = SQLITE_OK; /* Return code */

  assert( sqlite3BtreeCursorIsValid(pCur) );
  assert( !VdbeMemDynamic(pMem) );

  /* Note: the calls to BtreeKeyFetch() and DataFetch() below assert() 
  ** that both the BtShared and database handle mutexes are held. */
  assert( (pMem->flags & MEM_RowSet)==0 );
  zData = (char *)sqlite3BtreePayloadFetch(pCur, &available);
  assert( zData!=0 );

  if( offset+amt<=available ){
    pMem->z = &zData[offset];
    pMem->flags = MEM_Blob|MEM_Ephem;
    pMem->n = (int)amt;
  }else{
    rc = vdbeMemFromBtreeResize(pCur, offset, amt, pMem);
  }

  return rc;
}

/*
** The pVal argument is known to be a value other than NULL.

  int op,             /* The new opcode */
  int p1,             /* The P1 operand */
  int p2,             /* The P2 operand */
  int p3,             /* The P3 operand */
  int p4              /* The P4 operand as an integer */
){
  int addr = sqlite3VdbeAddOp3(p, op, p1, p2, p3);
  if( p->db->mallocFailed==0 ){
    VdbeOp *pOp = &p->aOp[addr];
    pOp->p4type = P4_INT32;
    pOp->p4.i = p4;
  }
  return addr;
}

/* Insert the end of a co-routine
*/
SQLITE_PRIVATE void sqlite3VdbeEndCoroutine(Vdbe *v, int regYield){
  sqlite3VdbeAddOp1(v, OP_EndCoroutine, regYield);

    }
#ifdef SQLITE_ENABLE_CURSOR_HINTS
    case P4_EXPR: {
      sqlite3ExprDelete(db, (Expr*)p4);
      break;
    }
#endif




    case P4_FUNCDEF: {
      freeEphemeralFunction(db, (FuncDef*)p4);
      break;
    }
    case P4_MEM: {
      if( db->pnBytesFreed==0 ){
        sqlite3ValueFree((sqlite3_value*)p4);

  }else if( zP4!=0 ){
    assert( n<0 );
    pOp->p4.p = (void*)zP4;
    pOp->p4type = (signed char)n;
    if( n==P4_VTAB ) sqlite3VtabLock((VTable*)zP4);
  }
}

/*
** Change the P4 operand of the most recently coded instruction 
** to the value defined by the arguments.  This is a high-speed
** version of sqlite3VdbeChangeP4().
**
** The P4 operand must not have been previously defined.  And the new
** P4 must not be P4_INT32.  Use sqlite3VdbeChangeP4() in either of
** those cases.
*/
SQLITE_PRIVATE void sqlite3VdbeAppendP4(Vdbe *p, void *pP4, int n){
  VdbeOp *pOp;
  assert( n!=P4_INT32 && n!=P4_VTAB );
  assert( n<=0 );
  if( p->db->mallocFailed ){
    freeP4(p->db, n, pP4);
  }else{
    assert( pP4!=0 );
    assert( p->nOp>0 );
    pOp = &p->aOp[p->nOp-1];
    assert( pOp->p4type==P4_NOTUSED );
    pOp->p4type = n;
    pOp->p4.p = pP4;
  }
}

/*
** Set the P4 on the most recently added opcode to the KeyInfo for the
** index given.
*/
SQLITE_PRIVATE void sqlite3VdbeSetP4KeyInfo(Parse *pParse, Index *pIdx){
  Vdbe *v = pParse->pVdbe;
  KeyInfo *pKeyInfo;
  assert( v!=0 );
  assert( pIdx!=0 );
  pKeyInfo = sqlite3KeyInfoOfIndex(pParse, pIdx);
  if( pKeyInfo ) sqlite3VdbeAppendP4(v, pKeyInfo, P4_KEYINFO);
}

#ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
/*
** Change the comment on the most recently coded instruction.  Or
** insert a No-op and add the comment to that new instruction.  This
** makes the code easier to read during debugging.  None of this happens

      break;
    }
    case P4_FUNCDEF: {
      FuncDef *pDef = pOp->p4.pFunc;
      sqlite3XPrintf(&x, "%s(%d)", pDef->zName, pDef->nArg);
      break;
    }
#if defined(SQLITE_DEBUG) || defined(VDBE_PROFILE)
    case P4_FUNCCTX: {
      FuncDef *pDef = pOp->p4.pCtx->pFunc;
      sqlite3XPrintf(&x, "%s(%d)", pDef->zName, pDef->nArg);
      break;
    }
#endif
    case P4_INT64: {

  */
  assert( sqlite3BtreeCursorIsValid(pCur) );
  nCellKey = sqlite3BtreePayloadSize(pCur);
  assert( (nCellKey & SQLITE_MAX_U32)==(u64)nCellKey );

  /* Read in the complete content of the index entry */
  sqlite3VdbeMemInit(&m, db, 0);
  rc = sqlite3VdbeMemFromBtree(pCur, 0, (u32)nCellKey, &m);
  if( rc ){
    return rc;
  }

  /* The index entry must begin with a header size */
  (void)getVarint32((u8*)m.z, szHdr);
  testcase( szHdr==3 );

  /* nCellKey will always be between 0 and 0xffffffff because of the way
  ** that btreeParseCellPtr() and sqlite3GetVarint32() are implemented */
  if( nCellKey<=0 || nCellKey>0x7fffffff ){
    *res = 0;
    return SQLITE_CORRUPT_BKPT;
  }
  sqlite3VdbeMemInit(&m, db, 0);
  rc = sqlite3VdbeMemFromBtree(pCur, 0, (u32)nCellKey, &m);
  if( rc ){
    return rc;
  }
  *res = sqlite3VdbeRecordCompare(m.n, m.z, pUnpacked);
  sqlite3VdbeMemRelease(&m);
  return SQLITE_OK;
}

  if( p->pUnpacked==0 ){
    u32 nRec;
    u8 *aRec;

    nRec = sqlite3BtreePayloadSize(p->pCsr->uc.pCursor);
    aRec = sqlite3DbMallocRaw(db, nRec);
    if( !aRec ) goto preupdate_old_out;
    rc = sqlite3BtreePayload(p->pCsr->uc.pCursor, 0, nRec, aRec);
    if( rc==SQLITE_OK ){
      p->pUnpacked = vdbeUnpackRecord(&p->keyinfo, nRec, aRec);
      if( !p->pUnpacked ) rc = SQLITE_NOMEM;
    }
    if( rc!=SQLITE_OK ){
      sqlite3DbFree(db, aRec);
      goto preupdate_old_out;

SQLITE_API int sqlite3_found_count = 0;
#endif

/*
** Test a register to see if it exceeds the current maximum blob size.
** If it does, record the new maximum blob size.
*/
#if defined(SQLITE_TEST) && !defined(SQLITE_UNTESTABLE)
# define UPDATE_MAX_BLOBSIZE(P)  updateMaxBlobsize(P)
#else
# define UPDATE_MAX_BLOBSIZE(P)
#endif

/*
** Invoke the VDBE coverage callback, if that callback is defined.  This

  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  assert( pC!=0 );
  assert( p2<pC->nField );
  aOffset = pC->aOffset;
  assert( pC->eCurType!=CURTYPE_VTAB );
  assert( pC->eCurType!=CURTYPE_PSEUDO || pC->nullRow );
  assert( pC->eCurType!=CURTYPE_SORTER );


  if( pC->cacheStatus!=p->cacheCtr ){                /*OPTIMIZATION-IF-FALSE*/
    if( pC->nullRow ){
      if( pC->eCurType==CURTYPE_PSEUDO ){
        assert( pC->uc.pseudoTableReg>0 );
        pReg = &aMem[pC->uc.pseudoTableReg];
        assert( pReg->flags & MEM_Blob );
        assert( memIsValid(pReg) );
        pC->payloadSize = pC->szRow = avail = pReg->n;
        pC->aRow = (u8*)pReg->z;
      }else{
        sqlite3VdbeMemSetNull(pDest);
        goto op_column_out;
      }
    }else{
      pCrsr = pC->uc.pCursor;
      assert( pC->eCurType==CURTYPE_BTREE );
      assert( pCrsr );
      assert( sqlite3BtreeCursorIsValid(pCrsr) );
      pC->payloadSize = sqlite3BtreePayloadSize(pCrsr);
      pC->aRow = sqlite3BtreePayloadFetch(pCrsr, &avail);
      assert( avail<=65536 );  /* Maximum page size is 64KiB */
      if( pC->payloadSize <= (u32)avail ){

    /* If there is more header available for parsing in the record, try
    ** to extract additional fields up through the p2+1-th field 
    */
    if( pC->iHdrOffset<aOffset[0] ){
      /* Make sure zData points to enough of the record to cover the header. */
      if( pC->aRow==0 ){
        memset(&sMem, 0, sizeof(sMem));
        rc = sqlite3VdbeMemFromBtree(pC->uc.pCursor, 0, aOffset[0], &sMem);
        if( rc!=SQLITE_OK ) goto abort_due_to_error;
        zData = (u8*)sMem.z;
      }else{
        zData = pC->aRow;
      }
  
      /* Fill in pC->aType[i] and aOffset[i] values through the p2-th field. */

      **    2. the length(X) function if X is a blob, and
      **    3. if the content length is zero.
      ** So we might as well use bogus content rather than reading
      ** content from disk. */
      static u8 aZero[8];  /* This is the bogus content */
      sqlite3VdbeSerialGet(aZero, t, pDest);
    }else{
      rc = sqlite3VdbeMemFromBtree(pC->uc.pCursor, aOffset[p2], len, pDest);

      if( rc!=SQLITE_OK ) goto abort_due_to_error;
      sqlite3VdbeSerialGet((const u8*)pDest->z, t, pDest);
      pDest->flags &= ~MEM_Ephem;
    }
  }

op_column_out:

  p->apCsr[pOp->p3]->cacheStatus = CACHE_STALE;
  break;
}

/* Opcode: RowData P1 P2 * * *
** Synopsis: r[P2]=data
**
** Write into register P2 the complete row content for the row at 
** which cursor P1 is currently pointing.
** There is no interpretation of the data.  
** It is just copied onto the P2 register exactly as 
** it is found in the database file.
**






** If cursor P1 is an index, then the content is the key of the row.


** If cursor P2 is a table, then the content extracted is the data.
**
** If the P1 cursor must be pointing to a valid row (not a NULL row)
** of a real table, not a pseudo-table.
*/

case OP_RowData: {
  VdbeCursor *pC;
  BtCursor *pCrsr;
  u32 n;

  pOut = &aMem[pOp->p2];
  memAboutToChange(p, pOut);


  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  pC = p->apCsr[pOp->p1];
  assert( pC!=0 );
  assert( pC->eCurType==CURTYPE_BTREE );
  assert( isSorter(pC)==0 );


  assert( pC->nullRow==0 );
  assert( pC->uc.pCursor!=0 );
  pCrsr = pC->uc.pCursor;

  /* The OP_RowData opcodes always follow OP_NotExists or
  ** OP_SeekRowid or OP_Rewind/Op_Next with no intervening instructions
  ** that might invalidate the cursor.
  ** If this where not the case, on of the following assert()s
  ** would fail.  Should this ever change (because of changes in the code
  ** generator) then the fix would be to insert a call to
  ** sqlite3VdbeCursorMoveto().
  */

