SQLite

  const int nToOpen = 1;
#endif

  if( v==0 ) return;
  assert( sqlite3BtreeHoldsAllMutexes(db) );
  assert( sqlite3VdbeDb(v)==db );
  pDb = &db->aDb[iDb];


  /* Create new statistic tables if they do not exist, or clear them
  ** if they do already exist.
  */
  for(i=0; i<ArraySize(aTable); i++){
    const char *zTab = aTable[i].zName;
    Table *pStat;

#ifdef SQLITE_ENABLE_STAT4
  int doOnce = 1;              /* Flag for a one-time computation */
#endif
#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
  Table *pStat1 = 0;
#endif

  sqlite3TouchRegister(pParse, iMem);
  assert( sqlite3NoTempsInRange(pParse, regNewRowid, iMem) );
  v = sqlite3GetVdbe(pParse);
  if( v==0 || NEVER(pTab==0) ){
    return;
  }
  if( !IsOrdinaryTable(pTab) ){
    /* Do not gather statistics on views or virtual tables */
    return;

    **  end_of_scan:
    */

    /* Make sure there are enough memory cells allocated to accommodate 
    ** the regPrev array and a trailing rowid (the rowid slot is required
    ** when building a record to insert into the sample column of 
    ** the sqlite_stat4 table.  */
    sqlite3TouchRegister(pParse, regPrev+nColTest);

    /* Open a read-only cursor on the index being analyzed. */
    assert( iDb==sqlite3SchemaToIndex(db, pIdx->pSchema) );
    sqlite3VdbeAddOp3(v, OP_OpenRead, iIdxCur, pIdx->tnum, iDb);
    sqlite3VdbeSetP4KeyInfo(pParse, pIdx);
    VdbeComment((v, "%s", pIdx->zName));

          }else{
            nColX = pX->nColumn;
          }
          if( nColX>mxCol ) mxCol = nColX;
        }

        /* Allocate space to compute results for the largest index */
        sqlite3TouchRegister(pParse, regCol+mxCol);
        doOnce = 0;
#ifdef SQLITE_DEBUG
        /* Verify that the call to sqlite3ClearTempRegCache() below
        ** really is needed.

        ** https://sqlite.org/forum/forumpost/83cb4a95a0 (2023-03-25)
        */




        testcase( !sqlite3NoTempsInRange(pParse, regEq, regCol+mxCol) );


#endif
        sqlite3ClearTempRegCache(pParse);  /* tag-20230325-1 */
        assert( sqlite3NoTempsInRange(pParse, regEq, regCol+mxCol) );
      }
      assert( sqlite3NoTempsInRange(pParse, regEq, regCol+nCol) );

      addrNext = sqlite3VdbeCurrentAddr(v);
      callStatGet(pParse, regStat, STAT_GET_ROWID, regSampleRowid);
      addrIsNull = sqlite3VdbeAddOp1(v, OP_IsNull, regSampleRowid);
      VdbeCoverage(v);
      callStatGet(pParse, regStat, STAT_GET_NEQ, regEq);
      callStatGet(pParse, regStat, STAT_GET_NLT, regLt);

  openStatTable(pParse, iDb, iStatCur, 0, 0);
  iMem = pParse->nMem+1;
  iTab = pParse->nTab;
  assert( sqlite3SchemaMutexHeld(db, iDb, 0) );
  for(k=sqliteHashFirst(&pSchema->tblHash); k; k=sqliteHashNext(k)){
    Table *pTab = (Table*)sqliteHashData(k);
    analyzeOneTable(pParse, pTab, 0, iStatCur, iMem, iTab);
    iMem = sqlite3FirstAvailableRegister(pParse, iMem);
  }
  loadAnalysis(pParse, iDb);
}

/*
** Generate code that will do an analysis of a single table in
** a database.  If pOnlyIdx is not NULL then it is a single index

** the sub/co-routine does not use registers in common with the code that
** invokes the sub/co-routine.
*/
void sqlite3ClearTempRegCache(Parse *pParse){
  pParse->nTempReg = 0;
  pParse->nRangeReg = 0;
}

/*
** Make sure sufficient registers have been allocated so that
** iReg is a valid register number.
*/
void sqlite3TouchRegister(Parse *pParse, int iReg){
  if( pParse->nMem<iReg ) pParse->nMem = iReg;
}

/*
** Return the latest reusable register in the set of all registers.
** The value returned is no less than iMin.  If any register iMin or
** greater is in permanent use, then return one more than that last
** permanent register.
*/
int sqlite3FirstAvailableRegister(Parse *pParse, int iMin){
  const ExprList *pList = pParse->pConstExpr;
  if( pList ){
    int i;
    for(i=0; i<pList->nExpr; i++){
      if( pList->a[i].u.iConstExprReg>=iMin ){
        iMin = pList->a[i].u.iConstExprReg + 1;
      }
    }
  }
  pParse->nTempReg = 0;
  pParse->nRangeReg = 0;
  return iMin;
}

