SQLite

  sqlite3_value **argv
){
  int i;
  int inStr = 0;
  char *z;
  JsonString *pStr;
  pStr = (JsonString*)sqlite3_aggregate_context(ctx, 0);
  /* pStr is always non-NULL since jsonArrayStep() or jsonObjectStep() will
  ** always have been called to initalize it */
  if( NEVER(!pStr) ) return;
  if( !pStr ) return;
  z = pStr->zBuf;
  for(i=1; z[i]!=',' || inStr; i++){
    assert( i<pStr->nUsed );
    if( z[i]=='"' ){
      inStr = !inStr;
    }else if( z[i]=='\\' ){
      i++;

static void sumInverse(sqlite3_context *context, int argc, sqlite3_value**argv){
  SumCtx *p;
  int type;
  assert( argc==1 );
  UNUSED_PARAMETER(argc);
  p = sqlite3_aggregate_context(context, sizeof(*p));
  type = sqlite3_value_numeric_type(argv[0]);
  /* p is always non-NULL because sumStep() will have been called first
  ** to initialize it */
  if( ALWAYS(p) && type!=SQLITE_NULL ){
  if( p && type!=SQLITE_NULL ){
    p->cnt--;
    if( type==SQLITE_INTEGER ){
      i64 v = sqlite3_value_int64(argv[0]);
      p->rSum -= v;
      if( (p->approx|p->overflow)==0 && sqlite3AddInt64(&p->iSum, -1*v) ){
        p->overflow = 1;
      }

  p = sqlite3_aggregate_context(context, 0);
  sqlite3_result_int64(context, p ? p->n : 0);
}
#ifndef SQLITE_OMIT_WINDOWFUNC
static void countInverse(sqlite3_context *ctx, int argc, sqlite3_value **argv){
  CountCtx *p;
  p = sqlite3_aggregate_context(ctx, sizeof(*p));
  /* p is always non-NULL since countStep() will have been called first */
  if( (argc==0 || SQLITE_NULL!=sqlite3_value_type(argv[0])) && ALWAYS(p) ){
  if( (argc==0 || SQLITE_NULL!=sqlite3_value_type(argv[0])) && p ){
    p->n--;
#ifdef SQLITE_DEBUG
    p->bInverse = 1;
#endif
  }
}   
#else

  sqlite3_value **argv
){
  int n;
  assert( argc==1 || argc==2 );
  StrAccum *pAccum;
  if( sqlite3_value_type(argv[0])==SQLITE_NULL ) return;
  pAccum = (StrAccum*)sqlite3_aggregate_context(context, sizeof(*pAccum));
  /* pAccum is always non-NULL since groupConcatStep() will have always
  ** run frist to initialize it */
  if( ALWAYS(pAccum) ){
  if( pAccum ){
    n = sqlite3_value_bytes(argv[0]);
    if( argc==2 ){
      n += sqlite3_value_bytes(argv[1]);
    }else{
      n++;
    }
    if( n>=pAccum->nChar ){

  over_opt(Z)
%endif
. {
  if( Y && Y->nExpr>pParse->db->aLimit[SQLITE_LIMIT_FUNCTION_ARG] ){
    sqlite3ErrorMsg(pParse, "too many arguments on function %T", &X);
  }
  A = sqlite3ExprFunction(pParse, Y, &X);
  sqlite3WindowAttach(pParse, A, Z);
  if( D==SF_Distinct && A ){
    A->flags |= EP_Distinct;
  }
  sqlite3WindowAttach(pParse, A, Z);
}
expr(A) ::= id(X) LP STAR RP
%ifndef SQLITE_OMIT_WINDOWFUNC
  over_opt(Z)
%endif
. {
  A = sqlite3ExprFunction(pParse, 0, &X);

%type filter_opt {Expr*}
%destructor filter_opt {sqlite3ExprDelete(pParse->db, $$);}

%type range_or_rows {int}

%type frame_bound {struct FrameBound}
%destructor frame_bound {sqlite3ExprDelete(pParse->db, $$.pExpr);}
%type frame_bound_s {struct FrameBound}
%destructor frame_bound_s {sqlite3ExprDelete(pParse->db, $$.pExpr);}
%type frame_bound_e {struct FrameBound}
%destructor frame_bound_e {sqlite3ExprDelete(pParse->db, $$.pExpr);}

window_or_nm(A) ::= window(Z). {A = Z;}
window_or_nm(A) ::= nm(Z). {
  A = (Window*)sqlite3DbMallocZero(pParse->db, sizeof(Window));
  if( A ){
    A->zName = sqlite3DbStrNDup(pParse->db, Z.z, Z.n);
  }

part_opt(A) ::= PARTITION BY exprlist(X). { A = X; }
part_opt(A) ::= .                         { A = 0; }

