Fossil

**
******************************************************************************
**
** This file implements a VFS shim that allows an SQLite database to be
** appended onto the end of some other file, such as an executable.
**
** A special record must appear at the end of the file that identifies the
** file as an appended database and provides the offset to the first page
** of the exposed content. (Or, it is the length of the content prefix.)
** For best performance page 1 should be located at a disk page boundary,
** though that is not required.
**
** When opening a database using this VFS, the connection might treat
** the file as an ordinary SQLite database, or it might treat it as a
** database appended onto some other file.  The decision is made by
** applying the following rules in order:


**

**  (1)  An empty file is an ordinary database.

**
**  (2)  If the file ends with the appendvfs trailer string
**       "Start-Of-SQLite3-NNNNNNNN" that file is an appended database.
**
**  (3)  If the file begins with the standard SQLite prefix string
**       "SQLite format 3", that file is an ordinary database.
**
**  (4)  If none of the above apply and the SQLITE_OPEN_CREATE flag is
**       set, then a new database is appended to the already existing file.
**
**  (5)  Otherwise, SQLITE_CANTOPEN is returned.
**
** To avoid unnecessary complications with the PENDING_BYTE, the size of
** the file containing the database is limited to 1GB. (1000013824 bytes)
** This VFS will not read or write past the 1GB mark.  This restriction
** might be lifted in future versions.  For now, if you need a larger
** database, then keep it in a separate file.
**
** If the file being opened is a plain database (not an appended one), then
** this shim is a pass-through into the default underlying VFS. (rule 3)
**/
/* #include "sqlite3ext.h" */
SQLITE_EXTENSION_INIT1
#include <string.h>
#include <assert.h>

/* The append mark at the end of the database is:
**
**     Start-Of-SQLite3-NNNNNNNN
**     123456789 123456789 12345
**
** The NNNNNNNN represents a 64-bit big-endian unsigned integer which is
** the offset to page 1, and also the length of the prefix content.
*/
#define APND_MARK_PREFIX     "Start-Of-SQLite3-"
#define APND_MARK_PREFIX_SZ  17
#define APND_MARK_FOS_SZ      8
#define APND_MARK_SIZE       (APND_MARK_PREFIX_SZ+APND_MARK_FOS_SZ)

/*
** Maximum size of the combined prefix + database + append-mark.  This
** must be less than 0x40000000 to avoid locking issues on Windows.
*/
#define APND_MAX_SIZE  (65536*15259)

/*
** Size of storage page upon which to align appendvfs portion.
*/
#ifndef APND_ROUNDUP_BITS
#define APND_ROUNDUP_BITS 12
#endif

/*
** Forward declaration of objects used by this utility
*/
typedef struct sqlite3_vfs ApndVfs;
typedef struct ApndFile ApndFile;

/* Access to a lower-level VFS that (might) implement dynamic loading,
** access to randomness, etc.
*/
#define ORIGVFS(p)  ((sqlite3_vfs*)((p)->pAppData))
#define ORIGFILE(p) ((sqlite3_file*)(((ApndFile*)(p))+1))

/* Invariants for an open appendvfs file:
 * Once an appendvfs file is opened, it will be in one of three states:
 * State 0: Never written. Underlying file (if any) is unaltered.
 * State 1: Append mark is persisted, content write is in progress.
 * State 2: Append mark is persisted, content writes are complete.
 * 
 * State 0 is persistent in the sense that nothing will have been done
 * to the underlying file, including any attempt to convert it to an
 * appendvfs file.
 *
 * State 1 is normally transitory. However, if a write operation ends
 * abnormally (disk full, power loss, process kill, etc.), then State 1
 * may be persistent on disk with an incomplete content write-out. This
 * is logically equivalent to an interrupted write to an ordinary file,
 * where some unknown portion of to-be-written data is persisted while
 * the remainder is not. Database integrity in such cases is maintained
 * (or not) by the same measures available for ordinary file access.
 *
 * State 2 is persistent under normal circumstances (when there is no
 * abnormal termination of a write operation such that data provided
 * to the underlying VFS write method has not yet reached storage.)
 *
 * In order to maintain the state invariant, the append mark is written
 * in advance of content writes where any part of such content would
 * overwrite an existing (or yet to be written) append mark.
 */
struct ApndFile {
  /* Access to IO methods of the underlying file */
  sqlite3_file base;
  /* File offset to beginning of appended content (unchanging) */
  sqlite3_int64 iPgOne;
  /* File offset of written append-mark, or -1 if unwritten */
  sqlite3_int64 iMark;
};

/*
** Methods for ApndFile
*/
static int apndClose(sqlite3_file*);
static int apndRead(sqlite3_file*, void*, int iAmt, sqlite3_int64 iOfst);

  apndShmLock,                    /* xShmLock */
  apndShmBarrier,                 /* xShmBarrier */
  apndShmUnmap,                   /* xShmUnmap */
  apndFetch,                      /* xFetch */
  apndUnfetch                     /* xUnfetch */
};



/*
** Close an apnd-file.
*/
static int apndClose(sqlite3_file *pFile){
  pFile = ORIGFILE(pFile);
  return pFile->pMethods->xClose(pFile);
}

/*
** Read data from an apnd-file.
*/
static int apndRead(
  sqlite3_file *pFile, 
  void *zBuf, 
  int iAmt, 
  sqlite_int64 iOfst
){
  ApndFile *paf = (ApndFile *)pFile;
  pFile = ORIGFILE(pFile);
  return pFile->pMethods->xRead(pFile, zBuf, iAmt, paf->iPgOne+iOfst);
}

/*
** Add the append-mark onto what should become the end of the file.
*  If and only if this succeeds, internal ApndFile.iMark is updated.
*  Parameter iWriteEnd is the appendvfs-relative offset of the new mark.
*/
static int apndWriteMark(
  ApndFile *paf,
  sqlite3_file *pFile,
  sqlite_int64 iWriteEnd
){
  sqlite_int64 iPgOne = paf->iPgOne;
  unsigned char a[APND_MARK_SIZE];
  int i = APND_MARK_FOS_SZ;
  int rc;
  assert(pFile == ORIGFILE(paf));
  memcpy(a, APND_MARK_PREFIX, APND_MARK_PREFIX_SZ);

  while (--i >= 0) {
    a[APND_MARK_PREFIX_SZ+i] = (unsigned char)(iPgOne & 0xff);
    iPgOne >>= 8;
  }
  iWriteEnd += paf->iPgOne;
  if( SQLITE_OK==(rc = pFile->pMethods->xWrite
                  (pFile, a, APND_MARK_SIZE, iWriteEnd)) ){
    paf->iMark = iWriteEnd;
  }
  return rc;
}