  }
  testcase( n==0 );
  if( sqlite3VdbeMemClearAndResize(pOut, MAX(n,32)) ){
    goto no_mem;
  }
  pOut->n = n;
  MemSetTypeFlag(pOut, MEM_Blob);

  rc = sqlite3BtreePayload(pCrsr, 0, n, pOut->z);



  if( rc ) goto abort_due_to_error;
  pOut->enc = SQLITE_UTF8;  /* In case the blob is ever cast to text */
  UPDATE_MAX_BLOBSIZE(pOut);
  REGISTER_TRACE(pOp->p2, pOut);
  break;
}

  }
  break;
}

/* Opcode: DecrJumpZero P1 P2 * * *
** Synopsis: if (--r[P1])==0 goto P2
**
** Register P1 must hold an integer.  Decrement the value in P1
** and jump to P2 if the new value is exactly zero.
*/
case OP_DecrJumpZero: {      /* jump, in1 */
  pIn1 = &aMem[pOp->p1];
  assert( pIn1->flags&MEM_Int );
  if( pIn1->u.i>SMALLEST_INT64 ) pIn1->u.i--;
  VdbeBranchTaken(pIn1->u.i==0, 2);
  if( pIn1->u.i==0 ) goto jump_to_p2;
  break;
}


/* Opcode: AggStep0 * P2 P3 P4 P5

  return rc;
}

/*
** Read data from a blob handle.
*/
SQLITE_API int sqlite3_blob_read(sqlite3_blob *pBlob, void *z, int n, int iOffset){
  return blobReadWrite(pBlob, z, n, iOffset, sqlite3BtreePayloadChecked);
}

/*
** Write data to a blob handle.
*/
SQLITE_API int sqlite3_blob_write(sqlite3_blob *pBlob, const void *z, int n, int iOffset){
  return blobReadWrite(pBlob, (void *)z, n, iOffset, sqlite3BtreePutData);

    ** sqlite3ExprDelete() specifically skips the recursive delete of
    ** pLeft on TK_SELECT_COLUMN nodes.  But pRight is followed, so pVector
    ** can be attached to pRight to cause this node to take ownership of
    ** pVector.  Typically there will be multiple TK_SELECT_COLUMN nodes
    ** with the same pLeft pointer to the pVector, but only one of them
    ** will own the pVector.
    */
    pRet = sqlite3PExpr(pParse, TK_SELECT_COLUMN, 0, 0);
    if( pRet ){
      pRet->iColumn = iField;
      pRet->pLeft = pVector;
    }
    assert( pRet==0 || pRet->iTable==0 );
  }else{
    if( pVector->op==TK_VECTOR ) pVector = pVector->x.pList->a[iField].pExpr;

** Expr node.  Or, if an OOM error occurs, set pParse->db->mallocFailed,
** free the subtrees and return NULL.
*/
SQLITE_PRIVATE Expr *sqlite3PExpr(
  Parse *pParse,          /* Parsing context */
  int op,                 /* Expression opcode */
  Expr *pLeft,            /* Left operand */
  Expr *pRight            /* Right operand */

){
  Expr *p;
  if( op==TK_AND && pParse->nErr==0 ){
    /* Take advantage of short-circuit false optimization for AND */
    p = sqlite3ExprAnd(pParse->db, pLeft, pRight);
  }else{
    p = sqlite3DbMallocRawNN(pParse->db, sizeof(Expr));
    if( p ){
      memset(p, 0, sizeof(Expr));
      p->op = op & TKFLG_MASK;
      p->iAgg = -1;
    }
    sqlite3ExprAttachSubtrees(pParse->db, p, pLeft, pRight);
  }
  if( p ) {
    sqlite3ExprCheckHeight(pParse, p->nHeight);
  }
  return p;
}

**   "sub-select returns N columns - expected M"
*/   
SQLITE_PRIVATE void sqlite3SubselectError(Parse *pParse, int nActual, int nExpect){
  const char *zFmt = "sub-select returns %d columns - expected %d";
  sqlite3ErrorMsg(pParse, zFmt, nActual, nExpect);
}
#endif

/*
** Expression pExpr is a vector that has been used in a context where
** it is not permitted. If pExpr is a sub-select vector, this routine 
** loads the Parse object with a message of the form:
**
**   "sub-select returns N columns - expected 1"
**
** Or, if it is a regular scalar vector:
**
**   "row value misused"
*/   
SQLITE_PRIVATE void sqlite3VectorErrorMsg(Parse *pParse, Expr *pExpr){
#ifndef SQLITE_OMIT_SUBQUERY
  if( pExpr->flags & EP_xIsSelect ){
    sqlite3SubselectError(pParse, pExpr->x.pSelect->pEList->nExpr, 1);
  }else
#endif
  {
    sqlite3ErrorMsg(pParse, "row value misused");
  }
}

/*
** Generate code for scalar subqueries used as a subquery expression, EXISTS,
** or IN operators.  Examples:
**
**     (SELECT a FROM b)          -- subquery
**     EXISTS (SELECT a FROM b)   -- EXISTS subquery

  int nVector = sqlite3ExprVectorSize(pIn->pLeft);
  if( (pIn->flags & EP_xIsSelect) ){
    if( nVector!=pIn->x.pSelect->pEList->nExpr ){
      sqlite3SubselectError(pParse, pIn->x.pSelect->pEList->nExpr, nVector);
      return 1;
    }
  }else if( nVector!=1 ){



    sqlite3VectorErrorMsg(pParse, pIn->pLeft);

    return 1;
  }
  return 0;
}
#endif

#ifndef SQLITE_OMIT_SUBQUERY

    sqlite3VdbeAddOp2(v, OP_Integer, i, iMem);
  }else{
    int c;
    i64 value;
    const char *z = pExpr->u.zToken;
    assert( z!=0 );
    c = sqlite3DecOrHexToI64(z, &value);
    if( c==1 || (c==2 && !negFlag) || (negFlag && value==SMALLEST_INT64)){



#ifdef SQLITE_OMIT_FLOATING_POINT
      sqlite3ErrorMsg(pParse, "oversized integer: %s%s", negFlag ? "-" : "", z);
#else
#ifndef SQLITE_OMIT_HEX_INTEGER
      if( sqlite3_strnicmp(z,"0x",2)==0 ){
        sqlite3ErrorMsg(pParse, "hex literal too big: %s%s", negFlag?"-":"",z);
      }else
#endif
      {
        codeReal(v, z, negFlag, iMem);
      }
#endif
    }else{
      if( negFlag ){ value = c==2 ? SMALLEST_INT64 : -value; }
      sqlite3VdbeAddOp4Dup8(v, OP_Int64, 0, iMem, 0, (u8*)&value, P4_INT64);
    }
  }
}

/*
** Erase column-cache entry number i
*/

    if( p->op==TK_SELECT ){
      iResult = sqlite3CodeSubselect(pParse, p, 0, 0);
    }else{
      int i;
      iResult = pParse->nMem+1;
      pParse->nMem += nResult;
      for(i=0; i<nResult; i++){
        sqlite3ExprCodeFactorable(pParse, p->x.pList->a[i].pExpr, i+iResult);
      }
    }
  }
  return iResult;
}

      assert( !ExprHasProperty(pExpr, EP_IntValue) );
      assert( pExpr->u.zToken!=0 );
      assert( pExpr->u.zToken[0]!=0 );
      sqlite3VdbeAddOp2(v, OP_Variable, pExpr->iColumn, target);
      if( pExpr->u.zToken[1]!=0 ){
        assert( pExpr->u.zToken[0]=='?' 
             || strcmp(pExpr->u.zToken, pParse->azVar[pExpr->iColumn-1])==0 );
        sqlite3VdbeAppendP4(v, pParse->azVar[pExpr->iColumn-1], P4_STATIC);
      }
      return target;
    }
    case TK_REGISTER: {
      return pExpr->iTable;
    }
#ifndef SQLITE_OMIT_CAST

  compRight.op = TK_LE;
  compRight.pLeft = &exprX;
  compRight.pRight = pExpr->x.pList->a[1].pExpr;
  exprToRegister(&exprX, exprCodeVector(pParse, &exprX, &regFree1));
  if( xJump ){
    xJump(pParse, &exprAnd, dest, jumpIfNull);
  }else{
    /* Mark the expression is being from the ON or USING clause of a join
    ** so that the sqlite3ExprCodeTarget() routine will not attempt to move
    ** it into the Parse.pConstExpr list.  We should use a new bit for this,
    ** for clarity, but we are out of bits in the Expr.flags field so we
    ** have to reuse the EP_FromJoin bit.  Bummer. */
    exprX.flags |= EP_FromJoin;
    sqlite3ExprCodeTarget(pParse, &exprAnd, dest);
  }
  sqlite3ReleaseTempReg(pParse, regFree1);

  /* Ensure adequate test coverage */
  testcase( xJump==sqlite3ExprIfTrue  && jumpIfNull==0 && regFree1==0 );

  **   DELETE FROM table_a WHERE col1=1 ORDER BY col2 LIMIT 1 OFFSET 1
  ** becomes:
  **   DELETE FROM table_a WHERE rowid IN ( 
  **     SELECT rowid FROM table_a WHERE col1=1 ORDER BY col2 LIMIT 1 OFFSET 1
  **   );
  */

  pSelectRowid = sqlite3PExpr(pParse, TK_ROW, 0, 0);
  if( pSelectRowid == 0 ) goto limit_where_cleanup;
  pEList = sqlite3ExprListAppend(pParse, 0, pSelectRowid);
  if( pEList == 0 ) goto limit_where_cleanup;

  /* duplicate the FROM clause as it is needed by both the DELETE/UPDATE tree
  ** and the SELECT subtree. */
  pSelectSrc = sqlite3SrcListDup(pParse->db, pSrc, 0);
  if( pSelectSrc == 0 ) {
    sqlite3ExprListDelete(pParse->db, pEList);
    goto limit_where_cleanup;
  }

  /* generate the SELECT expression tree. */
  pSelect = sqlite3SelectNew(pParse,pEList,pSelectSrc,pWhere,0,0,
                             pOrderBy,0,pLimit,pOffset);
  if( pSelect == 0 ) return 0;

  /* now generate the new WHERE rowid IN clause for the DELETE/UDPATE */
  pWhereRowid = sqlite3PExpr(pParse, TK_ROW, 0, 0);
  pInClause = pWhereRowid ? sqlite3PExpr(pParse, TK_IN, pWhereRowid, 0) : 0;
  sqlite3PExprAddSelect(pParse, pInClause, pSelect);
  return pInClause;

limit_where_cleanup:
  sqlite3ExprDelete(pParse->db, pWhere);
  sqlite3ExprListDelete(pParse->db, pOrderBy);
  sqlite3ExprDelete(pParse->db, pLimit);

      if( !IsVirtual(pTab) && aToOpen[iDataCur-iTabCur] ){
        assert( pPk!=0 || pTab->pSelect!=0 );
        sqlite3VdbeAddOp4Int(v, OP_NotFound, iDataCur, addrBypass, iKey, nKey);
        VdbeCoverage(v);
      }
    }else if( pPk ){
      addrLoop = sqlite3VdbeAddOp1(v, OP_Rewind, iEphCur); VdbeCoverage(v);
      sqlite3VdbeAddOp2(v, OP_RowData, iEphCur, iKey);
      assert( nKey==0 );  /* OP_Found will use a composite key */
    }else{
      addrLoop = sqlite3VdbeAddOp3(v, OP_RowSetRead, iRowSet, 0, iKey);
      VdbeCoverage(v);
      assert( nKey==1 );
    }  
  