frame_opt(A) ::= .                             { 
  A = sqlite3WindowAlloc(pParse, TK_RANGE, TK_UNBOUNDED, 0, TK_CURRENT, 0);
}
frame_opt(A) ::= range_or_rows(X) frame_bound_s(Y). { 
frame_opt(A) ::= range_or_rows(X) frame_bound(Y). { 
  A = sqlite3WindowAlloc(pParse, X, Y.eType, Y.pExpr, TK_CURRENT, 0);
}
frame_opt(A) ::= range_or_rows(X) BETWEEN frame_bound_s(Y) AND frame_bound_e(Z). { 
frame_opt(A) ::= range_or_rows(X) BETWEEN frame_bound(Y) AND frame_bound(Z). { 
  A = sqlite3WindowAlloc(pParse, X, Y.eType, Y.pExpr, Z.eType, Z.pExpr);
}

range_or_rows(A) ::= RANGE.   { A = TK_RANGE; }
range_or_rows(A) ::= ROWS.    { A = TK_ROWS;  }


frame_bound_s(A) ::= frame_bound(X). { A = X; }
frame_bound_s(A) ::= UNBOUNDED PRECEDING. {A.eType = TK_UNBOUNDED; A.pExpr = 0;}
frame_bound(A) ::= UNBOUNDED PRECEDING. { A.eType = TK_UNBOUNDED; A.pExpr = 0; }
frame_bound_e(A) ::= frame_bound(X). { A = X; }
frame_bound_e(A) ::= UNBOUNDED FOLLOWING. {A.eType = TK_UNBOUNDED; A.pExpr = 0;}

frame_bound(A) ::= expr(X) PRECEDING.   { A.eType = TK_PRECEDING; A.pExpr = X; }
frame_bound(A) ::= CURRENT ROW.         { A.eType = TK_CURRENT  ; A.pExpr = 0; }
frame_bound(A) ::= expr(X) FOLLOWING.   { A.eType = TK_FOLLOWING; A.pExpr = X; }
frame_bound(A) ::= UNBOUNDED FOLLOWING. { A.eType = TK_UNBOUNDED; A.pExpr = 0; }

%type windowdefn_opt {Window*}
%destructor windowdefn_opt {sqlite3WindowDelete(pParse->db, $$);}
windowdefn_opt(A) ::= . { A = 0; }
windowdefn_opt(A) ::= WINDOW windowdefn_list(B). { A = B; }

%type over_opt {Window*}

      }
      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_AggStep, 0, regAgg, pF->iMem);
    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);

  int cnt;
  u16 nullFlag;
  pOut = out2Prerelease(p, pOp);
  cnt = pOp->p3-pOp->p2;
  assert( pOp->p3<=(p->nMem+1 - p->nCursor) );
  pOut->flags = nullFlag = pOp->p1 ? (MEM_Null|MEM_Cleared) : MEM_Null;
  pOut->n = 0;
#ifdef SQLITE_DEBUG
  pOut->uTemp = 0;
#endif
  while( cnt>0 ){
    pOut++;
    memAboutToChange(p, pOut);
    sqlite3VdbeMemSetNull(pOut);
    pOut->flags = nullFlag;
    pOut->n = 0;
    cnt--;

  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: AggStep * P2 P3 P4 P5
/* Opcode: AggStep0 P1 P2 P3 P4 P5
** Synopsis: accum=r[P3] step(r[P2@P5])
**
** Execute the xStep function for an aggregate.
** The function has P5 arguments.  P4 is a pointer to the 
** Execute the xStep (if P1==0) or xInverse (if P1!=0) function for an
** aggregate.  The function has P5 arguments.  P4 is a pointer to the 
** FuncDef structure that specifies the function.  Register P3 is the
** accumulator.
**
** The P5 arguments are taken from register P2 and its
** successors.
*/
/* Opcode: AggInverse * P2 P3 P4 P5
** Synopsis: accum=r[P3] inverse(r[P2@P5])
**
** Execute the xInverse function for an aggregate.
** The function has P5 arguments.  P4 is a pointer to the 
** FuncDef structure that specifies the function.  Register P3 is the
** accumulator.
**
** The P5 arguments are taken from register P2 and its
** successors.
*/
/* Opcode: AggStep1 P1 P2 P3 P4 P5
/* Opcode: AggStep P1 P2 P3 P4 P5
** Synopsis: accum=r[P3] step(r[P2@P5])
**
** Execute the xStep (if P1==0) or xInverse (if P1!=0) function for an
** aggregate.  The function has P5 arguments.  P4 is a pointer to the 
** FuncDef structure that specifies the function.  Register P3 is the
** accumulator.
**
** The P5 arguments are taken from register P2 and its
** successors.
**
** This opcode is initially coded as OP_AggStep0.  On first evaluation,
** the FuncDef stored in P4 is converted into an sqlite3_context and
** the opcode is changed.  In this way, the initialization of the
** sqlite3_context only happens once, instead of on each call to the
** step function.
*/
case OP_AggInverse:
case OP_AggStep: {
case OP_AggStep0: {
  int n;
  sqlite3_context *pCtx;

  assert( pOp->p4type==P4_FUNCDEF );
  n = pOp->p5;
  assert( pOp->p3>0 && pOp->p3<=(p->nMem+1 - p->nCursor) );
  assert( n==0 || (pOp->p2>0 && pOp->p2+n<=(p->nMem+1 - p->nCursor)+1) );

  pCtx->iOp = (int)(pOp - aOp);
  pCtx->pVdbe = p;
  pCtx->skipFlag = 0;
  pCtx->isError = 0;
  pCtx->argc = n;
  pOp->p4type = P4_FUNCCTX;
  pOp->p4.pCtx = pCtx;