/*
** Write data to an apnd-file.
*/
static int apndWrite(
  sqlite3_file *pFile,
  const void *zBuf,
  int iAmt,
  sqlite_int64 iOfst
){

  ApndFile *paf = (ApndFile *)pFile;
  sqlite_int64 iWriteEnd = iOfst + iAmt;
  if( iWriteEnd>=APND_MAX_SIZE ) return SQLITE_FULL;
  pFile = ORIGFILE(pFile);

  /* If append-mark is absent or will be overwritten, write it. */
  if( paf->iMark < 0 || paf->iPgOne + iWriteEnd > paf->iMark ){

    int rc = apndWriteMark(paf, pFile, iWriteEnd);
    if( SQLITE_OK!=rc )



      return rc;
  }


  return pFile->pMethods->xWrite(pFile, zBuf, iAmt, paf->iPgOne+iOfst);
}

/*
** Truncate an apnd-file.
*/
static int apndTruncate(sqlite3_file *pFile, sqlite_int64 size){

  ApndFile *paf = (ApndFile *)pFile;
  pFile = ORIGFILE(pFile);



  /* The append mark goes out first so truncate failure does not lose it. */
  if( SQLITE_OK!=apndWriteMark(paf, pFile, size) )

    return SQLITE_IOERR;
  /* Truncate underlying file just past append mark */
  return pFile->pMethods->xTruncate(pFile, paf->iMark+APND_MARK_SIZE);
}

/*
** Sync an apnd-file.
*/
static int apndSync(sqlite3_file *pFile, int flags){
  pFile = ORIGFILE(pFile);
  return pFile->pMethods->xSync(pFile, flags);
}

/*
** Return the current file-size of an apnd-file.
** If the append mark is not yet there, the file-size is 0.
*/
static int apndFileSize(sqlite3_file *pFile, sqlite_int64 *pSize){
  ApndFile *paf = (ApndFile *)pFile;




  *pSize = ( paf->iMark >= 0 )? (paf->iMark - paf->iPgOne) : 0;

  return SQLITE_OK;
}

/*
** Lock an apnd-file.
*/
static int apndLock(sqlite3_file *pFile, int eLock){
  pFile = ORIGFILE(pFile);

  return pFile->pMethods->xCheckReservedLock(pFile, pResOut);
}

/*
** File control method. For custom operations on an apnd-file.
*/
static int apndFileControl(sqlite3_file *pFile, int op, void *pArg){
  ApndFile *paf = (ApndFile *)pFile;
  int rc;
  pFile = ORIGFILE(pFile);
  rc = pFile->pMethods->xFileControl(pFile, op, pArg);
  if( rc==SQLITE_OK && op==SQLITE_FCNTL_VFSNAME ){
    *(char**)pArg = sqlite3_mprintf("apnd(%lld)/%z", paf->iPgOne,*(char**)pArg);
  }
  return rc;
}

/*
** Return the sector-size in bytes for an apnd-file.
*/

static int apndFetch(
  sqlite3_file *pFile,
  sqlite3_int64 iOfst,
  int iAmt,
  void **pp
){
  ApndFile *p = (ApndFile *)pFile;
  if( p->iMark < 0 || iOfst+iAmt > p->iMark)
    return SQLITE_IOERR; /* Cannot read what is not yet there. */
  pFile = ORIGFILE(pFile);
  return pFile->pMethods->xFetch(pFile, iOfst+p->iPgOne, iAmt, pp);
}

/* Release a memory-mapped page */
static int apndUnfetch(sqlite3_file *pFile, sqlite3_int64 iOfst, void *pPage){
  ApndFile *p = (ApndFile *)pFile;
  pFile = ORIGFILE(pFile);
  return pFile->pMethods->xUnfetch(pFile, iOfst+p->iPgOne, pPage);
}

/*













** Try to read the append-mark off the end of a file.  Return the
** start of the appended database if the append-mark is present.
** If there is no valid append-mark, return -1;
**
** An append-mark is only valid if the NNNNNNNN start-of-database offset
** indicates that the appended database contains at least one page.  The
** start-of-database value must be a multiple of 512.
*/
static sqlite3_int64 apndReadMark(sqlite3_int64 sz, sqlite3_file *pFile){
  int rc, i;
  sqlite3_int64 iMark;
  int msbs = 8 * (APND_MARK_FOS_SZ-1);
  unsigned char a[APND_MARK_SIZE];

  if( APND_MARK_SIZE!=(sz & 0x1ff) ) return -1;
  rc = pFile->pMethods->xRead(pFile, a, APND_MARK_SIZE, sz-APND_MARK_SIZE);
  if( rc ) return -1;
  if( memcmp(a, APND_MARK_PREFIX, APND_MARK_PREFIX_SZ)!=0 ) return -1;
  iMark = ((sqlite3_int64)(a[APND_MARK_PREFIX_SZ] & 0x7f)) << msbs;
  for(i=1; i<8; i++){
    msbs -= 8;
    iMark |= (sqlite3_int64)a[APND_MARK_PREFIX_SZ+i]<<msbs;
  }
  if( iMark > (sz - APND_MARK_SIZE - 512) ) return -1;
  if( iMark & 0x1ff ) return -1;
  return iMark;
}

static const char apvfsSqliteHdr[] = "SQLite format 3";
/*
** Check to see if the file is an appendvfs SQLite database file.
** Return true iff it is such. Parameter sz is the file's size.
*/
static int apndIsAppendvfsDatabase(sqlite3_int64 sz, sqlite3_file *pFile){
  int rc;
  char zHdr[16];
  sqlite3_int64 iMark = apndReadMark(sz, pFile);
  if( iMark>=0 ){
    /* If file has right end-marker, the expected odd size, and the
     * SQLite DB type marker where the end-marker puts it, then it
     * is an appendvfs database (to be treated as such.)
     */
    rc = pFile->pMethods->xRead(pFile, zHdr, sizeof(zHdr), iMark);
    if( SQLITE_OK==rc && memcmp(zHdr, apvfsSqliteHdr, sizeof(zHdr))==0
        && (sz & 0x1ff)== APND_MARK_SIZE && sz>=512+APND_MARK_SIZE )
      return 1; /* It's an appendvfs database */
  }
  return 0;
}