  ** the update-hook is not invoked for rows removed by REPLACE, but the 
  ** pre-update-hook is.
  */ 
  if( pTab->pSelect==0 ){
    u8 p5 = 0;
    sqlite3GenerateRowIndexDelete(pParse, pTab, iDataCur, iIdxCur,0,iIdxNoSeek);
    sqlite3VdbeAddOp2(v, OP_Delete, iDataCur, (count?OPFLAG_NCHANGE:0));
    sqlite3VdbeAppendP4(v, (char*)pTab, P4_TABLE);
    if( eMode!=ONEPASS_OFF ){
      sqlite3VdbeChangeP5(v, OPFLAG_AUXDELETE);
    }
    if( iIdxNoSeek>=0 ){
      sqlite3VdbeAddOp1(v, OP_Delete, iIdxNoSeek);
    }
    if( eMode==ONEPASS_MULTI ) p5 |= OPFLAG_SAVEPOSITION;

** case.  Thus  'a' LIKE 'A' would be true. */
static const struct compareInfo likeInfoNorm = { '%', '_',   0, 1 };
/* If SQLITE_CASE_SENSITIVE_LIKE is defined, then the LIKE operator
** is case sensitive causing 'a' LIKE 'A' to be false */
static const struct compareInfo likeInfoAlt = { '%', '_',   0, 0 };

/*
** Possible error returns from patternMatch()
*/
#define SQLITE_MATCH             0
#define SQLITE_NOMATCH           1
#define SQLITE_NOWILDCARDMATCH   2

/*
** Compare two UTF-8 strings for equality where the first string is
** a GLOB or LIKE expression.  Return values:

**
**    SQLITE_MATCH:            Match
**    SQLITE_NOMATCH:          No match
**    SQLITE_NOWILDCARDMATCH:  No match in spite of having * or % wildcards.
**
** Globbing rules:
**
**      '*'       Matches any sequence of zero or more characters.
**
**      '?'       Matches exactly one character.
**

  while( (c = Utf8Read(zPattern))!=0 ){
    if( c==matchAll ){  /* Match "*" */
      /* Skip over multiple "*" characters in the pattern.  If there
      ** are also "?" characters, skip those as well, but consume a
      ** single character of the input string for each "?" skipped */
      while( (c=Utf8Read(zPattern)) == matchAll || c == matchOne ){
        if( c==matchOne && sqlite3Utf8Read(&zString)==0 ){
          return SQLITE_NOWILDCARDMATCH;
        }
      }
      if( c==0 ){
        return SQLITE_MATCH;   /* "*" at the end of the pattern matches */
      }else if( c==matchOther ){
        if( pInfo->matchSet==0 ){
          c = sqlite3Utf8Read(&zPattern);
          if( c==0 ) return SQLITE_NOWILDCARDMATCH;
        }else{
          /* "[...]" immediately follows the "*".  We have to do a slow
          ** recursive search in this case, but it is an unusual case. */
          assert( matchOther<0x80 );  /* '[' is a single-byte character */
          while( *zString ){
            int bMatch = patternCompare(&zPattern[-1],zString,pInfo,matchOther);
            if( bMatch!=SQLITE_NOMATCH ) return bMatch;
            SQLITE_SKIP_UTF8(zString);
          }
          return SQLITE_NOWILDCARDMATCH;
        }
      }

      /* At this point variable c contains the first character of the
      ** pattern string past the "*".  Search in the input string for the
      ** first matching character and recursively continue the match from
      ** that point.
      **
      ** For a case-insensitive search, set variable cx to be the same as
      ** c but in the other case and search the input string for either
      ** c or cx.
      */
      if( c<=0x80 ){
        u32 cx;
        int bMatch;
        if( noCase ){
          cx = sqlite3Toupper(c);
          c = sqlite3Tolower(c);
        }else{
          cx = c;
        }
        while( (c2 = *(zString++))!=0 ){
          if( c2!=c && c2!=cx ) continue;
          bMatch = patternCompare(zPattern,zString,pInfo,matchOther);
          if( bMatch!=SQLITE_NOMATCH ) return bMatch;
        }
      }else{
        int bMatch;
        while( (c2 = Utf8Read(zString))!=0 ){
          if( c2!=c ) continue;
          bMatch = patternCompare(zPattern,zString,pInfo,matchOther);
          if( bMatch!=SQLITE_NOMATCH ) return bMatch;
        }
      }
      return SQLITE_NOWILDCARDMATCH;
    }
    if( c==matchOther ){
      if( pInfo->matchSet==0 ){
        c = sqlite3Utf8Read(&zPattern);
        if( c==0 ) return SQLITE_NOMATCH;
        zEscaped = zPattern;
      }else{
        u32 prior_c = 0;
        int seen = 0;
        int invert = 0;
        c = sqlite3Utf8Read(&zString);
        if( c==0 ) return SQLITE_NOMATCH;
        c2 = sqlite3Utf8Read(&zPattern);
        if( c2=='^' ){
          invert = 1;
          c2 = sqlite3Utf8Read(&zPattern);
        }
        if( c2==']' ){
          if( c==']' ) seen = 1;

              seen = 1;
            }
            prior_c = c2;
          }
          c2 = sqlite3Utf8Read(&zPattern);
        }
        if( c2==0 || (seen ^ invert)==0 ){
          return SQLITE_NOMATCH;
        }
        continue;
      }
    }
    c2 = Utf8Read(zString);
    if( c==c2 ) continue;
    if( noCase  && sqlite3Tolower(c)==sqlite3Tolower(c2) && c<0x80 && c2<0x80 ){
      continue;
    }
    if( c==matchOne && zPattern!=zEscaped && c2!=0 ) continue;
    return SQLITE_NOMATCH;
  }
  return *zString==0 ? SQLITE_MATCH : SQLITE_NOMATCH;
}

/*
** The sqlite3_strglob() interface.  Return 0 on a match (like strcmp()) and
** non-zero if there is no match.
*/
SQLITE_API int sqlite3_strglob(const char *zGlobPattern, const char *zString){
  return patternCompare((u8*)zGlobPattern, (u8*)zString, &globInfo, '[');
}

/*
** The sqlite3_strlike() interface.  Return 0 on a match and non-zero for
** a miss - like strcmp().
*/
SQLITE_API int sqlite3_strlike(const char *zPattern, const char *zStr, unsigned int esc){
  return patternCompare((u8*)zPattern, (u8*)zStr, &likeInfoNorm, esc);
}

/*
** Count the number of times that the LIKE operator (or GLOB which is
** just a variation of LIKE) gets called.  This is used for testing
** only.
*/

  }else{
    escape = pInfo->matchSet;
  }
  if( zA && zB ){
#ifdef SQLITE_TEST
    sqlite3_like_count++;
#endif
    sqlite3_result_int(context, patternCompare(zB, zA, pInfo, escape)==SQLITE_MATCH);
  }
}

/*
** Implementation of the NULLIF(x,y) function.  The result is the first
** argument if the arguments are different.  The result is NULL if the
** arguments are equal to each other.

    iCol = pIdx ? pIdx->aiColumn[i] : -1;
    pLeft = exprTableRegister(pParse, pTab, regData, iCol);
    iCol = aiCol ? aiCol[i] : pFKey->aCol[0].iFrom;
    assert( iCol>=0 );
    zCol = pFKey->pFrom->aCol[iCol].zName;
    pRight = sqlite3Expr(db, TK_ID, zCol);
    pEq = sqlite3PExpr(pParse, TK_EQ, pLeft, pRight);
    pWhere = sqlite3ExprAnd(db, pWhere, pEq);
  }

  /* If the child table is the same as the parent table, then add terms
  ** to the WHERE clause that prevent this entry from being scanned.
  ** The added WHERE clause terms are like this:
  **

  if( pTab==pFKey->pFrom && nIncr>0 ){
    Expr *pNe;                    /* Expression (pLeft != pRight) */
    Expr *pLeft;                  /* Value from parent table row */
    Expr *pRight;                 /* Column ref to child table */
    if( HasRowid(pTab) ){
      pLeft = exprTableRegister(pParse, pTab, regData, -1);
      pRight = exprTableColumn(db, pTab, pSrc->a[0].iCursor, -1);
      pNe = sqlite3PExpr(pParse, TK_NE, pLeft, pRight);
    }else{
      Expr *pEq, *pAll = 0;
      Index *pPk = sqlite3PrimaryKeyIndex(pTab);
      assert( pIdx!=0 );
      for(i=0; i<pPk->nKeyCol; i++){
        i16 iCol = pIdx->aiColumn[i];
        assert( iCol>=0 );
        pLeft = exprTableRegister(pParse, pTab, regData, iCol);
        pRight = exprTableColumn(db, pTab, pSrc->a[0].iCursor, iCol);
        pEq = sqlite3PExpr(pParse, TK_EQ, pLeft, pRight);
        pAll = sqlite3ExprAnd(db, pAll, pEq);
      }
      pNe = sqlite3PExpr(pParse, TK_NOT, pAll, 0);
    }
    pWhere = sqlite3ExprAnd(db, pWhere, pNe);
  }

  /* Resolve the references in the WHERE clause. */
  memset(&sNameContext, 0, sizeof(NameContext));
  sNameContext.pSrcList = pSrc;

      /* Create the expression "OLD.zToCol = zFromCol". It is important
      ** that the "OLD.zToCol" term is on the LHS of the = operator, so
      ** that the affinity and collation sequence associated with the
      ** parent table are used for the comparison. */
      pEq = sqlite3PExpr(pParse, TK_EQ,
          sqlite3PExpr(pParse, TK_DOT, 
            sqlite3ExprAlloc(db, TK_ID, &tOld, 0),
            sqlite3ExprAlloc(db, TK_ID, &tToCol, 0)),

          sqlite3ExprAlloc(db, TK_ID, &tFromCol, 0)
      );
      pWhere = sqlite3ExprAnd(db, pWhere, pEq);

      /* For ON UPDATE, construct the next term of the WHEN clause.
      ** The final WHEN clause will be like this:
      **
      **    WHEN NOT(old.col1 IS new.col1 AND ... AND old.colN IS new.colN)
      */
      if( pChanges ){
        pEq = sqlite3PExpr(pParse, TK_IS,
            sqlite3PExpr(pParse, TK_DOT, 
              sqlite3ExprAlloc(db, TK_ID, &tOld, 0),
              sqlite3ExprAlloc(db, TK_ID, &tToCol, 0)),

            sqlite3PExpr(pParse, TK_DOT, 
              sqlite3ExprAlloc(db, TK_ID, &tNew, 0),
              sqlite3ExprAlloc(db, TK_ID, &tToCol, 0))

            );
        pWhen = sqlite3ExprAnd(db, pWhen, pEq);
      }
  
      if( action!=OE_Restrict && (action!=OE_Cascade || pChanges) ){
        Expr *pNew;
        if( action==OE_Cascade ){
          pNew = sqlite3PExpr(pParse, TK_DOT, 
            sqlite3ExprAlloc(db, TK_ID, &tNew, 0),
            sqlite3ExprAlloc(db, TK_ID, &tToCol, 0));