  /* OP_AggInverse must have P1==1 and OP_AggStep must have P1==0 */
  assert( pOp->p1==(pOp->opcode==OP_AggInverse) );

  pOp->opcode = OP_AggStep1;
  pOp->opcode = OP_AggStep;
  /* Fall through into OP_AggStep */
}
case OP_AggStep1: {
case OP_AggStep: {
  int i;
  sqlite3_context *pCtx;
  Mem *pMem;

  assert( pOp->p4type==P4_FUNCCTX );
  pCtx = pOp->p4.pCtx;
  pMem = &aMem[pOp->p3];

#ifdef SQLITE_DEBUG
  if( pOp->p1 ){
    /* This is an OP_AggInverse call.  Verify that xStep has always
    ** been called at least once prior to any xInverse call. */
    assert( pMem->uTemp==0x1122e0e3 );
  }else{
    /* This is an OP_AggStep call.  Mark it as such. */
    pMem->uTemp = 0x1122e0e3;
  }
#endif

  /* If this function is inside of a trigger, the register array in aMem[]
  ** might change from one evaluation to the next.  The next block of code
  ** checks to see if the register array has changed, and if so it
  ** reinitializes the relavant parts of the sqlite3_context object */
  if( pCtx->pMem != pMem ){
    pCtx->pMem = pMem;
    for(i=pCtx->argc-1; i>=0; i--) pCtx->argv[i] = &aMem[pOp->p2+i];

    if( rc ) goto abort_due_to_error;
  }
  assert( pCtx->pOut->flags==MEM_Null );
  assert( pCtx->skipFlag==0 );
  break;
}

/* Opcode: AggFinal P1 P2 * P4 *
/* Opcode: AggFinal P1 P2 P3 P4 *
** Synopsis: accum=r[P1] N=P2
**
** P1 is the memory location that is the accumulator for an aggregate
** or window function.  Execute the finalizer function 
** for an aggregate and store the result in P1.
** or window function. If P3 is zero, then execute the finalizer function 
** for an aggregate and store the result in P1. Or, if P3 is non-zero,
** invoke the xValue() function and store the result in register P3.
**
** P2 is the number of arguments that the step function takes and
** P4 is a pointer to the FuncDef for this function.  The P2
** argument is not used by this opcode.  It is only there to disambiguate
** functions that can take varying numbers of arguments.  The
** P4 argument is only needed for the case where
** the step function was not previously called.
*/
/* Opcode: AggValue * P2 P3 P4 *
** Synopsis: r[P3]=value N=P2
**
** Invoke the xValue() function and store the result in register P3.
**
** P2 is the number of arguments that the step function takes and
** P4 is a pointer to the FuncDef for this function.  The P2
** argument is not used by this opcode.  It is only there to disambiguate
** functions that can take varying numbers of arguments.  The
** P4 argument is only needed for the case where
** the step function was not previously called.
*/
case OP_AggValue:
case OP_AggFinal: {
  Mem *pMem;
  assert( pOp->p1>0 && pOp->p1<=(p->nMem+1 - p->nCursor) );
  assert( pOp->p3==0 || pOp->opcode==OP_AggValue );
  pMem = &aMem[pOp->p1];
  assert( (pMem->flags & ~(MEM_Null|MEM_Agg))==0 );
#ifndef SQLITE_OMIT_WINDOWFUNC
  if( pOp->p3 ){
    rc = sqlite3VdbeMemAggValue(pMem, &aMem[pOp->p3], pOp->p4.pFunc);
    pMem = &aMem[pOp->p3];
  }else
#endif
  {
    rc = sqlite3VdbeMemFinalize(pMem, pOp->p4.pFunc);
  rc = sqlite3VdbeMemFinalize(pMem, pOp->p4.pFunc);
  }
  
  if( rc ){
    sqlite3VdbeError(p, "%s", sqlite3_value_text(pMem));
    goto abort_due_to_error;
  }
  sqlite3VdbeChangeEncoding(pMem, encoding);
  UPDATE_MAX_BLOBSIZE(pMem);

void sqlite3VdbeResolveLabel(Vdbe*, int);
#ifdef SQLITE_COVERAGE_TEST
  int sqlite3VdbeLabelHasBeenResolved(Vdbe*,int);
#endif
int sqlite3VdbeCurrentAddr(Vdbe*);
#ifdef SQLITE_DEBUG
  int sqlite3VdbeAssertMayAbort(Vdbe *, int);
  int sqlite3VdbeAssertAggContext(sqlite3_context*);
#endif
void sqlite3VdbeResetStepResult(Vdbe*);
void sqlite3VdbeRewind(Vdbe*);
int sqlite3VdbeReset(Vdbe*);
void sqlite3VdbeSetNumCols(Vdbe*,int);
int sqlite3VdbeSetColName(Vdbe*, int, int, const char *, void(*)(void*));
void sqlite3VdbeCountChanges(Vdbe*);

  if( (p->pMem->flags & MEM_Agg)==0 ){
    return createAggContext(p, nByte);
  }else{
    return (void*)p->pMem->z;
  }
}