/*
** Check to see if the file is an ordinary SQLite database file.
** Return true iff so. Parameter sz is the file's size.
*/
static int apndIsOrdinaryDatabaseFile(sqlite3_int64 sz, sqlite3_file *pFile){
  char zHdr[16];
  if( apndIsAppendvfsDatabase(sz, pFile) /* rule 2 */
   || (sz & 0x1ff) != 0
   || SQLITE_OK!=pFile->pMethods->xRead(pFile, zHdr, sizeof(zHdr), 0)
   || memcmp(zHdr, apvfsSqliteHdr, sizeof(zHdr))!=0
  ){
    return 0;
  }else{
    return 1;
  }
}

/* Round-up used to get appendvfs portion to begin at a page boundary. */
#define APND_ALIGN_MASK(nbits) ((1<<nbits)-1)
#define APND_START_ROUNDUP(fsz, nbits) \
 ( ((fsz)+APND_ALIGN_MASK(nbits)) & ~(sqlite3_int64)APND_ALIGN_MASK(nbits) )

/*
** Open an apnd file handle.
*/
static int apndOpen(
  sqlite3_vfs *pVfs,
  const char *zName,
  sqlite3_file *pFile,
  int flags,
  int *pOutFlags
){
  ApndFile *p;
  sqlite3_file *pSubFile;
  sqlite3_vfs *pSubVfs;
  int rc;
  sqlite3_int64 sz;
  pSubVfs = ORIGVFS(pVfs);
  if( (flags & SQLITE_OPEN_MAIN_DB)==0 ){
    /* The appendvfs is not to be used for transient or temporary databases. */
    return pSubVfs->xOpen(pSubVfs, zName, pFile, flags, pOutFlags);
  }
  p = (ApndFile*)pFile;
  memset(p, 0, sizeof(*p));
  pSubFile = ORIGFILE(pFile);
  pFile->pMethods = &apnd_io_methods;
  rc = pSubVfs->xOpen(pSubVfs, zName, pSubFile, flags, pOutFlags);
  if( rc ) goto apnd_open_done;
  rc = pSubFile->pMethods->xFileSize(pSubFile, &sz);
  if( rc ){
    pSubFile->pMethods->xClose(pSubFile);
    goto apnd_open_done;
  }
  if( apndIsOrdinaryDatabaseFile(sz, pSubFile) ){
    memmove(pFile, pSubFile, pSubVfs->szOsFile);
    return SQLITE_OK;
  }
  /* Record that append mark has not been written until seen otherwise. */
  p->iMark = -1;
  p->iPgOne = apndReadMark(sz, pFile);
  if( p->iPgOne>=0 ){
    /* Append mark was found, infer its offset */
    p->iMark = sz - p->iPgOne - APND_MARK_SIZE;
    return SQLITE_OK;
  }
  if( (flags & SQLITE_OPEN_CREATE)==0 ){
    pSubFile->pMethods->xClose(pSubFile);
    rc = SQLITE_CANTOPEN;
  }
  /* Round newly added appendvfs location to #define'd page boundary. 
   * Note that nothing has yet been written to the underlying file.
   * The append mark will be written along with first content write.
   * Until then, the p->iMark value indicates it is not yet written.
   */
  p->iPgOne = APND_START_ROUNDUP(sz, APND_ROUNDUP_BITS);
apnd_open_done:
  if( rc ) pFile->pMethods = 0;
  return rc;
}

/*
** Delete an apnd file.
** For an appendvfs, this could mean delete the appendvfs portion,
** leaving the appendee as it was before it gained an appendvfs.
** For now, this code deletes the underlying file too.
*/
static int apndDelete(sqlite3_vfs *pVfs, const char *zPath, int dirSync){
  return ORIGVFS(pVfs)->xDelete(ORIGVFS(pVfs), zPath, dirSync);
}

/*
** All other VFS methods are pass-thrus.
*/
static int apndAccess(
  sqlite3_vfs *pVfs, 
  const char *zPath, 
  int flags, 
  int *pResOut
){
  return ORIGVFS(pVfs)->xAccess(ORIGVFS(pVfs), zPath, flags, pResOut);

    }
  }else{
    sqlite3_int64 m, e, a;
    double r;
    int isNeg = 0;
    m = sqlite3_value_int64(argv[0]);
    e = sqlite3_value_int64(argv[1]);

    /* Limit the range of e.  Ticket 22dea1cfdb9151e4 2021-03-02 */
    if( e>10000 ){
      e = 10000;
    }else if( e<-10000 ){
      e = -10000;
    }

    if( m<0 ){
      isNeg = 1;
      m = -m;
      if( m<0 ) return;
    }else if( m==0 && e>-1000 && e<1000 ){
      sqlite3_result_double(context, 0.0);
      return;

            argv[0], argv[argc-1]);
    exit(1);
  }
  return argv[i];
}

#ifndef SQLITE_SHELL_IS_UTF8
#  if (defined(_WIN32) || defined(WIN32)) \
   && (defined(_MSC_VER) || (defined(UNICODE) && defined(__GNUC__)))
#    define SQLITE_SHELL_IS_UTF8          (0)
#  else
#    define SQLITE_SHELL_IS_UTF8          (1)
#  endif
#endif

#if SQLITE_SHELL_IS_UTF8

**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.35.0"
#define SQLITE_VERSION_NUMBER 3035000
#define SQLITE_SOURCE_ID      "2021-03-09 21:20:12 9645fe1a050e8b61aea1fba2f142819c387ecb043741392c5719bf7ad303bf8b"

/*
** 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

** <dd> ^This option is used to enable or disable [CREATE VIEW | views].
** There should be two additional arguments.
** The first argument is an integer which is 0 to disable views,
** positive to enable views or negative to leave the setting unchanged.
** The second parameter is a pointer to an integer into which
** is written 0 or 1 to indicate whether views are disabled or enabled
** following this call.  The second parameter may be a NULL pointer, in
** which case the view setting is not reported back.
**
** <p>Originally this option disabled all views.  ^(However, since
** SQLite version 3.35.0, TEMP views are still allowed even if
** this option is off.  So, in other words, this option now only disables
** views in the main database schema or in the schemas of ATTACH-ed
** databases.)^ </dd>
**
** [[SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER]]
** <dt>SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER</dt>
** <dd> ^This option is used to enable or disable the
** [fts3_tokenizer()] function which is part of the
** [FTS3] full-text search engine extension.
** There should be two additional arguments.