        }else if( action==OE_SetDflt ){
          Expr *pDflt = pFKey->pFrom->aCol[iFromCol].pDflt;
          if( pDflt ){
            pNew = sqlite3ExprDup(db, pDflt, 0);
          }else{
            pNew = sqlite3ExprAlloc(db, TK_NULL, 0, 0);
          }

      pStep->zTarget = (char *)&pStep[1];
      memcpy((char *)pStep->zTarget, zFrom, nFrom);
  
      pStep->pWhere = sqlite3ExprDup(db, pWhere, EXPRDUP_REDUCE);
      pStep->pExprList = sqlite3ExprListDup(db, pList, EXPRDUP_REDUCE);
      pStep->pSelect = sqlite3SelectDup(db, pSelect, EXPRDUP_REDUCE);
      if( pWhen ){
        pWhen = sqlite3PExpr(pParse, TK_NOT, pWhen, 0);
        pTrigger->pWhen = sqlite3ExprDup(db, pWhen, EXPRDUP_REDUCE);
      }
    }

    /* Re-enable the lookaside buffer, if it was disabled earlier. */
    db->lookaside.bDisable--;

      case OE_Abort:
        sqlite3MayAbort(pParse);
        /* Fall through */
      case OE_Rollback:
      case OE_Fail: {
        char *zMsg = sqlite3MPrintf(db, "%s.%s", pTab->zName,
                                    pTab->aCol[i].zName);
        sqlite3VdbeAddOp3(v, OP_HaltIfNull, SQLITE_CONSTRAINT_NOTNULL, onError,
                          regNewData+1+i);
        sqlite3VdbeAppendP4(v, zMsg, P4_DYNAMIC);
        sqlite3VdbeChangeP5(v, P5_ConstraintNotNull);
        VdbeCoverage(v);
        break;
      }
      case OE_Ignore: {
        sqlite3VdbeAddOp2(v, OP_IsNull, regNewData+1+i, ignoreDest);
        VdbeCoverage(v);

#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
          if( HasRowid(pTab) ){
            /* This OP_Delete opcode fires the pre-update-hook only. It does
            ** not modify the b-tree. It is more efficient to let the coming
            ** OP_Insert replace the existing entry than it is to delete the
            ** existing entry and then insert a new one. */
            sqlite3VdbeAddOp2(v, OP_Delete, iDataCur, OPFLAG_ISNOOP);
            sqlite3VdbeAppendP4(v, pTab, P4_TABLE);
          }
#endif /* SQLITE_ENABLE_PREUPDATE_HOOK */
          if( pTab->pIndex ){
            sqlite3MultiWrite(pParse);
            sqlite3GenerateRowIndexDelete(pParse, pTab, iDataCur, iIdxCur,0,-1);
          }
        }

    pik_flags |= OPFLAG_APPEND;
  }
  if( useSeekResult ){
    pik_flags |= OPFLAG_USESEEKRESULT;
  }
  sqlite3VdbeAddOp3(v, OP_Insert, iDataCur, regRec, regNewData);
  if( !pParse->nested ){
    sqlite3VdbeAppendP4(v, pTab, P4_TABLE);
  }
  sqlite3VdbeChangeP5(v, pik_flags);
}

/*
** Allocate cursors for the pTab table and all its indices and generate
** code to open and initialized those cursors.

    sqlite3VdbeSetP4KeyInfo(pParse, pSrcIdx);
    VdbeComment((v, "%s", pSrcIdx->zName));
    sqlite3VdbeAddOp3(v, OP_OpenWrite, iDest, pDestIdx->tnum, iDbDest);
    sqlite3VdbeSetP4KeyInfo(pParse, pDestIdx);
    sqlite3VdbeChangeP5(v, OPFLAG_BULKCSR);
    VdbeComment((v, "%s", pDestIdx->zName));
    addr1 = sqlite3VdbeAddOp2(v, OP_Rewind, iSrc, 0); VdbeCoverage(v);
    sqlite3VdbeAddOp2(v, OP_RowData, iSrc, regData);
    if( db->flags & SQLITE_Vacuum ){
      /* This INSERT command is part of a VACUUM operation, which guarantees
      ** that the destination table is empty. If all indexed columns use
      ** collation sequence BINARY, then it can also be assumed that the
      ** index will be populated by inserting keys in strictly sorted 
      ** order. In this case, instead of seeking within the b-tree as part
      ** of every OP_IdxInsert opcode, an OP_Last is added before the

  assert( pSrc->nSrc>iRight );
  assert( pSrc->a[iLeft].pTab );
  assert( pSrc->a[iRight].pTab );

  pE1 = sqlite3CreateColumnExpr(db, pSrc, iLeft, iColLeft);
  pE2 = sqlite3CreateColumnExpr(db, pSrc, iRight, iColRight);

  pEq = sqlite3PExpr(pParse, TK_EQ, pE1, pE2);
  if( pEq && isOuterJoin ){
    ExprSetProperty(pEq, EP_FromJoin);
    assert( !ExprHasProperty(pEq, EP_TokenOnly|EP_Reduced) );
    ExprSetVVAProperty(pEq, EP_NoReduce);
    pEq->iRightJoinTable = (i16)pE2->iTable;
  }
  *ppWhere = sqlite3ExprAnd(db, *ppWhere, pEq);

        generateColumnNames(pParse, pFirst->pSrc, pFirst->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, p->pEList, tab1,
                      0, 0, &dest, iCont, iBreak);
      sqlite3VdbeResolveLabel(v, iCont);
      sqlite3VdbeAddOp2(v, OP_Next, tab1, iStart); VdbeCoverage(v);
      sqlite3VdbeResolveLabel(v, iBreak);

  explainComposite(pParse, p->op, iSub1, iSub2, 0);
  return pParse->nErr!=0;
}
#endif

#if !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW)
/* Forward Declarations */
static void substExprList(Parse*, ExprList*, int, ExprList*);
static void substSelect(Parse*, Select *, int, ExprList*, int);

/*
** Scan through the expression pExpr.  Replace every reference to
** a column in table number iTable with a copy of the iColumn-th
** entry in pEList.  (But leave references to the ROWID column 
** unchanged.)
**
** This routine is part of the flattening procedure.  A subquery
** whose result set is defined by pEList appears as entry in the
** FROM clause of a SELECT such that the VDBE cursor assigned to that
** FORM clause entry is iTable.  This routine make the necessary 
** changes to pExpr so that it refers directly to the source table
** of the subquery rather the result set of the subquery.
*/
static Expr *substExpr(
  Parse *pParse,      /* Report errors here */
  Expr *pExpr,        /* Expr in which substitution occurs */
  int iTable,         /* Table to be substituted */
  ExprList *pEList    /* Substitute expressions */
){
  sqlite3 *db = pParse->db;
  if( pExpr==0 ) return 0;
  if( pExpr->op==TK_COLUMN && pExpr->iTable==iTable ){
    if( pExpr->iColumn<0 ){
      pExpr->op = TK_NULL;
    }else{
      Expr *pNew;
      Expr *pCopy = pEList->a[pExpr->iColumn].pExpr;
      assert( pEList!=0 && pExpr->iColumn<pEList->nExpr );
      assert( pExpr->pLeft==0 && pExpr->pRight==0 );
      if( sqlite3ExprIsVector(pCopy) ){
        sqlite3VectorErrorMsg(pParse, pCopy);
      }else{
        pNew = sqlite3ExprDup(db, pCopy, 0);
        if( pNew && (pExpr->flags & EP_FromJoin) ){
          pNew->iRightJoinTable = pExpr->iRightJoinTable;
          pNew->flags |= EP_FromJoin;
        }
        sqlite3ExprDelete(db, pExpr);
        pExpr = pNew;
      }
    }
  }else{
    pExpr->pLeft = substExpr(pParse, pExpr->pLeft, iTable, pEList);
    pExpr->pRight = substExpr(pParse, pExpr->pRight, iTable, pEList);
    if( ExprHasProperty(pExpr, EP_xIsSelect) ){
      substSelect(pParse, pExpr->x.pSelect, iTable, pEList, 1);
    }else{
      substExprList(pParse, pExpr->x.pList, iTable, pEList);
    }
  }
  return pExpr;
}
static void substExprList(
  Parse *pParse,       /* Report errors here */
  ExprList *pList,     /* List to scan and in which to make substitutes */
  int iTable,          /* Table to be substituted */
  ExprList *pEList     /* Substitute values */
){
  int i;
  if( pList==0 ) return;
  for(i=0; i<pList->nExpr; i++){
    pList->a[i].pExpr = substExpr(pParse, pList->a[i].pExpr, iTable, pEList);
  }
}
static void substSelect(
  Parse *pParse,       /* Report errors here */
  Select *p,           /* SELECT statement in which to make substitutions */
  int iTable,          /* Table to be replaced */
  ExprList *pEList,    /* Substitute values */
  int doPrior          /* Do substitutes on p->pPrior too */
){
  SrcList *pSrc;
  struct SrcList_item *pItem;
  int i;
  if( !p ) return;
  do{
    substExprList(pParse, p->pEList, iTable, pEList);
    substExprList(pParse, p->pGroupBy, iTable, pEList);
    substExprList(pParse, p->pOrderBy, iTable, pEList);
    p->pHaving = substExpr(pParse, p->pHaving, iTable, pEList);
    p->pWhere = substExpr(pParse, p->pWhere, iTable, pEList);
    pSrc = p->pSrc;
    assert( pSrc!=0 );
    for(i=pSrc->nSrc, pItem=pSrc->a; i>0; i--, pItem++){
      substSelect(pParse, pItem->pSelect, iTable, pEList, 1);
      if( pItem->fg.isTabFunc ){
        substExprList(pParse, pItem->u1.pFuncArg, iTable, pEList);
      }
    }
  }while( doPrior && (p = p->pPrior)!=0 );
}
#endif /* !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW) */

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

          sqlite3ExprDup(db, pSub->pHaving, 0), pParent->pHaving
      );
      assert( pParent->pGroupBy==0 );
      pParent->pGroupBy = sqlite3ExprListDup(db, pSub->pGroupBy, 0);
    }else{
      pParent->pWhere = sqlite3ExprAnd(db, pWhere, pParent->pWhere);
    }
    substSelect(pParse, pParent, iParent, pSub->pEList, 0);
  
    /* The flattened query is distinct if either the inner or the
    ** outer query is distinct. 
    */
    pParent->selFlags |= pSub->selFlags & SF_Distinct;
  
    /*

**   (5) The WHERE clause expression originates in the ON or USING clause
**       of a LEFT JOIN.
**
** Return 0 if no changes are made and non-zero if one or more WHERE clause
** terms are duplicated into the subquery.
*/
static int pushDownWhereTerms(
  Parse *pParse,        /* Parse context (for malloc() and error reporting) */
  Select *pSubq,        /* The subquery whose WHERE clause is to be augmented */
  Expr *pWhere,         /* The WHERE clause of the outer query */
  int iCursor           /* Cursor number of the subquery */
){
  Expr *pNew;
  int nChng = 0;
  Select *pX;           /* For looping over compound SELECTs in pSubq */
  if( pWhere==0 ) return 0;
  for(pX=pSubq; pX; pX=pX->pPrior){
    if( (pX->selFlags & (SF_Aggregate|SF_Recursive))!=0 ){
      testcase( pX->selFlags & SF_Aggregate );
      testcase( pX->selFlags & SF_Recursive );
      testcase( pX!=pSubq );
      return 0; /* restrictions (1) and (2) */
    }
  }
  if( pSubq->pLimit!=0 ){
    return 0; /* restriction (3) */
  }
  while( pWhere->op==TK_AND ){
    nChng += pushDownWhereTerms(pParse, pSubq, pWhere->pRight, iCursor);
    pWhere = pWhere->pLeft;
  }
  if( ExprHasProperty(pWhere,EP_FromJoin) ) return 0; /* restriction 5 */
  if( sqlite3ExprIsTableConstant(pWhere, iCursor) ){
    nChng++;
    while( pSubq ){
      pNew = sqlite3ExprDup(pParse->db, pWhere, 0);
      pNew = substExpr(pParse, pNew, iCursor, pSubq->pEList);
      pSubq->pWhere = sqlite3ExprAnd(pParse->db, pSubq->pWhere, pNew);
      pSubq = pSubq->pPrior;
    }
  }
  return nChng;
}
#endif /* !defined(SQLITE_OMIT_SUBQUERY) || !defined(SQLITE_OMIT_VIEW) */

