DateTime *p
){
  double r;
  if( parseYyyyMmDd(zDate,p)==0 ){
    return 0;
  }else if( parseHhMmSs(zDate, p)==0 ){
    return 0;
  }else if( sqlite3StrICmp(zDate,"now")==0 ){
    sqlite3VdbePureFuncOnly(context);
    return setDateTimeToCurrent(context, p);
  }else if( sqlite3AtoF(zDate, &r, sqlite3Strlen30(zDate), SQLITE_UTF8) ){
    setRawDateNumber(p, r);
    return 0;
  }
  return 1;
}
................................................................................
#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 ){
        sqlite3VdbePureFuncOnly(pCtx);
        computeJD(p);
        p->iJD += localtimeOffset(p, pCtx, &rc);
        clearYMD_HMS_TZ(p);
      }
      break;
    }
#endif
................................................................................
          p->iJD = (sqlite3_int64)r;
          p->validJD = 1;
          p->rawS = 0;
          rc = 0;
        }
      }
#ifndef SQLITE_OMIT_LOCALTIME
      else if( sqlite3_stricmp(z, "utc")==0 ){
        sqlite3VdbePureFuncOnly(pCtx);
        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);

  DateTime *p
){
  double r;
  if( parseYyyyMmDd(zDate,p)==0 ){
    return 0;
  }else if( parseHhMmSs(zDate, p)==0 ){
    return 0;
  }else if( sqlite3StrICmp(zDate,"now")==0 && sqlite3NotPureFunc(context) ){

    return setDateTimeToCurrent(context, p);
  }else if( sqlite3AtoF(zDate, &r, sqlite3Strlen30(zDate), SQLITE_UTF8) ){
    setRawDateNumber(p, r);
    return 0;
  }
  return 1;
}
................................................................................
#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 && sqlite3NotPureFunc(pCtx) ){

        computeJD(p);
        p->iJD += localtimeOffset(p, pCtx, &rc);
        clearYMD_HMS_TZ(p);
      }
      break;
    }
#endif
................................................................................
          p->iJD = (sqlite3_int64)r;
          p->validJD = 1;
          p->rawS = 0;
          rc = 0;
        }
      }
#ifndef SQLITE_OMIT_LOCALTIME
      else if( sqlite3_stricmp(z, "utc")==0 && sqlite3NotPureFunc(pCtx) ){

        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);

        return target;
      }
      /* Otherwise, fall thru into the TK_COLUMN case */
    }
    case TK_COLUMN: {
      int iTab = pExpr->iTable;
      if( iTab<0 ){
        if( pParse->ckBase>0 ){
          /* Generating CHECK constraints or inserting into partial index */
          return pExpr->iColumn + pParse->ckBase;
        }else{
          /* Coding an expression that is part of an index where column names
          ** in the index refer to the table to which the index belongs */
          iTab = pParse->iSelfTab - 1;
        }
      }
      return sqlite3ExprCodeGetColumn(pParse, pExpr->pTab,

        return target;
      }
      /* Otherwise, fall thru into the TK_COLUMN case */
    }
    case TK_COLUMN: {
      int iTab = pExpr->iTable;
      if( iTab<0 ){
        if( pParse->iSelfTab<0 ){
          /* Generating CHECK constraints or inserting into partial index */
          return pExpr->iColumn - pParse->iSelfTab;
        }else{
          /* Coding an expression that is part of an index where column names
          ** in the index refer to the table to which the index belongs */
          iTab = pParse->iSelfTab - 1;
        }
      }
      return sqlite3ExprCodeGetColumn(pParse, pExpr->pTab,