SQLITE_PRIVATE int sqlite3BtreeCursorRestore(BtCursor*, int*);
SQLITE_PRIVATE int sqlite3BtreeDelete(BtCursor*, u8 flags);

/* Allowed flags for sqlite3BtreeDelete() and sqlite3BtreeInsert() */
#define BTREE_SAVEPOSITION 0x02  /* Leave cursor pointing at NEXT or PREV */
#define BTREE_AUXDELETE    0x04  /* not the primary delete operation */
#define BTREE_APPEND       0x08  /* Insert is likely an append */
#define BTREE_PREFORMAT    0x80  /* Inserted data is a preformated cell */

/* An instance of the BtreePayload object describes the content of a single
** entry in either an index or table btree.
**
** Index btrees (used for indexes and also WITHOUT ROWID tables) contain
** an arbitrary key and no data.  These btrees have pKey,nKey set to the
** key and the pData,nData,nZero fields are uninitialized.  The aMem,nMem

SQLITE_PRIVATE Schema *sqlite3SchemaGet(sqlite3 *, Btree *);
SQLITE_PRIVATE int sqlite3SchemaToIndex(sqlite3 *db, Schema *);
SQLITE_PRIVATE KeyInfo *sqlite3KeyInfoAlloc(sqlite3*,int,int);
SQLITE_PRIVATE void sqlite3KeyInfoUnref(KeyInfo*);
SQLITE_PRIVATE KeyInfo *sqlite3KeyInfoRef(KeyInfo*);
SQLITE_PRIVATE KeyInfo *sqlite3KeyInfoOfIndex(Parse*, Index*);
SQLITE_PRIVATE KeyInfo *sqlite3KeyInfoFromExprList(Parse*, ExprList*, int, int);
SQLITE_PRIVATE const char *sqlite3SelectOpName(int);
SQLITE_PRIVATE int sqlite3HasExplicitNulls(Parse*, ExprList*);

#ifdef SQLITE_DEBUG
SQLITE_PRIVATE int sqlite3KeyInfoIsWriteable(KeyInfo*);
#endif
SQLITE_PRIVATE int sqlite3CreateFunc(sqlite3 *, const char *, int, int, void *,
  void (*)(sqlite3_context*,int,sqlite3_value **),

  }
  if( p->mxAlloc==0 ){
    setStrAccumError(p, SQLITE_TOOBIG);
    return p->nAlloc - p->nChar - 1;
  }else{
    char *zOld = isMalloced(p) ? p->zText : 0;
    i64 szNew = p->nChar;
    szNew += (sqlite3_int64)N + 1;
    if( szNew+p->nChar<=p->mxAlloc ){
      /* Force exponential buffer size growth as long as it does not overflow,
      ** to avoid having to call this routine too often */
      szNew += p->nChar;
    }
    if( szNew > p->mxAlloc ){
      sqlite3_str_reset(p);

** non-zero.  The P2 opcode must be 1.
*/
case OP_ChngCntRow: {
  assert( pOp->p2==1 );
  if( (rc = sqlite3VdbeCheckFk(p,0))!=SQLITE_OK ){
    goto abort_due_to_error;
  }
  /* Fall through to the next case, OP_ResultRow */
  /* no break */ deliberate_fall_through
}

/* Opcode: ResultRow P1 P2 * * *
** Synopsis: output=r[P1@P2]
**
** The registers P1 through P1+P2-1 contain a single row of

    memjrnlFreeChunks(p->pFirst);
    p->pFirst = 0;
  }else{
    i64 iOff = p->nChunkSize;
    for(pIter=p->pFirst; ALWAYS(pIter) && iOff<=size; pIter=pIter->pNext){
      iOff += p->nChunkSize;
    }
    if( ALWAYS(pIter) ){
      memjrnlFreeChunks(pIter->pNext);
      pIter->pNext = 0;
    }
  }

  p->endpoint.pChunk = pIter;
  p->endpoint.iOffset = size;

        }
        if( iCol>=pTab->nCol && sqlite3IsRowid(zCol) && VisibleRowid(pTab) ){
          /* IMP: R-51414-32910 */
          iCol = -1;
        }
        if( iCol<pTab->nCol ){
          cnt++;
          pMatch = 0;
#ifndef SQLITE_OMIT_UPSERT
          if( pExpr->iTable==EXCLUDED_TABLE_NUMBER ){
            testcase( iCol==(-1) );
            if( IN_RENAME_OBJECT ){
              pExpr->iColumn = iCol;
              pExpr->y.pTab = pTab;
              eNewExprOp = TK_COLUMN;
            }else{
              pExpr->iTable = pNC->uNC.pUpsert->regData +
                 sqlite3TableColumnToStorage(pTab, iCol);
              eNewExprOp = TK_REGISTER;
            }
          }else
#endif /* SQLITE_OMIT_UPSERT */
          {
            pExpr->y.pTab = pTab;
            if( pParse->bReturning ){
              eNewExprOp = TK_REGISTER;
              pExpr->iTable = pNC->uNC.iBaseReg + (pTab->nCol+1)*pExpr->iTable +
                 sqlite3TableColumnToStorage(pTab, iCol) + 1;
            }else{
              pExpr->iColumn = (i16)iCol;
              eNewExprOp = TK_TRIGGER;
#ifndef SQLITE_OMIT_TRIGGER
              if( iCol<0 ){
                pExpr->affExpr = SQLITE_AFF_INTEGER;
              }else if( pExpr->iTable==0 ){

    pExpr->pRight = 0;
  }
  pExpr->op = eNewExprOp;
  ExprSetProperty(pExpr, EP_Leaf);
lookupname_end:
  if( cnt==1 ){
    assert( pNC!=0 );
#ifndef SQLITE_OMIT_AUTHORIZATION
    if( pParse->db->xAuth
     && (pExpr->op==TK_COLUMN || pExpr->op==TK_TRIGGER)
    ){
      sqlite3AuthRead(pParse, pExpr, pSchema, pNC->pSrcList);
    }
#endif
    /* Increment the nRef value on all name contexts from TopNC up to
    ** the point where the name matched. */
    for(;;){
      assert( pTopNC!=0 );
      pTopNC->nRef++;
      if( pTopNC==pNC ) break;
      pTopNC = pTopNC->pNext;

      pExpr->y.pTab = pItem->pTab;
      pExpr->iTable = pItem->iCursor;
      pExpr->iColumn--;
      pExpr->affExpr = SQLITE_AFF_INTEGER;
      break;
    }

    /* An optimization:  Attempt to convert
    **
    **      "expr IS NOT NULL"  -->  "TRUE"