            }
            pRight = sqlite3Expr(db, TK_ID, zName);
            zColname = zName;
            zToFree = 0;
            if( longNames || pTabList->nSrc>1 ){
              Expr *pLeft;
              pLeft = sqlite3Expr(db, TK_ID, zTabName);
              pExpr = sqlite3PExpr(pParse, TK_DOT, pLeft, pRight);
              if( zSchemaName ){
                pLeft = sqlite3Expr(db, TK_ID, zSchemaName);
                pExpr = sqlite3PExpr(pParse, TK_DOT, pLeft, pExpr);
              }
              if( longNames ){
                zColname = sqlite3MPrintf(db, "%s.%s", zTabName, zName);
                zToFree = zColname;
              }
            }else{
              pExpr = pRight;

static void finalizeAggFunctions(Parse *pParse, AggInfo *pAggInfo){
  Vdbe *v = pParse->pVdbe;
  int i;
  struct AggInfo_func *pF;
  for(i=0, pF=pAggInfo->aFunc; i<pAggInfo->nFunc; i++, pF++){
    ExprList *pList = pF->pExpr->x.pList;
    assert( !ExprHasProperty(pF->pExpr, EP_xIsSelect) );
    sqlite3VdbeAddOp2(v, OP_AggFinal, pF->iMem, pList ? pList->nExpr : 0);
    sqlite3VdbeAppendP4(v, pF->pFunc, P4_FUNCDEF);
  }
}

/*
** Update the accumulator memory cells for an aggregate based on
** the current cursor position.
*/

      }
      if( !pColl ){
        pColl = pParse->db->pDfltColl;
      }
      if( regHit==0 && pAggInfo->nAccumulator ) regHit = ++pParse->nMem;
      sqlite3VdbeAddOp4(v, OP_CollSeq, regHit, 0, 0, (char *)pColl, P4_COLLSEQ);
    }
    sqlite3VdbeAddOp3(v, OP_AggStep0, 0, regAgg, pF->iMem);
    sqlite3VdbeAppendP4(v, pF->pFunc, P4_FUNCDEF);
    sqlite3VdbeChangeP5(v, (u8)nArg);
    sqlite3ExprCacheAffinityChange(pParse, regAgg, nArg);
    sqlite3ReleaseTempRange(pParse, regAgg, nArg);
    if( addrNext ){
      sqlite3VdbeResolveLabel(v, addrNext);
      sqlite3ExprCacheClear(pParse);
    }

    */
    pParse->nHeight += sqlite3SelectExprHeight(p);

    /* Make copies of constant WHERE-clause terms in the outer query down
    ** inside the subquery.  This can help the subquery to run more efficiently.
    */
    if( (pItem->fg.jointype & JT_OUTER)==0
     && pushDownWhereTerms(pParse, pSub, p->pWhere, pItem->iCursor)
    ){
#if SELECTTRACE_ENABLED
      if( sqlite3SelectTrace & 0x100 ){
        SELECTTRACE(0x100,pParse,p,("After WHERE-clause push-down:\n"));
        sqlite3TreeViewSelect(0, p, 0);
      }
#endif

    u8 enc = ENC(sqlite3VdbeDb(v));
    Column *pCol = &pTab->aCol[i];
    VdbeComment((v, "%s.%s", pTab->zName, pCol->zName));
    assert( i<pTab->nCol );
    sqlite3ValueFromExpr(sqlite3VdbeDb(v), pCol->pDflt, enc, 
                         pCol->affinity, &pValue);
    if( pValue ){
      sqlite3VdbeAppendP4(v, pValue, P4_MEM);
    }
#ifndef SQLITE_OMIT_FLOATING_POINT
    if( pTab->aCol[i].affinity==SQLITE_AFF_REAL ){
      sqlite3VdbeAddOp1(v, OP_RealAffinity, iReg);
    }
#endif
  }

    labelContinue = labelBreak;
    sqlite3VdbeAddOp2(v, OP_IsNull, pPk ? regKey : regOldRowid, labelBreak);
    VdbeCoverageIf(v, pPk==0);
    VdbeCoverageIf(v, pPk!=0);
  }else if( pPk ){
    labelContinue = sqlite3VdbeMakeLabel(v);
    sqlite3VdbeAddOp2(v, OP_Rewind, iEph, labelBreak); VdbeCoverage(v);
    addrTop = sqlite3VdbeAddOp2(v, OP_RowData, iEph, regKey);
    sqlite3VdbeAddOp4Int(v, OP_NotFound, iDataCur, labelContinue, regKey, 0);
    VdbeCoverage(v);
  }else{
    labelContinue = sqlite3VdbeAddOp3(v, OP_RowSetRead, regRowSet, labelBreak,
                             regOldRowid);
    VdbeCoverage(v);
    sqlite3VdbeAddOp3(v, OP_NotExists, iDataCur, labelContinue, regOldRowid);

    assert( regNew==regNewRowid+1 );
#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
    sqlite3VdbeAddOp3(v, OP_Delete, iDataCur,
        OPFLAG_ISUPDATE | ((hasFK || chngKey || pPk!=0) ? 0 : OPFLAG_ISNOOP),
        regNewRowid
    );
    if( !pParse->nested ){
      sqlite3VdbeAppendP4(v, pTab, P4_TABLE);
    }
#else
    if( hasFK || chngKey || pPk!=0 ){
      sqlite3VdbeAddOp2(v, OP_Delete, iDataCur, 0);
    }
#endif
    if( bReplace || chngKey ){

        codeExprOrVector(pParse, pRight, iTarget, 1);
      }
    }
    sqlite3VdbeAddOp2(v, OP_Integer, pLoop->u.vtab.idxNum, iReg);
    sqlite3VdbeAddOp2(v, OP_Integer, nConstraint, iReg+1);
    sqlite3VdbeAddOp4(v, OP_VFilter, iCur, addrNotFound, iReg,
                      pLoop->u.vtab.idxStr,
                      pLoop->u.vtab.needFree ? P4_DYNAMIC : P4_STATIC);
    VdbeCoverage(v);
    pLoop->u.vtab.needFree = 0;
    pLevel->p1 = iCur;
    pLevel->op = pWInfo->eOnePass ? OP_Noop : OP_VNext;
    pLevel->p2 = sqlite3VdbeCurrentAddr(v);
    iIn = pLevel->u.in.nIn;
    for(j=nConstraint-1; j>=0; j--){

          assert( pOp->opcode!=OP_Rowid || pOp->p2==iReg+j+2 );
          testcase( pOp->opcode==OP_Rowid );
          sqlite3VdbeAddOp3(v, pOp->opcode, pOp->p1, pOp->p2, pOp->p3);
        }

        /* Generate code that will continue to the next row if 
        ** the IN constraint is not satisfied */
        pCompare = sqlite3PExpr(pParse, TK_EQ, 0, 0);
        assert( pCompare!=0 || db->mallocFailed );
        if( pCompare ){
          pCompare->pLeft = pTerm->pExpr->pLeft;
          pCompare->pRight = pRight = sqlite3Expr(db, TK_REGISTER, 0);
          if( pRight ){
            pRight->iTable = iReg+j+2;
            sqlite3ExprIfFalse(pParse, pCompare, pLevel->addrCont, 0);

        if( (pWC->a[iTerm].wtFlags & (TERM_VIRTUAL|TERM_CODED))!=0 ) continue;
        if( (pWC->a[iTerm].eOperator & WO_ALL)==0 ) continue;
        testcase( pWC->a[iTerm].wtFlags & TERM_ORINFO );
        pExpr = sqlite3ExprDup(db, pExpr, 0);
        pAndExpr = sqlite3ExprAnd(db, pAndExpr, pExpr);
      }
      if( pAndExpr ){
        pAndExpr = sqlite3PExpr(pParse, TK_AND|TKFLG_DONTFOLD, 0, pAndExpr);
      }
    }

    /* 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.
    */

        assert( pOrTerm->u.leftColumn==iColumn );
        pDup = sqlite3ExprDup(db, pOrTerm->pExpr->pRight, 0);
        pList = sqlite3ExprListAppend(pWInfo->pParse, pList, pDup);
        pLeft = pOrTerm->pExpr->pLeft;
      }
      assert( pLeft!=0 );
      pDup = sqlite3ExprDup(db, pLeft, 0);
      pNew = sqlite3PExpr(pParse, TK_IN, pDup, 0);
      if( pNew ){
        int idxNew;
        transferJoinMarkings(pNew, pExpr);
        assert( !ExprHasProperty(pNew, EP_xIsSelect) );
        pNew->x.pList = pList;
        idxNew = whereClauseInsert(pWC, pNew, TERM_VIRTUAL|TERM_DYNAMIC);
        testcase( idxNew==0 );

    assert( pList!=0 );
    assert( pList->nExpr==2 );
    for(i=0; i<2; i++){
      Expr *pNewExpr;
      int idxNew;
      pNewExpr = sqlite3PExpr(pParse, ops[i], 
                             sqlite3ExprDup(db, pExpr->pLeft, 0),
                             sqlite3ExprDup(db, pList->a[i].pExpr, 0));
      transferJoinMarkings(pNewExpr, pExpr);
      idxNew = whereClauseInsert(pWC, pNewExpr, TERM_VIRTUAL|TERM_DYNAMIC);
      testcase( idxNew==0 );
      exprAnalyze(pSrc, pWC, idxNew);
      pTerm = &pWC->a[idxTerm];
      markTermAsChild(pWC, idxNew, idxTerm);
    }