/*
** This function is only used within assert() statements to check that the
** aggregate context has already been allocated. i.e.:
**
**   assert( sqlite3VdbeAssertAggContext(p) );
*/
#ifdef SQLITE_DEBUG
int sqlite3VdbeAssertAggContext(sqlite3_context *p){
  return ((p->pMem->flags & MEM_Agg)!=0);
}
#endif /* SQLITE_DEBUG */

/*
** Return the auxiliary data pointer, if any, for the iArg'th argument to
** the user-function defined by pCtx.
**
** The left-most argument is 0.
**
** Undocumented behavior:  If iArg is negative then access a cache of

  assert( pFunc->xValue!=0 );
  assert( (pAccum->flags & MEM_Null)!=0 || pFunc==pAccum->u.pDef );
  assert( pAccum->db==0 || sqlite3_mutex_held(pAccum->db->mutex) );
  memset(&ctx, 0, sizeof(ctx));
  memset(&t, 0, sizeof(t));
  t.flags = MEM_Null;
  t.db = pAccum->db;
  sqlite3VdbeMemSetNull(pOut);
  ctx.pOut = pOut;
  ctx.pMem = pAccum;
  ctx.pFunc = pFunc;
  pFunc->xValue(&ctx);
  return ctx.isError;
}
#endif /* SQLITE_OMIT_WINDOWFUNC */

  sqlite3_context *pCtx, 
  int nArg,
  sqlite3_value **apArg
){
  struct CallCount *p;
  assert( nArg==1 );

  assert( sqlite3VdbeAssertAggContext(pCtx) );
  p = (struct CallCount*)sqlite3_aggregate_context(pCtx, sizeof(*p));
  if( p ){
  if( ALWAYS(p) ){
    if( p->nTotal==0 ){
      p->nTotal = sqlite3_value_int64(apArg[0]);
    }
    p->nStep++;
    if( p->nValue==0 ){
      p->nValue = p->nStep;
    }

  sqlite3_context *pCtx, 
  int nArg,
  sqlite3_value **apArg
){
  struct CallCount *p;
  assert( nArg==1 );

  assert( sqlite3VdbeAssertAggContext(pCtx) );
  p = (struct CallCount*)sqlite3_aggregate_context(pCtx, sizeof(*p));
  if( p ){
  if( ALWAYS(p) ){
    if( p->nTotal==0 ){
      p->nTotal = sqlite3_value_int64(apArg[0]);
    }
    p->nStep++;
  }
}
static void cume_distInvFunc(

    Window *pNext = p->pNextWin;
    sqlite3WindowDelete(db, p);
    p = pNext;
  }
}

/*
** The argument expression is an PRECEDING or FOLLOWING offset.  The
** value should be a non-negative integer.  If the value is not a
** constant, change it to NULL.  The fact that it is then a non-negative
** integer will be caught later.  But it is important not to leave
** variable values in the expression tree.
*/
static Expr *sqlite3WindowOffsetExpr(Parse *pParse, Expr *pExpr){
  if( 0==sqlite3ExprIsConstant(pExpr) ){
    sqlite3ExprDelete(pParse->db, pExpr);
    pExpr = sqlite3ExprAlloc(pParse->db, TK_NULL, 0, 0);
  }
  return pExpr;
}

/*
** Allocate and return a new Window object describing a Window Definition.
** Allocate and return a new Window object.
*/
Window *sqlite3WindowAlloc(
  Parse *pParse,    /* Parsing context */
  int eType,        /* Frame type. TK_RANGE or TK_ROWS */
  Parse *pParse, 
  int eType,
  int eStart,       /* Start type: CURRENT, PRECEDING, FOLLOWING, UNBOUNDED */
  Expr *pStart,     /* Start window size if TK_PRECEDING or FOLLOWING */
  int eStart, Expr *pStart,
  int eEnd,         /* End type: CURRENT, FOLLOWING, TK_UNBOUNDED, PRECEDING */
  Expr *pEnd        /* End window size if TK_FOLLOWING or PRECEDING */
  int eEnd, Expr *pEnd
){
  Window *pWin = 0;

  /* Parser assures the following: */
  assert( eType==TK_RANGE || eType==TK_ROWS );
  assert( eStart==TK_CURRENT || eStart==TK_PRECEDING
           || eStart==TK_UNBOUNDED || eStart==TK_FOLLOWING );
  assert( eEnd==TK_CURRENT || eEnd==TK_FOLLOWING
           || eEnd==TK_UNBOUNDED || eEnd==TK_PRECEDING );
  assert( (eStart==TK_PRECEDING || eStart==TK_FOLLOWING)==(pStart!=0) );
  assert( (eEnd==TK_FOLLOWING || eEnd==TK_PRECEDING)==(pEnd!=0) );