    **      "expr IS NULL"      -->  "FALSE"
    **
    ** if we can prove that "expr" is never NULL.  Call this the
    ** "NOT NULL strength reduction optimization".
    **
    ** If this optimization occurs, also restore the NameContext ref-counts
    ** to the state they where in before the "column" LHS expression was
    ** resolved.  This prevents "column" from being counted as having been
    ** referenced, which might prevent a SELECT from being erroneously
    ** marked as correlated.
    */
    case TK_NOTNULL:
    case TK_ISNULL: {
      int anRef[8];
      NameContext *p;
      int i;
      for(i=0, p=pNC; p && i<ArraySize(anRef); p=p->pNext, i++){
        anRef[i] = p->nRef;
      }
      sqlite3WalkExpr(pWalker, pExpr->pLeft);
      if( 0==sqlite3ExprCanBeNull(pExpr->pLeft) && !IN_RENAME_OBJECT ){
        if( pExpr->op==TK_NOTNULL ){
          pExpr->u.zToken = "true";
          ExprSetProperty(pExpr, EP_IsTrue);
        }else{
          pExpr->u.zToken = "false";
          ExprSetProperty(pExpr, EP_IsFalse);
        }

      if( is_agg ){
#ifndef SQLITE_OMIT_WINDOWFUNC
        if( pWin ){
          Select *pSel = pNC->pWinSelect;
          assert( pWin==pExpr->y.pWin );
          if( IN_RENAME_OBJECT==0 ){
            sqlite3WindowUpdate(pParse, pSel ? pSel->pWinDefn : 0, pWin, pDef);
            if( pParse->db->mallocFailed ) break;
          }
          sqlite3WalkExprList(pWalker, pWin->pPartition);
          sqlite3WalkExprList(pWalker, pWin->pOrderBy);
          sqlite3WalkExpr(pWalker, pWin->pFilter);
          sqlite3WindowLink(pSel, pWin);
          pNC->ncFlags |= NC_HasWin;
        }else

    }
    case TK_IS:
    case TK_ISNOT: {
      Expr *pRight = sqlite3ExprSkipCollateAndLikely(pExpr->pRight);
      assert( !ExprHasProperty(pExpr, EP_Reduced) );
      /* Handle special cases of "x IS TRUE", "x IS FALSE", "x IS NOT TRUE",
      ** and "x IS NOT FALSE". */
      if( ALWAYS(pRight) && (pRight->op==TK_ID || pRight->op==TK_TRUEFALSE) ){
        int rc = resolveExprStep(pWalker, pRight);
        if( rc==WRC_Abort ) return WRC_Abort;
        if( pRight->op==TK_TRUEFALSE ){
          pExpr->op2 = pExpr->op;
          pExpr->op = TK_TRUTH;
          return WRC_Continue;
        }

        if( rc==SQLITE_OK && pStep->pWhere ){
          rc = sqlite3ResolveExprNames(&sNC, pStep->pWhere);
        }
        if( rc==SQLITE_OK ){
          rc = sqlite3ResolveExprListNames(&sNC, pStep->pExprList);
        }
        assert( !pStep->pUpsert || (!pStep->pWhere && !pStep->pExprList) );
        if( pStep->pUpsert && rc==SQLITE_OK ){
          Upsert *pUpsert = pStep->pUpsert;

          pUpsert->pUpsertSrc = pSrc;
          sNC.uNC.pUpsert = pUpsert;
          sNC.ncFlags = NC_UUpsert;
          rc = sqlite3ResolveExprListNames(&sNC, pUpsert->pUpsertTarget);
          if( rc==SQLITE_OK ){
            ExprList *pUpsertSet = pUpsert->pUpsertSet;
            rc = sqlite3ResolveExprListNames(&sNC, pUpsertSet);

  char *zNew = 0;

#ifndef SQLITE_OMIT_AUTHORIZATION
  sqlite3_xauth xAuth = db->xAuth;
  db->xAuth = 0;
#endif

  UNUSED_PARAMETER(NotUsed);
  rc = renameParseSql(&sParse, zDb, db, zSql, iSchema==1);
  if( rc!=SQLITE_OK ) goto drop_column_done;
  pTab = sParse.pNewTable;
  if( pTab==0 || pTab->nCol==1 || iCol>=pTab->nCol ){
    /* This can happen if the sqlite_schema table is corrupt */
    rc = SQLITE_CORRUPT_BKPT;
    goto drop_column_done;
  }

  pCol = renameTokenFind(&sParse, 0, (void*)pTab->aCol[iCol].zName);
  if( iCol<pTab->nCol-1 ){

    return;
  }
  pParse->u1.pReturning = pRet;
  pRet->pParse = pParse;
  pRet->pReturnEL = pList;
  sqlite3ParserAddCleanup(pParse,
     (void(*)(sqlite3*,void*))sqlite3DeleteReturning, pRet);
  testcase( pParse->earlyCleanup );
  if( db->mallocFailed ) return;
  pRet->retTrig.zName = RETURNING_TRIGGER_NAME;
  pRet->retTrig.op = TK_RETURNING;
  pRet->retTrig.tr_tm = TRIGGER_AFTER;
  pRet->retTrig.bReturning = 1;
  pRet->retTrig.pSchema = db->aDb[1].pSchema;
  pRet->retTrig.step_list = &pRet->retTStep;

** Use this mechanism for uncommon cleanups.  There is a higher setup
** cost for this mechansim (an extra malloc), so it should not be used
** for common cleanups that happen on most calls.  But for less
** common cleanups, we save a single NULL-pointer comparison in
** sqlite3ParserReset(), which reduces the total CPU cycle count.
**
** If a memory allocation error occurs, then the cleanup happens immediately.
** When either SQLITE_DEBUG or SQLITE_COVERAGE_TEST are defined, the
** pParse->earlyCleanup flag is set in that case.  Calling code show verify
** that test cases exist for which this happens, to guard against possible
** use-after-free errors following an OOM.  The preferred way to do this is
** to immediately follow the call to this routine with:
**
**       testcase( pParse->earlyCleanup );
**
** This routine returns a copy of its pPtr input (the third parameter)
** except if an early cleanup occurs, in which case it returns NULL.  So
** another way to check for early cleanup is to check the return value.
** Or, stop using the pPtr parameter with this call and use only its
** return value thereafter.  Something like this:
**
**       pObj = sqlite3ParserAddCleanup(pParse, destructor, pObj);
*/
SQLITE_PRIVATE void *sqlite3ParserAddCleanup(
  Parse *pParse,                      /* Destroy when this Parser finishes */
  void (*xCleanup)(sqlite3*,void*),   /* The cleanup routine */
  void *pPtr                          /* Pointer to object to be cleaned up */
){
  ParseCleanup *pCleanup = sqlite3DbMallocRaw(pParse->db, sizeof(*pCleanup));