      }
      *pC = c + 1;
    }
    zCollSeqName = noCase ? "NOCASE" : "BINARY";
    pNewExpr1 = sqlite3ExprDup(db, pLeft, 0);
    pNewExpr1 = sqlite3PExpr(pParse, TK_GE,
           sqlite3ExprAddCollateString(pParse,pNewExpr1,zCollSeqName),
           pStr1);
    transferJoinMarkings(pNewExpr1, pExpr);
    idxNew1 = whereClauseInsert(pWC, pNewExpr1, wtFlags);
    testcase( idxNew1==0 );
    exprAnalyze(pSrc, pWC, idxNew1);
    pNewExpr2 = sqlite3ExprDup(db, pLeft, 0);
    pNewExpr2 = sqlite3PExpr(pParse, TK_LT,
           sqlite3ExprAddCollateString(pParse,pNewExpr2,zCollSeqName),
           pStr2);
    transferJoinMarkings(pNewExpr2, pExpr);
    idxNew2 = whereClauseInsert(pWC, pNewExpr2, wtFlags);
    testcase( idxNew2==0 );
    exprAnalyze(pSrc, pWC, idxNew2);
    pTerm = &pWC->a[idxTerm];
    if( isComplete ){
      markTermAsChild(pWC, idxNew1, idxTerm);

    pRight = pExpr->x.pList->a[0].pExpr;
    pLeft = pExpr->x.pList->a[1].pExpr;
    prereqExpr = sqlite3WhereExprUsage(pMaskSet, pRight);
    prereqColumn = sqlite3WhereExprUsage(pMaskSet, pLeft);
    if( (prereqExpr & prereqColumn)==0 ){
      Expr *pNewExpr;
      pNewExpr = sqlite3PExpr(pParse, TK_MATCH, 
                              0, sqlite3ExprDup(db, pRight, 0));
      idxNew = whereClauseInsert(pWC, pNewExpr, TERM_VIRTUAL|TERM_DYNAMIC);
      testcase( idxNew==0 );
      pNewTerm = &pWC->a[idxNew];
      pNewTerm->prereqRight = prereqExpr;
      pNewTerm->leftCursor = pLeft->iTable;
      pNewTerm->u.leftColumn = pLeft->iColumn;
      pNewTerm->eOperator = WO_MATCH;

    assert( nLeft==sqlite3ExprVectorSize(pExpr->pRight) );
    for(i=0; i<nLeft; i++){
      int idxNew;
      Expr *pNew;
      Expr *pLeft = sqlite3ExprForVectorField(pParse, pExpr->pLeft, i);
      Expr *pRight = sqlite3ExprForVectorField(pParse, pExpr->pRight, i);

      pNew = sqlite3PExpr(pParse, pExpr->op, pLeft, pRight);
      transferJoinMarkings(pNew, pExpr);
      idxNew = whereClauseInsert(pWC, pNew, TERM_DYNAMIC);
      exprAnalyze(pSrc, pWC, idxNew);
    }
    pTerm = &pWC->a[idxTerm];
    pTerm->wtFlags = TERM_CODED|TERM_VIRTUAL;  /* Disable the original */
    pTerm->eOperator = 0;

    Expr *pNewExpr;
    Expr *pLeft = pExpr->pLeft;
    int idxNew;
    WhereTerm *pNewTerm;

    pNewExpr = sqlite3PExpr(pParse, TK_GT,
                            sqlite3ExprDup(db, pLeft, 0),
                            sqlite3ExprAlloc(db, TK_NULL, 0, 0));

    idxNew = whereClauseInsert(pWC, pNewExpr,
                              TERM_VIRTUAL|TERM_DYNAMIC|TERM_VNULL);
    if( idxNew ){
      pNewTerm = &pWC->a[idxNew];
      pNewTerm->prereqRight = 0;
      pNewTerm->leftCursor = pLeft->iTable;

    }
    pColRef = sqlite3ExprAlloc(pParse->db, TK_COLUMN, 0, 0);
    if( pColRef==0 ) return;
    pColRef->iTable = pItem->iCursor;
    pColRef->iColumn = k++;
    pColRef->pTab = pTab;
    pTerm = sqlite3PExpr(pParse, TK_EQ, pColRef,
                         sqlite3ExprDup(pParse->db, pArgs->a[j].pExpr, 0));
    whereClauseInsert(pWC, pTerm, TERM_DYNAMIC);
  }
}

/************** End of whereexpr.c *******************************************/
/************** Begin file where.c *******************************************/
/*

  */
  static void spanBinaryExpr(
    Parse *pParse,      /* The parsing context.  Errors accumulate here */
    int op,             /* The binary operation */
    ExprSpan *pLeft,    /* The left operand, and output */
    ExprSpan *pRight    /* The right operand */
  ){
    pLeft->pExpr = sqlite3PExpr(pParse, op, pLeft->pExpr, pRight->pExpr);
    pLeft->zEnd = pRight->zEnd;
  }

  /* If doNot is true, then add a TK_NOT Expr-node wrapper around the
  ** outside of *ppExpr.
  */
  static void exprNot(Parse *pParse, int doNot, ExprSpan *pSpan){
    if( doNot ){
      pSpan->pExpr = sqlite3PExpr(pParse, TK_NOT, pSpan->pExpr, 0);
    }
  }

  /* Construct an expression node for a unary postfix operator
  */
  static void spanUnaryPostfix(
    Parse *pParse,         /* Parsing context to record errors */
    int op,                /* The operator */
    ExprSpan *pOperand,    /* The operand, and output */
    Token *pPostOp         /* The operand token for setting the span */
  ){
    pOperand->pExpr = sqlite3PExpr(pParse, op, pOperand->pExpr, 0);
    pOperand->zEnd = &pPostOp->z[pPostOp->n];
  }                           

  /* A routine to convert a binary TK_IS or TK_ISNOT expression into a
  ** unary TK_ISNULL or TK_NOTNULL expression. */
  static void binaryToUnaryIfNull(Parse *pParse, Expr *pY, Expr *pA, int op){
    sqlite3 *db = pParse->db;

    ExprSpan *pOut,        /* Write the new expression node here */
    Parse *pParse,         /* Parsing context to record errors */
    int op,                /* The operator */
    ExprSpan *pOperand,    /* The operand */
    Token *pPreOp         /* The operand token for setting the span */
  ){
    pOut->zStart = pPreOp->z;
    pOut->pExpr = sqlite3PExpr(pParse, op, pOperand->pExpr, 0);
    pOut->zEnd = pOperand->zEnd;
  }

  /* Add a single new term to an ExprList that is used to store a
  ** list of identifiers.  Report an error if the ID list contains
  ** a COLLATE clause or an ASC or DESC keyword, except ignore the
  ** error while parsing a legacy schema.

}

/*
** The following routine is called if the stack overflows.
*/
static void yyStackOverflow(yyParser *yypParser){
   sqlite3ParserARG_FETCH;

#ifndef NDEBUG
   if( yyTraceFILE ){
     fprintf(yyTraceFILE,"%sStack Overflow!\n",yyTracePrompt);
   }
#endif
   while( yypParser->yytos>yypParser->yystack ) yy_pop_parser_stack(yypParser);
   /* Here code is inserted which will execute if the parser

  if( (int)(yypParser->yytos - yypParser->yystack)>yypParser->yyhwm ){
    yypParser->yyhwm++;
    assert( yypParser->yyhwm == (int)(yypParser->yytos - yypParser->yystack) );
  }
#endif
#if YYSTACKDEPTH>0 
  if( yypParser->yytos>=&yypParser->yystack[YYSTACKDEPTH] ){
    yypParser->yytos--;
    yyStackOverflow(yypParser);
    return;
  }
#else
  if( yypParser->yytos>=&yypParser->yystack[yypParser->yystksz] ){
    if( yyGrowStack(yypParser) ){
      yypParser->yytos--;
      yyStackOverflow(yypParser);
      return;
    }
  }
#endif
  if( yyNewState > YY_MAX_SHIFT ){
    yyNewState += YY_MIN_REDUCE - YY_MIN_SHIFTREDUCE;

        break;
      case 31: /* ccons ::= DEFAULT LP expr RP */
{sqlite3AddDefaultValue(pParse,&yymsp[-1].minor.yy190);}
        break;
      case 33: /* ccons ::= DEFAULT MINUS term */
{
  ExprSpan v;
  v.pExpr = sqlite3PExpr(pParse, TK_UMINUS, yymsp[0].minor.yy190.pExpr, 0);
  v.zStart = yymsp[-1].minor.yy0.z;
  v.zEnd = yymsp[0].minor.yy190.zEnd;
  sqlite3AddDefaultValue(pParse,&v);
}
        break;
      case 34: /* ccons ::= DEFAULT ID|INDEXED */
{

{
  Expr *p = sqlite3Expr(pParse->db, TK_ASTERISK, 0);
  yymsp[-1].minor.yy148 = sqlite3ExprListAppend(pParse, yymsp[-1].minor.yy148, p);
}
        break;
      case 94: /* selcollist ::= sclp nm DOT STAR */
{
  Expr *pRight = sqlite3PExpr(pParse, TK_ASTERISK, 0, 0);
  Expr *pLeft = sqlite3ExprAlloc(pParse->db, TK_ID, &yymsp[-2].minor.yy0, 1);
  Expr *pDot = sqlite3PExpr(pParse, TK_DOT, pLeft, pRight);
  yymsp[-3].minor.yy148 = sqlite3ExprListAppend(pParse,yymsp[-3].minor.yy148, pDot);
}
        break;
      case 95: /* as ::= AS nm */
      case 106: /* dbnm ::= DOT nm */ yytestcase(yyruleno==106);
      case 225: /* plus_num ::= PLUS INTEGER|FLOAT */ yytestcase(yyruleno==225);
      case 226: /* minus_num ::= MINUS INTEGER|FLOAT */ yytestcase(yyruleno==226);

{spanExpr(&yymsp[0].minor.yy190,pParse,TK_ID,yymsp[0].minor.yy0); /*A-overwrites-X*/}
        break;
      case 154: /* expr ::= nm DOT nm */
{
  Expr *temp1 = sqlite3ExprAlloc(pParse->db, TK_ID, &yymsp[-2].minor.yy0, 1);
  Expr *temp2 = sqlite3ExprAlloc(pParse->db, TK_ID, &yymsp[0].minor.yy0, 1);
  spanSet(&yymsp[-2].minor.yy190,&yymsp[-2].minor.yy0,&yymsp[0].minor.yy0); /*A-overwrites-X*/
  yymsp[-2].minor.yy190.pExpr = sqlite3PExpr(pParse, TK_DOT, temp1, temp2);
}
        break;
      case 155: /* expr ::= nm DOT nm DOT nm */
{
  Expr *temp1 = sqlite3ExprAlloc(pParse->db, TK_ID, &yymsp[-4].minor.yy0, 1);
  Expr *temp2 = sqlite3ExprAlloc(pParse->db, TK_ID, &yymsp[-2].minor.yy0, 1);
  Expr *temp3 = sqlite3ExprAlloc(pParse->db, TK_ID, &yymsp[0].minor.yy0, 1);
  Expr *temp4 = sqlite3PExpr(pParse, TK_DOT, temp2, temp3);
  spanSet(&yymsp[-4].minor.yy190,&yymsp[-4].minor.yy0,&yymsp[0].minor.yy0); /*A-overwrites-X*/
  yymsp[-4].minor.yy190.pExpr = sqlite3PExpr(pParse, TK_DOT, temp1, temp4);
}
        break;
      case 158: /* term ::= INTEGER */
{
  yylhsminor.yy190.pExpr = sqlite3ExprAlloc(pParse->db, TK_INTEGER, &yymsp[0].minor.yy0, 1);
  yylhsminor.yy190.zStart = yymsp[0].minor.yy0.z;
  yylhsminor.yy190.zEnd = yymsp[0].minor.yy0.z + yymsp[0].minor.yy0.n;