  }

  /* Test all CHECK constraints
  */
#ifndef SQLITE_OMIT_CHECK
  if( pTab->pCheck && (db->flags & SQLITE_IgnoreChecks)==0 ){
    ExprList *pCheck = pTab->pCheck;
    pParse->ckBase = regNewData+1;
    onError = overrideError!=OE_Default ? overrideError : OE_Abort;
    for(i=0; i<pCheck->nExpr; i++){
      int allOk;
      Expr *pExpr = pCheck->a[i].pExpr;
      if( aiChng && checkConstraintUnchanged(pExpr, aiChng, pkChng) ) continue;
      allOk = sqlite3VdbeMakeLabel(v);
      sqlite3ExprIfTrue(pParse, pExpr, allOk, SQLITE_JUMPIFNULL);
................................................................................
        if( onError==OE_Replace ) onError = OE_Abort; /* IMP: R-15569-63625 */
        sqlite3HaltConstraint(pParse, SQLITE_CONSTRAINT_CHECK,
                              onError, zName, P4_TRANSIENT,
                              P5_ConstraintCheck);
      }
      sqlite3VdbeResolveLabel(v, allOk);
    }

  }
#endif /* !defined(SQLITE_OMIT_CHECK) */

  /* If rowid is changing, make sure the new rowid does not previously
  ** exist in the table.
  */
  if( pkChng && pPk==0 ){
................................................................................
    }
    iThisCur = iIdxCur+ix;
    addrUniqueOk = sqlite3VdbeMakeLabel(v);

    /* Skip partial indices for which the WHERE clause is not true */
    if( pIdx->pPartIdxWhere ){
      sqlite3VdbeAddOp2(v, OP_Null, 0, aRegIdx[ix]);
      pParse->ckBase = regNewData+1;
      sqlite3ExprIfFalseDup(pParse, pIdx->pPartIdxWhere, addrUniqueOk,
                            SQLITE_JUMPIFNULL);
      pParse->ckBase = 0;
    }

    /* Create a record for this index entry as it should appear after
    ** the insert or update.  Store that record in the aRegIdx[ix] register
    */
    regIdx = aRegIdx[ix]+1;
    for(i=0; i<pIdx->nColumn; i++){
      int iField = pIdx->aiColumn[i];
      int x;
      if( iField==XN_EXPR ){
        pParse->ckBase = regNewData+1;
        sqlite3ExprCodeCopy(pParse, pIdx->aColExpr->a[i].pExpr, regIdx+i);
        pParse->ckBase = 0;
        VdbeComment((v, "%s column %d", pIdx->zName, i));
      }else{
        if( iField==XN_ROWID || iField==pTab->iPKey ){
          x = regNewData;
        }else{
          x = iField + regNewData + 1;
        }

  }

  /* Test all CHECK constraints
  */
#ifndef SQLITE_OMIT_CHECK
  if( pTab->pCheck && (db->flags & SQLITE_IgnoreChecks)==0 ){
    ExprList *pCheck = pTab->pCheck;
    pParse->iSelfTab = -(regNewData+1);
    onError = overrideError!=OE_Default ? overrideError : OE_Abort;
    for(i=0; i<pCheck->nExpr; i++){
      int allOk;
      Expr *pExpr = pCheck->a[i].pExpr;
      if( aiChng && checkConstraintUnchanged(pExpr, aiChng, pkChng) ) continue;
      allOk = sqlite3VdbeMakeLabel(v);
      sqlite3ExprIfTrue(pParse, pExpr, allOk, SQLITE_JUMPIFNULL);
................................................................................
        if( onError==OE_Replace ) onError = OE_Abort; /* IMP: R-15569-63625 */
        sqlite3HaltConstraint(pParse, SQLITE_CONSTRAINT_CHECK,
                              onError, zName, P4_TRANSIENT,
                              P5_ConstraintCheck);
      }
      sqlite3VdbeResolveLabel(v, allOk);
    }
    pParse->iSelfTab = 0;
  }
#endif /* !defined(SQLITE_OMIT_CHECK) */

  /* If rowid is changing, make sure the new rowid does not previously
  ** exist in the table.
  */
  if( pkChng && pPk==0 ){
................................................................................
    }
    iThisCur = iIdxCur+ix;
    addrUniqueOk = sqlite3VdbeMakeLabel(v);