    sqlite3ExprListDelete(db, p->pEList);
    sqlite3SrcListDelete(db, p->pSrc);
    sqlite3ExprDelete(db, p->pWhere);
    sqlite3ExprListDelete(db, p->pGroupBy);
    sqlite3ExprDelete(db, p->pHaving);
    sqlite3ExprListDelete(db, p->pOrderBy);
    sqlite3ExprDelete(db, p->pLimit);
    if( OK_IF_ALWAYS_TRUE(p->pWith) ) sqlite3WithDelete(db, p->pWith);
#ifndef SQLITE_OMIT_WINDOWFUNC
    if( OK_IF_ALWAYS_TRUE(p->pWinDefn) ){
      sqlite3WindowListDelete(db, p->pWinDefn);
    }
    while( p->pWin ){
      assert( p->pWin->ppThis==&p->pWin );
      sqlite3WindowUnlinkFromSelect(p->pWin);
    }
#endif

    if( bFree ) sqlite3DbFreeNN(db, p);
    p = pPrior;
    bFree = 1;
  }
}

/*

  }
  return pInfo;
}

/*
** Name of the connection operator, used for error messages.
*/
SQLITE_PRIVATE const char *sqlite3SelectOpName(int id){
  char *z;
  switch( id ){
    case TK_ALL:       z = "UNION ALL";   break;
    case TK_INTERSECT: z = "INTERSECT";   break;
    case TK_EXCEPT:    z = "EXCEPT";      break;
    default:           z = "UNION";       break;
  }

  */
  assert( p && p->pPrior );  /* Calling function guarantees this much */
  assert( (p->selFlags & SF_Recursive)==0 || p->op==TK_ALL || p->op==TK_UNION );
  assert( p->selFlags & SF_Compound );
  db = pParse->db;
  pPrior = p->pPrior;
  dest = *pDest;
  assert( pPrior->pOrderBy==0 );

  assert( pPrior->pLimit==0 );




  v = sqlite3GetVdbe(pParse);
  assert( v!=0 );  /* The VDBE already created by calling function */

  /* Create the destination temporary table if necessary
  */
  if( dest.eDest==SRT_EphemTab ){

        int addr = 0;
        int nLimit;
        assert( !pPrior->pLimit );
        pPrior->iLimit = p->iLimit;
        pPrior->iOffset = p->iOffset;
        pPrior->pLimit = p->pLimit;
        rc = sqlite3Select(pParse, pPrior, &dest);
        pPrior->pLimit = 0;
        if( rc ){
          goto multi_select_end;
        }
        p->pPrior = 0;
        p->iLimit = pPrior->iLimit;
        p->iOffset = pPrior->iOffset;
        if( p->iLimit ){
          addr = sqlite3VdbeAddOp1(v, OP_IfNot, p->iLimit); VdbeCoverage(v);
          VdbeComment((v, "Jump ahead if LIMIT reached"));
          if( p->iOffset ){
            sqlite3VdbeAddOp3(v, OP_OffsetLimit,
                              p->iLimit, p->iOffset+1, p->iOffset);
          }
        }
        ExplainQueryPlan((pParse, 1, "UNION ALL"));
        rc = sqlite3Select(pParse, p, &dest);
        testcase( rc!=SQLITE_OK );
        pDelete = p->pPrior;
        p->pPrior = pPrior;
        p->nSelectRow = sqlite3LogEstAdd(p->nSelectRow, pPrior->nSelectRow);
        if( p->pLimit
         && sqlite3ExprIsInteger(p->pLimit->pLeft, &nLimit)
         && nLimit>0 && p->nSelectRow > sqlite3LogEst((u64)nLimit)
        ){
          p->nSelectRow = sqlite3LogEst((u64)nLimit);
        }
        if( addr ){
          sqlite3VdbeJumpHere(v, addr);
        }

          op = SRT_Union;
        }
        p->pPrior = 0;
        pLimit = p->pLimit;
        p->pLimit = 0;
        uniondest.eDest = op;
        ExplainQueryPlan((pParse, 1, "%s USING TEMP B-TREE",
                          sqlite3SelectOpName(p->op)));
        rc = sqlite3Select(pParse, p, &uniondest);
        testcase( rc!=SQLITE_OK );
        assert( p->pOrderBy==0 );
        pDelete = p->pPrior;
        p->pPrior = pPrior;
        p->pOrderBy = 0;
        if( p->op==TK_UNION ){

        assert( p->addrOpenEphm[1] == -1 );
        p->addrOpenEphm[1] = addr;
        p->pPrior = 0;
        pLimit = p->pLimit;
        p->pLimit = 0;
        intersectdest.iSDParm = tab2;
        ExplainQueryPlan((pParse, 1, "%s USING TEMP B-TREE",
                          sqlite3SelectOpName(p->op)));
        rc = sqlite3Select(pParse, p, &intersectdest);
        testcase( rc!=SQLITE_OK );
        pDelete = p->pPrior;
        p->pPrior = pPrior;
        if( p->nSelectRow>pPrior->nSelectRow ){
          p->nSelectRow = pPrior->nSelectRow;
        }

** size result sets.
*/
SQLITE_PRIVATE void sqlite3SelectWrongNumTermsError(Parse *pParse, Select *p){
  if( p->selFlags & SF_Values ){
    sqlite3ErrorMsg(pParse, "all VALUES must have the same number of terms");
  }else{
    sqlite3ErrorMsg(pParse, "SELECTs to the left and right of %s"
      " do not have the same number of result columns",
      sqlite3SelectOpName(p->op));
  }
}

/*
** Code an output subroutine for a coroutine implementation of a
** SELECT statment.
**

    /* If this is a scalar select that is part of an expression, then
    ** store the results in the appropriate memory cell and break out
    ** of the scan loop.  Note that the select might return multiple columns
    ** if it is the RHS of a row-value IN operator.
    */
    case SRT_Mem: {

      testcase( pIn->nSdst>1 );
      sqlite3ExprCodeMove(pParse, pIn->iSdst, pDest->iSDParm, pIn->nSdst);

      /* The LIMIT clause will jump out of the loop for us */
      break;
    }
#endif /* #ifndef SQLITE_OMIT_SUBQUERY */

    /* The results are stored in a sequence of registers
    ** starting at pDest->iSdst.  Then the co-routine yields.

  regAddrA = ++pParse->nMem;
  regAddrB = ++pParse->nMem;
  regOutA = ++pParse->nMem;
  regOutB = ++pParse->nMem;
  sqlite3SelectDestInit(&destA, SRT_Coroutine, regAddrA);
  sqlite3SelectDestInit(&destB, SRT_Coroutine, regAddrB);