  /* If a frame is declared "RANGE" (not "ROWS"), then it may not use
  ** either "<expr> PRECEDING" or "<expr> FOLLOWING".
  */
  if( eType==TK_RANGE && (pStart!=0 || pEnd!=0) ){
    sqlite3ErrorMsg(pParse, "RANGE must use only UNBOUNDED or CURRENT ROW");
  if( eType==TK_RANGE && (pStart || pEnd) ){
    sqlite3ErrorMsg(pParse, "RANGE %s is only supported with UNBOUNDED",
    goto windowAllocErr;
  }

        (pStart ? "PRECEDING" : "FOLLOWING")
  /* Additionally, the
  ** starting boundary type may not occur earlier in the following list than
  ** the ending boundary type:
  **
  **   UNBOUNDED PRECEDING
  **   <expr> PRECEDING
  **   CURRENT ROW
  **   <expr> FOLLOWING
  **   UNBOUNDED FOLLOWING
  **
  ** The parser ensures that "UNBOUNDED PRECEDING" cannot be used as an ending
  ** boundary, and than "UNBOUNDED FOLLOWING" cannot be used as a starting
  ** frame boundary.
  */
  if( (eStart==TK_CURRENT && eEnd==TK_PRECEDING)
   || (eStart==TK_FOLLOWING && (eEnd==TK_PRECEDING || eEnd==TK_CURRENT))
  ){
    );
    sqlite3ErrorMsg(pParse, "unsupported frame delimiter for ROWS");
    goto windowAllocErr;
  }else{
    pWin = (Window*)sqlite3DbMallocZero(pParse->db, sizeof(Window));
  }

  pWin = (Window*)sqlite3DbMallocZero(pParse->db, sizeof(Window));
  if( pWin==0 ) goto windowAllocErr;
  pWin->eType = eType;
  pWin->eStart = eStart;
  pWin->eEnd = eEnd;
  pWin->pEnd = sqlite3WindowOffsetExpr(pParse, pEnd);
  pWin->pStart = sqlite3WindowOffsetExpr(pParse, pStart);
  if( pWin ){
    assert( eType );
    pWin->eType = eType;
    pWin->eStart = eStart;
    pWin->eEnd = eEnd;
    pWin->pEnd = pEnd;
    pWin->pStart = pStart;
  return pWin;

  }else{
windowAllocErr:
  sqlite3ExprDelete(pParse->db, pEnd);
  sqlite3ExprDelete(pParse->db, pStart);
  return 0;
    sqlite3ExprDelete(pParse->db, pEnd);
    sqlite3ExprDelete(pParse->db, pStart);
  }

  return pWin;
}

/*
** Attach window object pWin to expression p.
*/
void sqlite3WindowAttach(Parse *pParse, Expr *p, Window *pWin){
  if( p ){
    if( pWin ){
      p->pWin = pWin;
      pWin->pOwner = p;
    p->pWin = pWin;
    if( pWin ) pWin->pOwner = p;
      if( p->flags & EP_Distinct ){
        sqlite3ErrorMsg(pParse,
           "DISTINCT is not supported for window functions");
      }
    }
  }else{
    sqlite3WindowDelete(pParse->db, pWin);
  }
}

/*
** Return 0 if the two window objects are identical, or non-zero otherwise.

/*
** A "PRECEDING <expr>" (bEnd==0) or "FOLLOWING <expr>" (bEnd==1) has just 
** been evaluated and the result left in register reg. This function generates
** VM code to check that the value is a non-negative integer and throws
** an exception if it is not.
*/
static void windowCheckFrameOffset(Parse *pParse, int reg, int bEnd){
static void windowCheckFrameValue(Parse *pParse, int reg, int bEnd){
  static const char *azErr[] = {
    "frame starting offset must be a non-negative integer",
    "frame ending offset must be a non-negative integer"
  };
  Vdbe *v = sqlite3GetVdbe(pParse);
  int regZero = sqlite3GetTempReg(pParse);
  sqlite3VdbeAddOp2(v, OP_Integer, 0, regZero);
  sqlite3VdbeAddOp2(v, OP_MustBeInt, reg, sqlite3VdbeCurrentAddr(v)+2);
  VdbeCoverage(v);
  sqlite3VdbeAddOp3(v, OP_Ge, regZero, sqlite3VdbeCurrentAddr(v)+2, reg);
  VdbeCoverage(v);
  sqlite3VdbeAddOp2(v, OP_Halt, SQLITE_ERROR, OE_Abort);
  sqlite3VdbeAppendP4(v, (void*)azErr[bEnd], P4_STATIC);
  sqlite3ReleaseTempReg(pParse, regZero);
}