    /* Skip partial indices for which the WHERE clause is not true */
    if( pIdx->pPartIdxWhere ){
      sqlite3VdbeAddOp2(v, OP_Null, 0, aRegIdx[ix]);
      pParse->iSelfTab = -(regNewData+1);
      sqlite3ExprIfFalseDup(pParse, pIdx->pPartIdxWhere, addrUniqueOk,
                            SQLITE_JUMPIFNULL);
      pParse->iSelfTab = 0;
    }

    /* Create a record for this index entry as it should appear after
    ** the insert or update.  Store that record in the aRegIdx[ix] register
    */
    regIdx = aRegIdx[ix]+1;
    for(i=0; i<pIdx->nColumn; i++){
      int iField = pIdx->aiColumn[i];
      int x;
      if( iField==XN_EXPR ){
        pParse->iSelfTab = -(regNewData+1);
        sqlite3ExprCodeCopy(pParse, pIdx->aColExpr->a[i].pExpr, regIdx+i);
        pParse->iSelfTab = 0;
        VdbeComment((v, "%s column %d", pIdx->zName, i));
      }else{
        if( iField==XN_ROWID || iField==pTab->iPKey ){
          x = regNewData;
        }else{
          x = iField + regNewData + 1;
        }

        if( pTab->pCheck && (db->flags & SQLITE_IgnoreChecks)==0 ){
          ExprList *pCheck = sqlite3ExprListDup(db, pTab->pCheck, 0);
          if( db->mallocFailed==0 ){
            int addrCkFault = sqlite3VdbeMakeLabel(v);
            int addrCkOk = sqlite3VdbeMakeLabel(v);
            char *zErr;
            int k;
            pParse->iSelfTab = iDataCur+1;
            sqlite3ExprCachePush(pParse);
            for(k=pCheck->nExpr-1; k>0; k--){
              sqlite3ExprIfFalse(pParse, pCheck->a[k].pExpr, addrCkFault, 0);
            }
            sqlite3ExprIfTrue(pParse, pCheck->a[0].pExpr, addrCkOk, 
                SQLITE_JUMPIFNULL);
            sqlite3VdbeResolveLabel(v, addrCkFault);

        if( pTab->pCheck && (db->flags & SQLITE_IgnoreChecks)==0 ){
          ExprList *pCheck = sqlite3ExprListDup(db, pTab->pCheck, 0);
          if( db->mallocFailed==0 ){
            int addrCkFault = sqlite3VdbeMakeLabel(v);
            int addrCkOk = sqlite3VdbeMakeLabel(v);
            char *zErr;
            int k;
            pParse->iSelfTab = iDataCur + 1;
            sqlite3ExprCachePush(pParse);
            for(k=pCheck->nExpr-1; k>0; k--){
              sqlite3ExprIfFalse(pParse, pCheck->a[k].pExpr, addrCkFault, 0);
            }
            sqlite3ExprIfTrue(pParse, pCheck->a[0].pExpr, addrCkOk, 
                SQLITE_JUMPIFNULL);
            sqlite3VdbeResolveLabel(v, addrCkFault);

  find_home_dir(1);
#if !SQLITE_SHELL_IS_UTF8
  for(i=0; i<argc; i++) sqlite3_free(argv[i]);
  sqlite3_free(argv);
#endif
  return rc;
}

  find_home_dir(1);
#if !SQLITE_SHELL_IS_UTF8
  for(i=0; i<argc; i++) sqlite3_free(argv[i]);
  sqlite3_free(argv);
#endif
  return rc;
}