  ExplainQueryPlan((pParse, 1, "MERGE (%s)", sqlite3SelectOpName(p->op)));

  /* Generate a coroutine to evaluate the SELECT statement to the
  ** left of the compound operator - the "A" select.
  */
  addrSelectA = sqlite3VdbeCurrentAddr(v) + 1;
  addr1 = sqlite3VdbeAddOp3(v, OP_InitCoroutine, regAddrA, 0, addrSelectA);
  VdbeComment((v, "left SELECT"));

      }
#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_VIRTUALTABLE)
      if( IsVirtual(pTab) || pTab->pSelect ){
        i16 nCol;
        u8 eCodeOrig = pWalker->eCode;
        if( sqlite3ViewGetColumnNames(pParse, pTab) ) return WRC_Abort;
        assert( pFrom->pSelect==0 );
        if( pTab->pSelect
         && (db->flags & SQLITE_EnableView)==0
         && pTab->pSchema!=db->aDb[1].pSchema
        ){
          sqlite3ErrorMsg(pParse, "access to view \"%s\" prohibited",
            pTab->zName);
        }
#ifndef SQLITE_OMIT_VIRTUALTABLE
        if( IsVirtual(pTab)
         && pFrom->fg.fromDDL
         && ALWAYS(pTab->pVTable!=0)

  assert( p->pOrderBy==0 || pDest->eDest!=SRT_DistQueue );
  assert( p->pOrderBy==0 || pDest->eDest!=SRT_Queue );
  if( IgnorableDistinct(pDest) ){
    assert(pDest->eDest==SRT_Exists     || pDest->eDest==SRT_Union ||
           pDest->eDest==SRT_Except     || pDest->eDest==SRT_Discard ||
           pDest->eDest==SRT_DistQueue  || pDest->eDest==SRT_DistFifo );
    /* All of these destinations are also able to ignore the ORDER BY clause */
    if( p->pOrderBy ){
#if SELECTTRACE_ENABLED
      SELECTTRACE(1,pParse,p, ("dropping superfluous ORDER BY:\n"));
      if( sqlite3SelectTrace & 0x100 ){
        sqlite3TreeViewExprList(0, p->pOrderBy, 0, "ORDERBY");
      }
#endif
      sqlite3ParserAddCleanup(pParse,
        (void(*)(sqlite3*,void*))sqlite3ExprListDelete,
        p->pOrderBy);
      testcase( pParse->earlyCleanup );
      p->pOrderBy = 0;
    }
    p->selFlags &= ~SF_Distinct;
    p->selFlags |= SF_NoopOrderBy;
  }
  sqlite3SelectPrep(pParse, p, 0);
  if( pParse->nErr || db->mallocFailed ){
    goto select_end;
  }

    ** sAggInfo for all TK_AGG_FUNCTION nodes in expressions of the
    ** SELECT statement.
    */
    pAggInfo = sqlite3DbMallocZero(db, sizeof(*pAggInfo) );
    if( pAggInfo ){
      sqlite3ParserAddCleanup(pParse,
          (void(*)(sqlite3*,void*))agginfoFree, pAggInfo);
      testcase( pParse->earlyCleanup );
    }
    if( db->mallocFailed ){
      goto select_end;
    }
    pAggInfo->selId = p->selId;
    memset(&sNC, 0, sizeof(sNC));
    sNC.pParse = pParse;

  Expr **ppAnd = 0;
  int idxNew;
  sqlite3 *db = pParse->db;

  assert( pExpr->op==TK_EXISTS );
  assert( (pExpr->flags & EP_VarSelect) && (pExpr->flags & EP_xIsSelect) );

  if( pSel->selFlags & SF_Aggregate ) return;
#ifndef SQLITE_OMIT_WINDOWFUNC
  if( pSel->pWin ) return;
#endif
  if( pSel->pPrior ) return;
  if( pSel->pWhere==0 ) return;
  if( 0==exprAnalyzeExistsFindEq(pSel, 0, 0) ) return;

  pDup = sqlite3ExprDup(db, pExpr, 0);
  if( db->mallocFailed ){
    sqlite3ExprDelete(db, pDup);

  Vdbe *v = sqlite3GetVdbe(pParse);
  ExprList *pOrderBy = p->pMWin->pOrderBy;  /* ORDER BY clause for window */
  int reg1 = sqlite3GetTempReg(pParse);     /* Reg. for csr1.peerVal+regVal */
  int reg2 = sqlite3GetTempReg(pParse);     /* Reg. for csr2.peerVal */
  int regString = ++pParse->nMem;           /* Reg. for constant value '' */
  int arith = OP_Add;                       /* OP_Add or OP_Subtract */
  int addrGe;                               /* Jump destination */
  CollSeq *pColl;

  assert( op==OP_Ge || op==OP_Gt || op==OP_Le );
  assert( pOrderBy && pOrderBy->nExpr==1 );
  if( pOrderBy->a[0].sortFlags & KEYINFO_ORDER_DESC ){
    switch( op ){
      case OP_Ge: op = OP_Le; break;
      case OP_Gt: op = OP_Lt; break;

    }
  }

  /* Compare registers reg2 and reg1, taking the jump if required. Note that
  ** control skips over this test if the BIGNULL flag is set and either
  ** reg1 or reg2 contain a NULL value.  */
  sqlite3VdbeAddOp3(v, op, reg2, lbl, reg1); VdbeCoverage(v);
  pColl = sqlite3ExprNNCollSeq(pParse, pOrderBy->a[0].pExpr);
  sqlite3VdbeAppendP4(v, (void*)pColl, P4_COLLSEQ);
  sqlite3VdbeChangeP5(v, SQLITE_NULLEQ);

  assert( op==OP_Ge || op==OP_Gt || op==OP_Lt || op==OP_Le );
  testcase(op==OP_Ge); VdbeCoverageIf(v, op==OP_Ge);
  testcase(op==OP_Lt); VdbeCoverageIf(v, op==OP_Lt);
  testcase(op==OP_Le); VdbeCoverageIf(v, op==OP_Le);
  testcase(op==OP_Gt); VdbeCoverageIf(v, op==OP_Gt);