** that do not use the standard function API, generate the required
** inline VM code.
**
** If argument csr is greater than or equal to 0, then argument reg is
** the first register in an array of registers guaranteed to be large
** enough to hold the array of arguments for each function. In this case
** the arguments are extracted from the current row of csr into the
** array of registers before invoking OP_AggStep or OP_AggInverse
** array of registers before invoking OP_AggStep.
**
** Or, if csr is less than zero, then the array of registers at reg is
** already populated with all columns from the current row of the sub-query.
**
** If argument regPartSize is non-zero, then it is a register containing the
** number of rows in the current partition.
*/

      assert( !(flags & SQLITE_FUNC_WINDOW_SIZE) );
      regArg = reg + pWin->iArgCol;
    }

    if( (pWin->pFunc->funcFlags & SQLITE_FUNC_MINMAX) 
      && pWin->eStart!=TK_UNBOUNDED 
    ){
      int addrIsNull = sqlite3VdbeAddOp1(v, OP_IsNull, regArg);
      VdbeCoverage(v);
      if( bInverse==0 ){
        sqlite3VdbeAddOp2(v, OP_AddImm, pWin->regApp+1, 1);
        sqlite3VdbeAddOp2(v, OP_SCopy, regArg, pWin->regApp);
        sqlite3VdbeAddOp3(v, OP_MakeRecord, pWin->regApp, 2, pWin->regApp+2);
        sqlite3VdbeAddOp2(v, OP_IdxInsert, pWin->csrApp, pWin->regApp+2);
      }else{
        sqlite3VdbeAddOp4Int(v, OP_SeekGE, pWin->csrApp, 0, regArg, 1);
        VdbeCoverage(v);
        sqlite3VdbeAddOp1(v, OP_Delete, pWin->csrApp);
        sqlite3VdbeJumpHere(v, sqlite3VdbeCurrentAddr(v)-2);
      }
      sqlite3VdbeJumpHere(v, addrIsNull);
    }else if( pWin->regApp ){
      assert( pWin->pFunc->xSFunc==nth_valueStepFunc 
           || pWin->pFunc->xSFunc==first_valueStepFunc 
      );
      assert( bInverse==0 || bInverse==1 );
      sqlite3VdbeAddOp2(v, OP_AddImm, pWin->regApp+1-bInverse, 1);
    }else if( pWin->pFunc->xSFunc==leadStepFunc 

        }
      }
      if( pWin->pFunc->funcFlags & SQLITE_FUNC_NEEDCOLL ){
        CollSeq *pColl;
        pColl = sqlite3ExprNNCollSeq(pParse, pWin->pOwner->x.pList->a[0].pExpr);
        sqlite3VdbeAddOp4(v, OP_CollSeq, 0,0,0, (const char*)pColl, P4_COLLSEQ);
      }
      sqlite3VdbeAddOp3(v, bInverse? OP_AggInverse : OP_AggStep, 
                        bInverse, regArg, pWin->regAccum);
      sqlite3VdbeAddOp3(v, OP_AggStep0, bInverse, regArg, pWin->regAccum);
      sqlite3VdbeAppendP4(v, pWin->pFunc, P4_FUNCDEF);
      sqlite3VdbeChangeP5(v, (u8)nArg);
      if( addrIf ) sqlite3VdbeJumpHere(v, addrIf);
    }
  }
}

      sqlite3VdbeAddOp3(v, OP_Column, pWin->csrApp, 0, pWin->regResult);
      sqlite3VdbeJumpHere(v, sqlite3VdbeCurrentAddr(v)-2);
      if( bFinal ){
        sqlite3VdbeAddOp1(v, OP_ResetSorter, pWin->csrApp);
      }
    }else if( pWin->regApp ){
    }else{
      if( bFinal ){
        sqlite3VdbeAddOp2(v, OP_AggFinal, pWin->regAccum, windowArgCount(pWin));
        sqlite3VdbeAppendP4(v, pWin->pFunc, P4_FUNCDEF);
      if( bFinal==0 ){
        sqlite3VdbeAddOp2(v, OP_Null, 0, pWin->regResult);
      }
      sqlite3VdbeAddOp2(v, OP_AggFinal, pWin->regAccum, windowArgCount(pWin));
      sqlite3VdbeAppendP4(v, pWin->pFunc, P4_FUNCDEF);
      if( bFinal ){
        sqlite3VdbeAddOp2(v, OP_Copy, pWin->regAccum, pWin->regResult);
        sqlite3VdbeAddOp2(v, OP_Null, 0, pWin->regAccum);
      }else{
        sqlite3VdbeAddOp3(v, OP_AggValue, pWin->regAccum, windowArgCount(pWin),
                             pWin->regResult);
        sqlite3VdbeChangeP3(v, -1, pWin->regResult);
        sqlite3VdbeAppendP4(v, pWin->pFunc, P4_FUNCDEF);
      }
    }
  }
}

/*
** This function generates VM code to invoke the sub-routine at address

** from the Window.iEphCsr temp table. This routine generates VM code
** similar to:
**
**   while( regCtr>0 ){
**     regCtr--;
**     windowReturnOneRow()
**     if( bInverse ){
**       AggInverse
**       AggStep (xInverse)
**     }
**     Next (Window.iEphCsr)
**   }
*/
static void windowReturnRows(
  Parse *pParse,
  Window *pMWin,                  /* List of window functions */

**       Next(csrEnd)                    // if EOF skip Aggstep
**       Aggstep (csrEnd)
**       if( (regEnd--)<=0 ){
**         AggFinal (xValue)
**         Gosub addrGosub
**         Next(csr)                // if EOF goto flush_partition_done
**         if( (regStart--)<=0 ){
**           AggInverse (csrStart)
**           AggStep (csrStart, xInverse)
**           Next(csrStart)
**         }
**       }
**   flush_partition_done:
**     ResetSorter (csr)
**     Return
**