    Token t = yymsp[0].minor.yy0; /*A-overwrites-X*/
    assert( t.n>=2 );
    spanSet(&yymsp[0].minor.yy190, &t, &t);
    if( pParse->nested==0 ){
      sqlite3ErrorMsg(pParse, "near \"%T\": syntax error", &t);
      yymsp[0].minor.yy190.pExpr = 0;
    }else{
      yymsp[0].minor.yy190.pExpr = sqlite3PExpr(pParse, TK_REGISTER, 0, 0);
      if( yymsp[0].minor.yy190.pExpr ) sqlite3GetInt32(&t.z[1], &yymsp[0].minor.yy190.pExpr->iTable);
    }
  }
}
        break;
      case 160: /* expr ::= expr COLLATE ID|STRING */
{
  yymsp[-2].minor.yy190.pExpr = sqlite3ExprAddCollateToken(pParse, yymsp[-2].minor.yy190.pExpr, &yymsp[0].minor.yy0, 1);
  yymsp[-2].minor.yy190.zEnd = &yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n];
}
        break;
      case 161: /* expr ::= CAST LP expr AS typetoken RP */
{
  spanSet(&yymsp[-5].minor.yy190,&yymsp[-5].minor.yy0,&yymsp[0].minor.yy0); /*A-overwrites-X*/
  yymsp[-5].minor.yy190.pExpr = sqlite3ExprAlloc(pParse->db, TK_CAST, &yymsp[-1].minor.yy0, 1);
  sqlite3ExprAttachSubtrees(pParse->db, yymsp[-5].minor.yy190.pExpr, yymsp[-3].minor.yy190.pExpr, 0);
}
        break;
      case 162: /* expr ::= ID|INDEXED LP distinct exprlist RP */
{
  if( yymsp[-1].minor.yy148 && yymsp[-1].minor.yy148->nExpr>pParse->db->aLimit[SQLITE_LIMIT_FUNCTION_ARG] ){
    sqlite3ErrorMsg(pParse, "too many arguments on function %T", &yymsp[-4].minor.yy0);
  }

  spanSet(&yylhsminor.yy190, &yymsp[0].minor.yy0, &yymsp[0].minor.yy0);
}
  yymsp[0].minor.yy190 = yylhsminor.yy190;
        break;
      case 165: /* expr ::= LP nexprlist COMMA expr RP */
{
  ExprList *pList = sqlite3ExprListAppend(pParse, yymsp[-3].minor.yy148, yymsp[-1].minor.yy190.pExpr);
  yylhsminor.yy190.pExpr = sqlite3PExpr(pParse, TK_VECTOR, 0, 0);
  if( yylhsminor.yy190.pExpr ){
    yylhsminor.yy190.pExpr->x.pList = pList;
    spanSet(&yylhsminor.yy190, &yymsp[-4].minor.yy0, &yymsp[0].minor.yy0);
  }else{
    sqlite3ExprListDelete(pParse->db, pList);
  }
}

      case 189: /* in_op ::= IN */ yytestcase(yyruleno==189);
{yymsp[0].minor.yy194 = 0;}
        break;
      case 188: /* expr ::= expr between_op expr AND expr */
{
  ExprList *pList = sqlite3ExprListAppend(pParse,0, yymsp[-2].minor.yy190.pExpr);
  pList = sqlite3ExprListAppend(pParse,pList, yymsp[0].minor.yy190.pExpr);
  yymsp[-4].minor.yy190.pExpr = sqlite3PExpr(pParse, TK_BETWEEN, yymsp[-4].minor.yy190.pExpr, 0);
  if( yymsp[-4].minor.yy190.pExpr ){
    yymsp[-4].minor.yy190.pExpr->x.pList = pList;
  }else{
    sqlite3ExprListDelete(pParse->db, pList);
  } 
  exprNot(pParse, yymsp[-3].minor.yy194, &yymsp[-4].minor.yy190);
  yymsp[-4].minor.yy190.zEnd = yymsp[0].minor.yy190.zEnd;

      **      expr1 IN ()
      **      expr1 NOT IN ()
      **
      ** simplify to constants 0 (false) and 1 (true), respectively,
      ** regardless of the value of expr1.
      */
      sqlite3ExprDelete(pParse->db, yymsp[-4].minor.yy190.pExpr);
      yymsp[-4].minor.yy190.pExpr = sqlite3ExprAlloc(pParse->db, TK_INTEGER,&sqlite3IntTokens[yymsp[-3].minor.yy194],1);
    }else if( yymsp[-1].minor.yy148->nExpr==1 ){
      /* Expressions of the form:
      **
      **      expr1 IN (?1)
      **      expr1 NOT IN (?2)
      **
      ** with exactly one value on the RHS can be simplified to something

      sqlite3ExprListDelete(pParse->db, yymsp[-1].minor.yy148);
      /* pRHS cannot be NULL because a malloc error would have been detected
      ** before now and control would have never reached this point */
      if( ALWAYS(pRHS) ){
        pRHS->flags &= ~EP_Collate;
        pRHS->flags |= EP_Generic;
      }
      yymsp[-4].minor.yy190.pExpr = sqlite3PExpr(pParse, yymsp[-3].minor.yy194 ? TK_NE : TK_EQ, yymsp[-4].minor.yy190.pExpr, pRHS);
    }else{
      yymsp[-4].minor.yy190.pExpr = sqlite3PExpr(pParse, TK_IN, yymsp[-4].minor.yy190.pExpr, 0);
      if( yymsp[-4].minor.yy190.pExpr ){
        yymsp[-4].minor.yy190.pExpr->x.pList = yymsp[-1].minor.yy148;
        sqlite3ExprSetHeightAndFlags(pParse, yymsp[-4].minor.yy190.pExpr);
      }else{
        sqlite3ExprListDelete(pParse->db, yymsp[-1].minor.yy148);
      }
      exprNot(pParse, yymsp[-3].minor.yy194, &yymsp[-4].minor.yy190);
    }
    yymsp[-4].minor.yy190.zEnd = &yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n];
  }
        break;
      case 192: /* expr ::= LP select RP */
{
    spanSet(&yymsp[-2].minor.yy190,&yymsp[-2].minor.yy0,&yymsp[0].minor.yy0); /*A-overwrites-B*/
    yymsp[-2].minor.yy190.pExpr = sqlite3PExpr(pParse, TK_SELECT, 0, 0);
    sqlite3PExprAddSelect(pParse, yymsp[-2].minor.yy190.pExpr, yymsp[-1].minor.yy243);
  }
        break;
      case 193: /* expr ::= expr in_op LP select RP */
{
    yymsp[-4].minor.yy190.pExpr = sqlite3PExpr(pParse, TK_IN, yymsp[-4].minor.yy190.pExpr, 0);
    sqlite3PExprAddSelect(pParse, yymsp[-4].minor.yy190.pExpr, yymsp[-1].minor.yy243);
    exprNot(pParse, yymsp[-3].minor.yy194, &yymsp[-4].minor.yy190);
    yymsp[-4].minor.yy190.zEnd = &yymsp[0].minor.yy0.z[yymsp[0].minor.yy0.n];
  }
        break;
      case 194: /* expr ::= expr in_op nm dbnm paren_exprlist */
{
    SrcList *pSrc = sqlite3SrcListAppend(pParse->db, 0,&yymsp[-2].minor.yy0,&yymsp[-1].minor.yy0);
    Select *pSelect = sqlite3SelectNew(pParse, 0,pSrc,0,0,0,0,0,0,0);
    if( yymsp[0].minor.yy148 )  sqlite3SrcListFuncArgs(pParse, pSelect ? pSrc : 0, yymsp[0].minor.yy148);
    yymsp[-4].minor.yy190.pExpr = sqlite3PExpr(pParse, TK_IN, yymsp[-4].minor.yy190.pExpr, 0);
    sqlite3PExprAddSelect(pParse, yymsp[-4].minor.yy190.pExpr, pSelect);
    exprNot(pParse, yymsp[-3].minor.yy194, &yymsp[-4].minor.yy190);
    yymsp[-4].minor.yy190.zEnd = yymsp[-1].minor.yy0.z ? &yymsp[-1].minor.yy0.z[yymsp[-1].minor.yy0.n] : &yymsp[-2].minor.yy0.z[yymsp[-2].minor.yy0.n];
  }
        break;
      case 195: /* expr ::= EXISTS LP select RP */
{
    Expr *p;
    spanSet(&yymsp[-3].minor.yy190,&yymsp[-3].minor.yy0,&yymsp[0].minor.yy0); /*A-overwrites-B*/
    p = yymsp[-3].minor.yy190.pExpr = sqlite3PExpr(pParse, TK_EXISTS, 0, 0);
    sqlite3PExprAddSelect(pParse, p, yymsp[-1].minor.yy243);
  }
        break;
      case 196: /* expr ::= CASE case_operand case_exprlist case_else END */
{
  spanSet(&yymsp[-4].minor.yy190,&yymsp[-4].minor.yy0,&yymsp[0].minor.yy0);  /*A-overwrites-C*/
  yymsp[-4].minor.yy190.pExpr = sqlite3PExpr(pParse, TK_CASE, yymsp[-3].minor.yy72, 0);
  if( yymsp[-4].minor.yy190.pExpr ){
    yymsp[-4].minor.yy190.pExpr->x.pList = yymsp[-1].minor.yy72 ? sqlite3ExprListAppend(pParse,yymsp[-2].minor.yy148,yymsp[-1].minor.yy72) : yymsp[-2].minor.yy148;
    sqlite3ExprSetHeightAndFlags(pParse, yymsp[-4].minor.yy190.pExpr);
  }else{
    sqlite3ExprListDelete(pParse->db, yymsp[-2].minor.yy148);
    sqlite3ExprDelete(pParse->db, yymsp[-1].minor.yy72);
  }

        break;
      case 246: /* trigger_cmd ::= select */
{yymsp[0].minor.yy145 = sqlite3TriggerSelectStep(pParse->db, yymsp[0].minor.yy243); /*A-overwrites-X*/}
        break;
      case 247: /* expr ::= RAISE LP IGNORE RP */
{
  spanSet(&yymsp[-3].minor.yy190,&yymsp[-3].minor.yy0,&yymsp[0].minor.yy0);  /*A-overwrites-X*/
  yymsp[-3].minor.yy190.pExpr = sqlite3PExpr(pParse, TK_RAISE, 0, 0); 
  if( yymsp[-3].minor.yy190.pExpr ){
    yymsp[-3].minor.yy190.pExpr->affinity = OE_Ignore;
  }
}
        break;
      case 248: /* expr ::= RAISE LP raisetype COMMA nm RP */
{
  spanSet(&yymsp[-5].minor.yy190,&yymsp[-5].minor.yy0,&yymsp[0].minor.yy0);  /*A-overwrites-X*/
  yymsp[-5].minor.yy190.pExpr = sqlite3ExprAlloc(pParse->db, TK_RAISE, &yymsp[-1].minor.yy0, 1); 
  if( yymsp[-5].minor.yy190.pExpr ) {
    yymsp[-5].minor.yy190.pExpr->affinity = (char)yymsp[-3].minor.yy194;
  }
}
        break;
      case 249: /* raisetype ::= ROLLBACK */
{yymsp[0].minor.yy194 = OE_Rollback;}

}

/*
** Interface to the testing logic.
*/
SQLITE_API int sqlite3_test_control(int op, ...){
  int rc = 0;
#ifdef SQLITE_UNTESTABLE
  UNUSED_PARAMETER(op);
#else
  va_list ap;
  va_start(ap, op);
  switch( op ){

    /*

        sqlite3ResetAllSchemasOfConnection(db);
      }
      sqlite3_mutex_leave(db->mutex);
      break;
    }
  }
  va_end(ap);
#endif /* SQLITE_UNTESTABLE */
  return rc;
}

/*
** This is a utility routine, useful to VFS implementations, that checks
** to see if a database file was a URI that contained a specific query 
** parameter, and if so obtains the value of the query parameter.