  int nRangeReg;       /* Size of the temporary register block */
  int iRangeReg;       /* First register in temporary register block */
  int nErr;            /* Number of errors seen */
  int nTab;            /* Number of previously allocated VDBE cursors */
  int nMem;            /* Number of memory cells used so far */
  int nOpAlloc;        /* Number of slots allocated for Vdbe.aOp[] */
  int szOpAlloc;       /* Bytes of memory space allocated for Vdbe.aOp[] */
  int ckBase;          /* Base register of data during check constraints */
  int iSelfTab;        /* Table of an index whose exprs are being coded */
  int iCacheLevel;     /* ColCache valid when aColCache[].iLevel<=iCacheLevel */
  int iCacheCnt;       /* Counter used to generate aColCache[].lru values */
  int nLabel;          /* Number of labels used */
  int *aLabel;         /* Space to hold the labels */
  ExprList *pConstExpr;/* Constant expressions */
  Token constraintName;/* Name of the constraint currently being parsed */
  yDbMask writeMask;   /* Start a write transaction on these databases */

  int nRangeReg;       /* Size of the temporary register block */
  int iRangeReg;       /* First register in temporary register block */
  int nErr;            /* Number of errors seen */
  int nTab;            /* Number of previously allocated VDBE cursors */
  int nMem;            /* Number of memory cells used so far */
  int nOpAlloc;        /* Number of slots allocated for Vdbe.aOp[] */
  int szOpAlloc;       /* Bytes of memory space allocated for Vdbe.aOp[] */
  int iSelfTab;        /* Table for associated with an index on expr, or negative
                       ** of the base register during check-constraint eval */
  int iCacheLevel;     /* ColCache valid when aColCache[].iLevel<=iCacheLevel */
  int iCacheCnt;       /* Counter used to generate aColCache[].lru values */
  int nLabel;          /* Number of labels used */
  int *aLabel;         /* Space to hold the labels */
  ExprList *pConstExpr;/* Constant expressions */
  Token constraintName;/* Name of the constraint currently being parsed */
  yDbMask writeMask;   /* Start a write transaction on these databases */

typedef int (*RecordCompare)(int,const void*,UnpackedRecord*);
RecordCompare sqlite3VdbeFindCompare(UnpackedRecord*);

#ifndef SQLITE_OMIT_TRIGGER
void sqlite3VdbeLinkSubProgram(Vdbe *, SubProgram *);
#endif

void sqlite3VdbePureFuncOnly(sqlite3_context*);

/* Use SQLITE_ENABLE_COMMENTS to enable generation of extra comments on
** each VDBE opcode.
**
** Use the SQLITE_ENABLE_MODULE_COMMENTS macro to see some extra no-op
** comments in VDBE programs that show key decision points in the code
** generator.

typedef int (*RecordCompare)(int,const void*,UnpackedRecord*);
RecordCompare sqlite3VdbeFindCompare(UnpackedRecord*);

#ifndef SQLITE_OMIT_TRIGGER
void sqlite3VdbeLinkSubProgram(Vdbe *, SubProgram *);
#endif

int sqlite3NotPureFunc(sqlite3_context*);

/* Use SQLITE_ENABLE_COMMENTS to enable generation of extra comments on
** each VDBE opcode.
**
** Use the SQLITE_ENABLE_MODULE_COMMENTS macro to see some extra no-op
** comments in VDBE programs that show key decision points in the code
** generator.

** rather than OP_Function.
**
** OP_PureFunc means that the function must be deterministic, and should
** throw an error if it is given inputs that would make it non-deterministic.
** This routine is invoked by date/time functions that use non-deterministic
** features such as 'now'.
*/
void sqlite3VdbePureFuncOnly(sqlite3_context *pCtx){
  if( pCtx->pVdbe->aOp[pCtx->iOp].opcode==OP_PureFunc ){
    sqlite3_result_error(pCtx, 
       "non-deterministic functions prohibited in index expressions", -1);


  }

}

#ifndef SQLITE_OMIT_VIRTUALTABLE
/*
** Transfer error message text from an sqlite3_vtab.zErrMsg (text stored
** in memory obtained from sqlite3_malloc) into a Vdbe.zErrMsg (text stored
** in memory obtained from sqlite3DbMalloc).