**       Aggstep (csrEnd)
**     }
**     while( 1 ){
**       AggFinal (xValue)
**       Gosub addrGosub
**       Next(csr)                     // if EOF goto flush_partition_done
**       if( (regStart--)<=0 ){
**         AggInverse (csrStart)
**         AggStep (csrStart, xInverse)
**         Next(csrStart)
**       }
**     }
**
**   For the "CURRENT ROW AND UNBOUNDED FOLLOWING" case, the final if() 
**   condition is always true (as if regStart were initialized to 0).
**

**       while( 1 ){
**         regPeer++
**         Gosub addrGosub
**         Next(csr)                     // if EOF goto flush_partition_done
**         if( new peer ) break;
**       }
**       while( (regPeer--)>0 ){
**         AggInverse (csrStart)
**         AggStep (csrStart, xInverse)
**         Next(csrStart)
**       }
**     }
**
** ROWS BETWEEN <expr> FOLLOWING    AND <expr> FOLLOWING
**
**   regEnd = regEnd - regStart
**   Rewind (csr,csrStart,csrEnd)   // if EOF goto flush_partition_done
**     Aggstep (csrEnd)
**     Next(csrEnd)                 // if EOF fall-through
**     if( (regEnd--)<=0 ){
**       if( (regStart--)<=0 ){
**         AggFinal (xValue)
**         Gosub addrGosub
**         Next(csr)              // if EOF goto flush_partition_done
**       }
**       AggInverse (csrStart)
**       AggStep (csrStart, xInverse)
**       Next (csrStart)
**     }
**
** ROWS BETWEEN <expr> PRECEDING    AND <expr> PRECEDING
**
**   Replace the bit after "Rewind" in the above with:
**
**     if( (regEnd--)<=0 ){
**       AggStep (csrEnd)
**       Next (csrEnd)
**     }
**     AggFinal (xValue)
**     Gosub addrGosub
**     Next(csr)                  // if EOF goto flush_partition_done
**     if( (regStart--)<=0 ){
**       AggInverse (csr2)
**       AggStep (csr2, xInverse)
**       Next (csr2)
**     }
**
*/
static void windowCodeRowExprStep(
  Parse *pParse, 
  Select *p,

  sqlite3VdbeAddOp2(v, OP_OpenDup, csrStart, pMWin->iEphCsr);
  sqlite3VdbeAddOp2(v, OP_OpenDup, csrEnd, pMWin->iEphCsr);

  /* If either regStart or regEnd are not non-negative integers, throw 
  ** an exception.  */
  if( pMWin->pStart ){
    sqlite3ExprCode(pParse, pMWin->pStart, regStart);
    windowCheckFrameOffset(pParse, regStart, 0);
    windowCheckFrameValue(pParse, regStart, 0);
  }
  if( pMWin->pEnd ){
    sqlite3ExprCode(pParse, pMWin->pEnd, regEnd);
    windowCheckFrameOffset(pParse, regEnd, 1);
    windowCheckFrameValue(pParse, regEnd, 1);
  }

  /* If this is "ROWS <expr1> FOLLOWING AND ROWS <expr2> FOLLOWING", do:
  **
  **   if( regEnd<regStart ){
  **     // The frame always consists of 0 rows
  **     regStart = regSize;

**
** RANGE BETWEEN CURRENT ROW AND CURRENT ROW 
**
**   As above, except that each of the for() loops becomes:
**
**         for(i=0; i<ctr; i++){
**           Gosub addrGosub
**           AggInverse (iEphCsr)
**           AggStep (xInverse, iEphCsr)
**           Next iEphCsr
**         }
**
** RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING
**
**   flush_partition:
**     Once {

**     Rewind (csrLead)
**     Integer ctr 0
**     foreach row (csrLead){
**       if( new peer ){
**         AggFinal (xValue)
**         for(i=0; i<ctr; i++){
**           Gosub addrGosub
**           AggInverse (iEphCsr)
**           AggStep (xInverse, iEphCsr)
**           Next iEphCsr
**         }
**         Integer ctr 0
**       }
**       Incr ctr
**     }
**

execsql_test 9.4 {
  SELECT x, rank() OVER (ORDER BY x) FROM t2 ORDER BY 1,2
}

execsql_test 9.5 {
  SELECT DISTINCT x, rank() OVER (ORDER BY x) FROM t2 ORDER BY 1,2
}

execsql_float_test 9.6 {
  SELECT percent_rank() OVER () FROM t1
}

execsql_float_test 9.7 {
  SELECT cume_dist() OVER () FROM t1
}

execsql_test 10.0 {
  DROP TABLE IF EXISTS t7;
  CREATE TABLE t7(id INTEGER PRIMARY KEY, a INTEGER, b INTEGER);
  INSERT INTO t7(id, a, b) VALUES
    (1, 1, 2), (2, 1, NULL), (3, 1, 4),
    (4, 3, NULL), (5, 3, 8), (6, 3, 1);
}
execsql_test 10.1 {
  SELECT id, min(b) OVER (PARTITION BY a ORDER BY id) FROM t7;
}