SQLITE_API int sqlite3_snapshot_get(
  sqlite3 *db, 
  const char *zDb,
  sqlite3_snapshot **ppSnapshot
){
  int rc = SQLITE_ERROR;
#ifndef SQLITE_OMIT_WAL


#ifdef SQLITE_ENABLE_API_ARMOR
  if( !sqlite3SafetyCheckOk(db) ){
    return SQLITE_MISUSE_BKPT;
  }
#endif
  sqlite3_mutex_enter(db->mutex);

  if( db->autoCommit==0 ){
    int iDb = sqlite3FindDbName(db, zDb);
    if( iDb==0 || iDb>1 ){
      Btree *pBt = db->aDb[iDb].pBt;
      if( 0==sqlite3BtreeIsInTrans(pBt) ){
        rc = sqlite3BtreeBeginTrans(pBt, 0);
        if( rc==SQLITE_OK ){
          rc = sqlite3PagerSnapshotGet(sqlite3BtreePager(pBt), ppSnapshot);
        }
      }
    }
  }

  sqlite3_mutex_leave(db->mutex);
#endif   /* SQLITE_OMIT_WAL */
  return rc;

          rc = sqlite3BtreeBeginTrans(pBt, 0);
          sqlite3PagerSnapshotOpen(sqlite3BtreePager(pBt), 0);
        }
      }
    }
  }

  sqlite3_mutex_leave(db->mutex);
#endif   /* SQLITE_OMIT_WAL */
  return rc;
}

/*
** Recover as many snapshots as possible from the wal file associated with
** schema zDb of database db.
*/
SQLITE_API int sqlite3_snapshot_recover(sqlite3 *db, const char *zDb){
  int rc = SQLITE_ERROR;
  int iDb;
#ifndef SQLITE_OMIT_WAL

#ifdef SQLITE_ENABLE_API_ARMOR
  if( !sqlite3SafetyCheckOk(db) ){
    return SQLITE_MISUSE_BKPT;
  }
#endif

  sqlite3_mutex_enter(db->mutex);
  iDb = sqlite3FindDbName(db, zDb);
  if( iDb==0 || iDb>1 ){
    Btree *pBt = db->aDb[iDb].pBt;
    if( 0==sqlite3BtreeIsInReadTrans(pBt) ){
      rc = sqlite3BtreeBeginTrans(pBt, 0);
      if( rc==SQLITE_OK ){
        rc = sqlite3PagerSnapshotRecover(sqlite3BtreePager(pBt));
        sqlite3BtreeCommit(pBt);
      }
    }
  }
  sqlite3_mutex_leave(db->mutex);
#endif   /* SQLITE_OMIT_WAL */
  return rc;
}

/*
** Free a snapshot handle obtained from sqlite3_snapshot_get().

}

/*
** The following routine is called if the stack overflows.
*/
static void fts5yyStackOverflow(fts5yyParser *fts5yypParser){
   sqlite3Fts5ParserARG_FETCH;

#ifndef NDEBUG
   if( fts5yyTraceFILE ){
     fprintf(fts5yyTraceFILE,"%sStack Overflow!\n",fts5yyTracePrompt);
   }
#endif
   while( fts5yypParser->fts5yytos>fts5yypParser->fts5yystack ) fts5yy_pop_parser_stack(fts5yypParser);
   /* Here code is inserted which will execute if the parser

  if( (int)(fts5yypParser->fts5yytos - fts5yypParser->fts5yystack)>fts5yypParser->fts5yyhwm ){
    fts5yypParser->fts5yyhwm++;
    assert( fts5yypParser->fts5yyhwm == (int)(fts5yypParser->fts5yytos - fts5yypParser->fts5yystack) );
  }
#endif
#if fts5YYSTACKDEPTH>0 
  if( fts5yypParser->fts5yytos>=&fts5yypParser->fts5yystack[fts5YYSTACKDEPTH] ){
    fts5yypParser->fts5yytos--;
    fts5yyStackOverflow(fts5yypParser);
    return;
  }
#else
  if( fts5yypParser->fts5yytos>=&fts5yypParser->fts5yystack[fts5yypParser->fts5yystksz] ){
    if( fts5yyGrowStack(fts5yypParser) ){
      fts5yypParser->fts5yytos--;
      fts5yyStackOverflow(fts5yypParser);
      return;
    }
  }
#endif
  if( fts5yyNewState > fts5YY_MAX_SHIFT ){
    fts5yyNewState += fts5YY_MIN_REDUCE - fts5YY_MIN_SHIFTREDUCE;

}


/*
** Initialize all term iterators in the pNear object. If any term is found
** to match no documents at all, return immediately without initializing any
** further iterators.
**
** If an error occurs, return an SQLite error code. Otherwise, return
** SQLITE_OK. It is not considered an error if some term matches zero
** documents.
*/
static int fts5ExprNearInitAll(
  Fts5Expr *pExpr,
  Fts5ExprNode *pNode
){
  Fts5ExprNearset *pNear = pNode->pNear;
  int i;



  assert( pNode->bNomatch==0 );
  for(i=0; i<pNear->nPhrase; i++){
    Fts5ExprPhrase *pPhrase = pNear->apPhrase[i];
    if( pPhrase->nTerm==0 ){
      pNode->bEof = 1;
      return SQLITE_OK;
    }else{
      int j;
      for(j=0; j<pPhrase->nTerm; j++){
        Fts5ExprTerm *pTerm = &pPhrase->aTerm[j];
        Fts5ExprTerm *p;
        int bHit = 0;

        for(p=pTerm; p; p=p->pSynonym){
          int rc;
          if( p->pIter ){
            sqlite3Fts5IterClose(p->pIter);
            p->pIter = 0;
          }
          rc = sqlite3Fts5IndexQuery(
              pExpr->pIndex, p->zTerm, (int)strlen(p->zTerm),
              (pTerm->bPrefix ? FTS5INDEX_QUERY_PREFIX : 0) |
              (pExpr->bDesc ? FTS5INDEX_QUERY_DESC : 0),
              pNear->pColset,
              &p->pIter
          );
          assert( (rc==SQLITE_OK)==(p->pIter!=0) );
          if( rc!=SQLITE_OK ) return rc;
          if( 0==sqlite3Fts5IterEof(p->pIter) ){
            bHit = 1;
          }
        }

        if( bHit==0 ){
          pNode->bEof = 1;
          return SQLITE_OK;
        }

      }
    }
  }

  pNode->bEof = 0;
  return SQLITE_OK;
}

/*
** If pExpr is an ASC iterator, this function returns a value with the
** same sign as:
**
**   (iLhs - iRhs)

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: 2016-12-08 19:04:36 b26df26e184ec6da4b5537526c10f42a293d09b5", -1, SQLITE_TRANSIENT);
}

static int fts5Init(sqlite3 *db){
  static const sqlite3_module fts5Mod = {
    /* iVersion      */ 2,
    /* xCreate       */ fts5CreateMethod,
    /* xConnect      */ fts5ConnectMethod,

**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.16.0"
#define SQLITE_VERSION_NUMBER 3016000
#define SQLITE_SOURCE_ID      "2016-12-08 19:04:36 b26df26e184ec6da4b5537526c10f42a293d09b5"

/*
** 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

** [SAVEPOINT], and [RELEASE] cause sqlite3_stmt_readonly() to return true,
** since the statements themselves do not actually modify the database but
** rather they control the timing of when other statements modify the 
** database.  ^The [ATTACH] and [DETACH] statements also cause
** sqlite3_stmt_readonly() to return true since, while those statements
** change the configuration of a database connection, they do not make 
** changes to the content of the database files on disk.
** ^The sqlite3_stmt_readonly() interface returns true for [BEGIN] since
** [BEGIN] merely sets internal flags, but the [BEGIN|BEGIN IMMEDIATE] and
** [BEGIN|BEGIN EXCLUSIVE] commands do touch the database and so
** sqlite3_stmt_readonly() returns false for those commands.
*/
SQLITE_API int sqlite3_stmt_readonly(sqlite3_stmt *pStmt);

/*
** CAPI3REF: Determine If A Prepared Statement Has Been Reset
** METHOD: sqlite3_stmt
**

** called to get back the underlying "errno" that caused the problem, such
** as ENOSPC, EAUTH, EISDIR, and so forth.  
*/
SQLITE_API int sqlite3_system_errno(sqlite3*);

/*
** CAPI3REF: Database Snapshot
** KEYWORDS: {snapshot} {sqlite3_snapshot}
** EXPERIMENTAL
**
** An instance of the snapshot object records the state of a [WAL mode]
** database for some specific point in history.
**
** In [WAL mode], multiple [database connections] that are open on the
** same database file can each be reading a different historical version

** the most recent version.
**
** The constructor for this object is [sqlite3_snapshot_get()].  The
** [sqlite3_snapshot_open()] method causes a fresh read transaction to refer
** to an historical snapshot (if possible).  The destructor for 
** sqlite3_snapshot objects is [sqlite3_snapshot_free()].
*/
typedef struct sqlite3_snapshot {
  unsigned char hidden[48];
} sqlite3_snapshot;

/*
** CAPI3REF: Record A Database Snapshot
** EXPERIMENTAL
**
** ^The [sqlite3_snapshot_get(D,S,P)] interface attempts to make a
** new [sqlite3_snapshot] object that records the current state of
** schema S in database connection D.  ^On success, the
** [sqlite3_snapshot_get(D,S,P)] interface writes a pointer to the newly
** created [sqlite3_snapshot] object into *P and returns SQLITE_OK.
** If there is not already a read-transaction open on schema S when
** this function is called, one is opened automatically. 
**
** The following must be true for this function to succeed. If any of
** the following statements are false when sqlite3_snapshot_get() is
** called, SQLITE_ERROR is returned. The final value of *P is undefined
** in this case. 
**
** <ul>
**   <li> The database handle must be in [autocommit mode].
**
**   <li> Schema S of [database connection] D must be a [WAL mode] database.
**
**   <li> There must not be a write transaction open on schema S of database
**        connection D.
**
**   <li> One or more transactions must have been written to the current wal
**        file since it was created on disk (by any connection). This means
**        that a snapshot cannot be taken on a wal mode database with no wal 
**        file immediately after it is first opened. At least one transaction
**        must be written to it first.
** </ul>
**
** This function may also return SQLITE_NOMEM.  If it is called with the
** database handle in autocommit mode but fails for some other reason, 
** whether or not a read transaction is opened on schema S is undefined.

**
** The [sqlite3_snapshot] object returned from a successful call to
** [sqlite3_snapshot_get()] must be freed using [sqlite3_snapshot_free()]
** to avoid a memory leak.
**
** The [sqlite3_snapshot_get()] interface is only available when the
** SQLITE_ENABLE_SNAPSHOT compile-time option is used.

** snapshot, and a positive value if P1 is a newer snapshot than P2.
*/
SQLITE_API SQLITE_EXPERIMENTAL int sqlite3_snapshot_cmp(
  sqlite3_snapshot *p1,
  sqlite3_snapshot *p2
);

/*
** CAPI3REF: Recover snapshots from a wal file
** EXPERIMENTAL
**
** If all connections disconnect from a database file but do not perform
** a checkpoint, the existing wal file is opened along with the database
** file the next time the database is opened. At this point it is only
** possible to successfully call sqlite3_snapshot_open() to open the most
** recent snapshot of the database (the one at the head of the wal file),
** even though the wal file may contain other valid snapshots for which
** clients have sqlite3_snapshot handles.
**
** This function attempts to scan the wal file associated with database zDb
** of database handle db and make all valid snapshots available to
** sqlite3_snapshot_open(). It is an error if there is already a read
** transaction open on the database, or if the database is not a wal mode
** database.
**
** SQLITE_OK is returned if successful, or an SQLite error code otherwise.
*/
SQLITE_API SQLITE_EXPERIMENTAL int sqlite3_snapshot_recover(sqlite3 *db, const char *zDb);

/*
** Undo the hack that converts floating point types to integer for
** builds on processors without floating point support.
*/
#ifdef SQLITE_OMIT_FLOATING_POINT
# undef double
#endif