  ** For a compound SELECT statement, make sure p->pPrior->pNext==p for
  ** all elements in the list.  And make sure list length does not exceed
  ** SQLITE_LIMIT_COMPOUND_SELECT.
  */
  static void parserDoubleLinkSelect(Parse *pParse, Select *p){
    assert( p!=0 );
    if( p->pPrior ){
      Select *pNext = 0, *pLoop = p;
      int mxSelect, cnt = 1;
      while(1){
        pLoop->pNext = pNext;
        pLoop->selFlags |= SF_Compound;
        pNext = pLoop;
        pLoop = pLoop->pPrior;
        if( pLoop==0 ) break;
        cnt++;
        if( pLoop->pOrderBy || pLoop->pLimit ){
          sqlite3ErrorMsg(pParse,"%s clause should come after %s not before",
             pLoop->pOrderBy!=0 ? "ORDER BY" : "LIMIT",
             sqlite3SelectOpName(pNext->op));
          break;
        }
      }
      if( (p->selFlags & SF_MultiValue)==0 &&
        (mxSelect = pParse->db->aLimit[SQLITE_LIMIT_COMPOUND_SELECT])>0 &&
        cnt>mxSelect
      ){
        sqlite3ErrorMsg(pParse, "too many terms in compound SELECT");
      }

  p2 = pOut = pPhrase->doclist.pList;
  res = fts3PoslistNearMerge(
    &pOut, aTmp, nParam1, nParam2, paPoslist, &p2
  );
  if( res ){
    nNew = (int)(pOut - pPhrase->doclist.pList) - 1;
    assert_fts3_nc( nNew<=pPhrase->doclist.nList && nNew>0 );
    if( nNew>=0 && nNew<=pPhrase->doclist.nList ){
      assert( pPhrase->doclist.pList[nNew]=='\0' );

      memset(&pPhrase->doclist.pList[nNew], 0, pPhrase->doclist.nList - nNew);
      pPhrase->doclist.nList = nNew;
    }
    *paPoslist = pPhrase->doclist.pList;
    *pnToken = pPhrase->nToken;
  }

    return getNextString(pParse, &zInput[1], ii-1, ppExpr);
  }

  if( sqlite3_fts3_enable_parentheses ){
    if( *zInput=='(' ){
      int nConsumed = 0;
      pParse->nNest++;
#if !defined(SQLITE_MAX_EXPR_DEPTH)
      if( pParse->nNest>1000 ) return SQLITE_ERROR;
#elif SQLITE_MAX_EXPR_DEPTH>0
      if( pParse->nNest>SQLITE_MAX_EXPR_DEPTH ) return SQLITE_ERROR;
#endif
      rc = fts3ExprParse(pParse, zInput+1, nInput-1, ppExpr, &nConsumed);
      *pnConsumed = (int)(zInput - z) + 1 + nConsumed;
      return rc;
    }else if( *zInput==')' ){
      pParse->nNest--;
      *pnConsumed = (int)((zInput - z) + 1);
      *ppExpr = 0;

        pNode = &pWriter->aNodeWriter[i];

        if( pNode->block.a){
          rc = nodeReaderInit(&reader, pNode->block.a, pNode->block.n);
          while( reader.aNode && rc==SQLITE_OK ) rc = nodeReaderNext(&reader);
          blobGrowBuffer(&pNode->key, reader.term.n, &rc);
          if( rc==SQLITE_OK ){
            assert_fts3_nc( reader.term.n>0 || reader.aNode==0 );
            if( reader.term.n>0 ){


              memcpy(pNode->key.a, reader.term.a, reader.term.n);
            }
            pNode->key.n = reader.term.n;
            if( i>0 ){
              char *aBlock = 0;
              int nBlock = 0;
              pNode = &pWriter->aNodeWriter[i-1];
              pNode->iBlock = reader.iChild;
              rc = sqlite3Fts3ReadBlock(p, reader.iChild, &aBlock, &nBlock,0);
              blobGrowBuffer(&pNode->block,
                  MAX(nBlock, p->nNodeSize)+FTS3_NODE_PADDING, &rc
                  );
              if( rc==SQLITE_OK ){
                memcpy(pNode->block.a, aBlock, nBlock);
                pNode->block.n = nBlock;
                memset(&pNode->block.a[nBlock], 0, FTS3_NODE_PADDING);
              }
              sqlite3_free(aBlock);

            }
          }
        }
        nodeReaderRelease(&reader);
      }
    }

      pIter->nPoslist = (nPos>>1);
    }else{
      pIter->nPoslist = ((int)(p[0])) >> 1;
      pIter->nSize = 1;
    }

    pIter->aPoslist = p;
    if( &pIter->aPoslist[pIter->nPoslist]>pIter->aEof ){
      pIter->aPoslist = 0;
    }
  }
}

static void fts5DoclistIterInit(
  Fts5Buffer *pBuf,
  Fts5DoclistIter *pIter
){

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: 2021-03-09 21:20:12 9645fe1a050e8b61aea1fba2f142819c387ecb043741392c5719bf7ad303bf8b", -1, SQLITE_TRANSIENT);
}

/*
** Return true if zName is the extension on one of the shadow tables used
** by this module.
*/
static int fts5ShadowName(const char *zName){

#endif
  return rc;
}
#endif /* SQLITE_CORE */
#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_STMTVTAB) */

/************** End of stmt.c ************************************************/
#if __LINE__!=234100
#undef SQLITE_SOURCE_ID
#define SQLITE_SOURCE_ID      "2021-03-09 21:20:12 9645fe1a050e8b61aea1fba2f142819c387ecb043741392c5719bf7ad303alt2"
#endif
/* Return the source-id for this library */
SQLITE_API const char *sqlite3_sourceid(void){ return SQLITE_SOURCE_ID; }
/************************** End of sqlite3.c ******************************/

**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.35.0"
#define SQLITE_VERSION_NUMBER 3035000
#define SQLITE_SOURCE_ID      "2021-03-09 21:20:12 9645fe1a050e8b61aea1fba2f142819c387ecb043741392c5719bf7ad303bf8b"

/*
** 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

** <dd> ^This option is used to enable or disable [CREATE VIEW | views].
** There should be two additional arguments.
** The first argument is an integer which is 0 to disable views,
** positive to enable views or negative to leave the setting unchanged.
** The second parameter is a pointer to an integer into which
** is written 0 or 1 to indicate whether views are disabled or enabled
** following this call.  The second parameter may be a NULL pointer, in
** which case the view setting is not reported back.
**
** <p>Originally this option disabled all views.  ^(However, since
** SQLite version 3.35.0, TEMP views are still allowed even if
** this option is off.  So, in other words, this option now only disables
** views in the main database schema or in the schemas of ATTACH-ed
** databases.)^ </dd>
**
** [[SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER]]
** <dt>SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER</dt>
** <dd> ^This option is used to enable or disable the
** [fts3_tokenizer()] function which is part of the
** [FTS3] full-text search engine extension.
** There should be two additional arguments.