finish_test

  SELECT x, rank() OVER (ORDER BY x) FROM t2 ORDER BY 1,2
} {1 1   1 1   1 1   4 4   4 4   6 6   7 7}

do_execsql_test 9.5 {
  SELECT DISTINCT x, rank() OVER (ORDER BY x) FROM t2 ORDER BY 1,2
} {1 1   4 4   6 6   7 7}

do_test 9.6 {
  set myres {}
  foreach r [db eval {SELECT percent_rank() OVER () FROM t1}] {
    lappend myres [format %.2f [set r]]
  }
  set myres
} {0.00 0.00 0.00}

do_test 9.7 {
  set myres {}
  foreach r [db eval {SELECT cume_dist() OVER () FROM t1}] {
    lappend myres [format %.2f [set r]]
  }
  set myres
} {1.00 1.00 1.00}

do_execsql_test 10.0 {
  DROP TABLE IF EXISTS t7;
  CREATE TABLE t7(id INTEGER PRIMARY KEY, a INTEGER, b INTEGER);
  INSERT INTO t7(id, a, b) VALUES
    (1, 1, 2), (2, 1, NULL), (3, 1, 4),
    (4, 3, NULL), (5, 3, 8), (6, 3, 1);
} {}

do_execsql_test 10.1 {
  SELECT id, min(b) OVER (PARTITION BY a ORDER BY id) FROM t7;
} {1 2   2 2   3 2   4 {}   5 8   6 1}

finish_test

} {
  1 1  2 1,2  3 1,2,3  4 2,3,4  5 3,4,5
}
do_catchsql_test 9.1 {
  WITH RECURSIVE c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<5)
  SELECT x, group_concat(x) OVER (ORDER BY x RANGE 2 PRECEDING)
  FROM c;
} {1 {RANGE must use only UNBOUNDED or CURRENT ROW}}

} {1 {RANGE PRECEDING is only supported with UNBOUNDED}}
do_catchsql_test 9.2 {
  WITH RECURSIVE c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<5)
  SELECT x, group_concat(x) OVER (ORDER BY x RANGE BETWEEN UNBOUNDED PRECEDING AND 2 FOLLOWING)
  FROM c;
} {1 {RANGE must use only UNBOUNDED or CURRENT ROW}}

} {1 {RANGE FOLLOWING is only supported with UNBOUNDED}}
do_catchsql_test 9.3 {
  WITH RECURSIVE c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<5)
  SELECT count(DISTINCT x) OVER (ORDER BY x) FROM c;
} {1 {DISTINCT is not supported for window functions}}

do_catchsql_test 9.4 {
  WITH RECURSIVE c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<5)
  SELECT count() OVER (ORDER BY x RANGE UNBOUNDED FOLLOWING) FROM c;
} {1 {near "FOLLOWING": syntax error}}

finish_test
do_catchsql_test 9.5 {
  WITH RECURSIVE c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<5)
  SELECT count() OVER (ORDER BY x RANGE BETWEEN UNBOUNDED FOLLOWING AND UNBOUNDED FOLLOWING) FROM c;
} {1 {near "FOLLOWING": syntax error}}

do_catchsql_test 9.6 {
  WITH RECURSIVE c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<5)
  SELECT count() OVER (ORDER BY x RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED PRECEDING) FROM c;
} {1 {near "PRECEDING": syntax error}}

foreach {tn frame} {
  1 "BETWEEN CURRENT ROW AND 4 PRECEDING"
  2 "4 FOLLOWING"
  3 "BETWEEN 4 FOLLOWING AND CURRENT ROW"
  4 "BETWEEN 4 FOLLOWING AND 2 PRECEDING"
} {
  do_catchsql_test 9.7.$tn "
    WITH RECURSIVE c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<5)
    SELECT count() OVER (
        ORDER BY x ROWS $frame 
    ) FROM c;
  " {1 {unsupported frame delimiter for ROWS}}
}

do_catchsql_test 9.8.1 {
  WITH RECURSIVE c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<5)
  SELECT count() OVER (
      ORDER BY x ROWS BETWEEN a PRECEDING AND 2 FOLLOWING
  ) FROM c;
} {1 {frame starting offset must be a non-negative integer}}
do_catchsql_test 9.8.2 {
  WITH RECURSIVE c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<5)
  SELECT count() OVER (
      ORDER BY x ROWS BETWEEN 2 PRECEDING AND a FOLLOWING
  ) FROM c;
} {1 {frame ending offset must be a non-negative integer}}


finish_test

    WINDOW win1 AS (ORDER BY a ROWS BETWEEN CURRENT ROW AND 1 FOLLOWING),
           win2 AS (ORDER BY a)
  }
} -test {
  faultsim_test_result {0 {5 1 9 5 9 9}}
}

do_faultsim_test 6 -faults oom-* -prep {
  faultsim_restore_and_reopen
} -body {
  execsql {
    SELECT percent_rank() OVER (), cume_dist() OVER () FROM t1
  }
} -test {
  faultsim_test_result {0 {0.0 1.0 0.0 1.0 0.0 1.0}}
}

finish_test