/*
** Validate that no temporary register falls within the range of
** iFirst..iLast, inclusive.  This routine is only call from within assert()
** statements.
*/
#ifdef SQLITE_DEBUG
int sqlite3NoTempsInRange(Parse *pParse, int iFirst, int iLast){
  int i;
  if( pParse->nRangeReg>0
   && pParse->iRangeReg+pParse->nRangeReg > iFirst
   && pParse->iRangeReg <= iLast
  ){
     return 0;
  }
  for(i=0; i<pParse->nTempReg; i++){
    if( pParse->aTempReg[i]>=iFirst && pParse->aTempReg[i]<=iLast ){
      return 0;
    }
  }
  if( pParse->pConstExpr ){
    ExprList *pList = pParse->pConstExpr;
    for(i=0; i<pList->nExpr; i++){
      int iReg = pList->a[i].u.iConstExprReg;
      if( iReg==0 ) continue;
      if( iReg>=iFirst && iReg<=iLast ) return 0;
    }
  }
  return 1;
}
#endif /* SQLITE_DEBUG */

        k = sqliteHashNext(k);
      }
      if( pTab==0 || !IsOrdinaryTable(pTab) || pTab->u.tab.pFKey==0 ) continue;
      iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
      zDb = db->aDb[iDb].zDbSName;
      sqlite3CodeVerifySchema(pParse, iDb);
      sqlite3TableLock(pParse, iDb, pTab->tnum, 0, pTab->zName);
      sqlite3TouchRegister(pParse, pTab->nCol+regRow);
      sqlite3OpenTable(pParse, 0, iDb, pTab, OP_OpenRead);
      sqlite3VdbeLoadString(v, regResult, pTab->zName);
      assert( IsOrdinaryTable(pTab) );
      for(i=1, pFK=pTab->u.tab.pFKey; pFK; i++, pFK=pFK->pNextFrom){
        pParent = sqlite3FindTable(db, pFK->zTo, zDb);
        if( pParent==0 ) continue;
        pIdx = 0;

        }
        addrOk = sqlite3VdbeMakeLabel(pParse);

        /* Generate code to read the child key values into registers
        ** regRow..regRow+n. If any of the child key values are NULL, this 
        ** row cannot cause an FK violation. Jump directly to addrOk in 
        ** this case. */
        sqlite3TouchRegister(pParse, regRow + pFK->nCol);
        for(j=0; j<pFK->nCol; j++){
          int iCol = aiCols ? aiCols[j] : pFK->aCol[j].iFrom;
          sqlite3ExprCodeGetColumnOfTable(v, pTab, 0, iCol, regRow+j);
          sqlite3VdbeAddOp2(v, OP_IsNull, regRow+j, addrOk); VdbeCoverage(v);
        }

        /* Generate code to query the parent index for a matching parent

        for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
          aRoot[++cnt] = pIdx->tnum;
        }
      }
      aRoot[0] = cnt;

      /* Make sure sufficient number of registers have been allocated */
      sqlite3TouchRegister(pParse, 8+mxIdx);
      sqlite3ClearTempRegCache(pParse);

      /* Do the b-tree integrity checks */
      sqlite3VdbeAddOp4(v, OP_IntegrityCk, 2, cnt, 1, (char*)aRoot,P4_INTARRAY);
      sqlite3VdbeChangeP5(v, (u8)i);
      addr = sqlite3VdbeAddOp1(v, OP_IsNull, 2); VdbeCoverage(v);
      sqlite3VdbeAddOp4(v, OP_String8, 0, 3, 0,

int sqlite3RunParser(Parse*, const char*);
void sqlite3FinishCoding(Parse*);
int sqlite3GetTempReg(Parse*);
void sqlite3ReleaseTempReg(Parse*,int);
int sqlite3GetTempRange(Parse*,int);
void sqlite3ReleaseTempRange(Parse*,int,int);
void sqlite3ClearTempRegCache(Parse*);
void sqlite3TouchRegister(Parse*,int);
int sqlite3FirstAvailableRegister(Parse*,int);
#ifdef SQLITE_DEBUG
int sqlite3NoTempsInRange(Parse*,int,int);
#endif
Expr *sqlite3ExprAlloc(sqlite3*,int,const Token*,int);
Expr *sqlite3Expr(sqlite3*,int,const char*);
void sqlite3ExprAttachSubtrees(sqlite3*,Expr*,Expr*,Expr*);
Expr *sqlite3PExpr(Parse*, int, Expr*, Expr*);