** rather than OP_Function.
**
** OP_PureFunc means that the function must be deterministic, and should
** throw an error if it is given inputs that would make it non-deterministic.
** This routine is invoked by date/time functions that use non-deterministic
** features such as 'now'.
*/
int sqlite3NotPureFunc(sqlite3_context *pCtx){
  if( pCtx->pVdbe->aOp[pCtx->iOp].opcode==OP_PureFunc ){
    sqlite3_result_error(pCtx, 
       "non-deterministic function in index expression or CHECK constraint",
       -1);
    return 0;
  }
  return 1;
}

#ifndef SQLITE_OMIT_VIRTUALTABLE
/*
** Transfer error message text from an sqlite3_vtab.zErrMsg (text stored
** in memory obtained from sqlite3_malloc) into a Vdbe.zErrMsg (text stored
** in memory obtained from sqlite3DbMalloc).

# 2017-07-20
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is testing date and time functions used in
# check constraints and index expressions.
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Skip this whole file if date and time functions are omitted
# at compile-time
#
ifcapable {!datetime} {
  finish_test
  return
}

do_execsql_test date2-100 {
  CREATE TABLE t1(x, y, CHECK( date(x) BETWEEN '2017-07-01' AND '2017-07-31' ));
  INSERT INTO t1(x,y) VALUES('2017-07-20','one');
} {}
do_catchsql_test date2-110 {
  INSERT INTO t1(x,y) VALUES('now','two');
} {1 {non-deterministic function in index expression or CHECK constraint}}
do_execsql_test date2-120 {
  SELECT * FROM t1;
} {2017-07-20 one}
do_catchsql_test date2-130 {
  INSERT INTO t1(x,y) VALUES('2017-08-01','two');
} {1 {CHECK constraint failed: t1}}

do_execsql_test date2-200 {
  CREATE TABLE t2(x,y);
  INSERT INTO t2(x,y) VALUES(1, '2017-07-20'), (2, 'xyzzy');
  CREATE INDEX t2y ON t2(date(y));
}
do_catchsql_test date2-210 {
  INSERT INTO t2(x,y) VALUES(3, 'now');
} {1 {non-deterministic function in index expression or CHECK constraint}}
do_execsql_test date2-220 {
  SELECT x, y FROM t2 ORDER BY x;
} {1 2017-07-20 2 xyzzy}

finish_test

do_catchsql_test indexexpr1-300 {
  CREATE TABLE t2(a,b,c); INSERT INTO t2 VALUES(1,2,3);
  CREATE INDEX t2x1 ON t2(a,b+random());
} {1 {non-deterministic functions prohibited in index expressions}}
do_catchsql_test indexexpr1-301 {
  CREATE INDEX t2x1 ON t2(julianday('now',a));
} {1 {non-deterministic function}}
do_catchsql_test indexexpr1-310 {
  CREATE INDEX t2x2 ON t2(a,b+(SELECT 15));
} {1 {subqueries prohibited in index expressions}}
do_catchsql_test indexexpr1-320 {
  CREATE TABLE e1(x,y,UNIQUE(y,substr(x,1,5)));
} {1 {expressions prohibited in PRIMARY KEY and UNIQUE constraints}}
do_catchsql_test indexexpr1-330 {

do_catchsql_test indexexpr1-300 {
  CREATE TABLE t2(a,b,c); INSERT INTO t2 VALUES(1,2,3);
  CREATE INDEX t2x1 ON t2(a,b+random());
} {1 {non-deterministic functions prohibited in index expressions}}
do_catchsql_test indexexpr1-301 {
  CREATE INDEX t2x1 ON t2(julianday('now',a));
} {1 {non-deterministic function in index expression or CHECK constraint}}
do_catchsql_test indexexpr1-310 {
  CREATE INDEX t2x2 ON t2(a,b+(SELECT 15));
} {1 {subqueries prohibited in index expressions}}
do_catchsql_test indexexpr1-320 {
  CREATE TABLE e1(x,y,UNIQUE(y,substr(x,1,5)));
} {1 {expressions prohibited in PRIMARY KEY and UNIQUE constraints}}
do_catchsql_test indexexpr1-330 {