feat+fix(FiveSql2): window frame spec execution + EXISTS LIMIT safety
--- #12 Window frame spec now honoured --- Parser parsed ROWS BETWEEN ... AND ... but discarded the result. Now stores hFrame in a 6th slot on ND_WINDOW nodes via AAdd. ApplyWindowFunctions reads it and computes per-row frame boundaries via SqlFrameOffset helper. Unified SUM/AVG/COUNT/MIN/MAX into one frame-aware CASE branch. --- #6 EXISTS LIMIT mutation removed --- Removed direct parse-tree mutation (hQuery["limit"] := 1) that would corrupt reuse. Semi-join lift handles the fast case. Validation: 43/43 + 51/51 + go test ALL PASS Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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@@ -622,10 +622,9 @@ METHOD EvalExpr( xNode ) CLASS TSqlExecutor
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RETURN aSubResult
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ENDIF
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/* Fallback: LIMIT 1 + cached run */
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IF ValType( xNode[ 3 ][ 1 ][ 2 ] ) == "H"
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xNode[ 3 ][ 1 ][ 2 ][ "limit" ] := 1
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ENDIF
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/* Fallback: LIMIT 1 + cached run.
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* SubqueryCached clones the hQuery per-Run, so this LIMIT
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* won't corrupt subsequent runs. Safe even if plan is reused. */
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aSubResult := ::SubqueryCached( xNode[ 3 ][ 1 ] )
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IF ValType( aSubResult ) == "A" .AND. Len( aSubResult ) >= 2 .AND. ;
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ValType( aSubResult[ 2 ] ) == "A"
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@@ -2943,6 +2942,7 @@ METHOD ApplyWindowFunctions( aRows, aFN, aCols ) CLASS TSqlExecutor
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LOCAL nLagLead, nArgCol, xDefault
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LOCAL nRunSum, nRunCount
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LOCAL aWinCols, nWC
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LOCAL hFrame, nFS, nFE, m, xVal, xMin, xMax
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/* Scan for window function columns */
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aWinCols := {}
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@@ -2964,6 +2964,11 @@ METHOD ApplyWindowFunctions( aRows, aFN, aCols ) CLASS TSqlExecutor
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aFuncArgs := xExpr[ 3 ]
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aPartBy := xExpr[ 4 ]
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aOrdBy := xExpr[ 5 ]
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/* Frame spec in optional 6th slot (added by parser) */
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hFrame := NIL
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IF Len( xExpr ) >= 6
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hFrame := xExpr[ 6 ]
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ENDIF
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/* Build partition groups as arrays of row indices */
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hPartitions := { => }
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@@ -3083,7 +3088,11 @@ METHOD ApplyWindowFunctions( aRows, aFN, aCols ) CLASS TSqlExecutor
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ENDIF
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NEXT
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CASE cFunc == "SUM"
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CASE cFunc == "SUM" .OR. cFunc == "AVG" .OR. cFunc == "COUNT" .OR. ;
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cFunc == "MIN" .OR. cFunc == "MAX"
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/* Frame-aware aggregate window functions.
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* Default frame (no spec): UNBOUNDED PRECEDING to CURRENT ROW.
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* Explicit: ROWS BETWEEN n PRECEDING AND m FOLLOWING, etc. */
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nArgCol := 0
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IF Len( aFuncArgs ) >= 1
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nArgCol := SqlFindColIdx( aFuncArgs[ 1 ], aFN )
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@@ -3091,37 +3100,65 @@ METHOD ApplyWindowFunctions( aRows, aFN, aCols ) CLASS TSqlExecutor
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nArgCol := SqlFindColIdx2( SqlExprName( aFuncArgs[ 1 ] ), aFN )
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ENDIF
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ENDIF
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nRunSum := 0
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FOR k := 1 TO Len( aPartIdx )
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IF nArgCol > 0 .AND. nArgCol <= Len( aRows[ aPartIdx[ k ] ] )
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nRunSum += SqlCoerceNum( aRows[ aPartIdx[ k ] ][ nArgCol ] )
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ENDIF
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IF nColIdx <= Len( aRows[ aPartIdx[ k ] ] )
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aRows[ aPartIdx[ k ] ][ nColIdx ] := nRunSum
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ENDIF
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NEXT
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CASE cFunc == "AVG"
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nArgCol := 0
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IF Len( aFuncArgs ) >= 1
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nArgCol := SqlFindColIdx( aFuncArgs[ 1 ], aFN )
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IF nArgCol == 0
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nArgCol := SqlFindColIdx2( SqlExprName( aFuncArgs[ 1 ] ), aFN )
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ENDIF
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ENDIF
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nRunSum := 0
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nRunCount := 0
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FOR k := 1 TO Len( aPartIdx )
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IF nArgCol > 0 .AND. nArgCol <= Len( aRows[ aPartIdx[ k ] ] )
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nRunSum += SqlCoerceNum( aRows[ aPartIdx[ k ] ][ nArgCol ] )
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nRunCount++
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ENDIF
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IF nColIdx <= Len( aRows[ aPartIdx[ k ] ] )
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IF nRunCount > 0
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aRows[ aPartIdx[ k ] ][ nColIdx ] := nRunSum / nRunCount
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ELSE
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aRows[ aPartIdx[ k ] ][ nColIdx ] := 0
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/* Compute frame boundaries for this row */
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nFS := 1 /* default: UNBOUNDED PRECEDING */
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nFE := k /* default: CURRENT ROW */
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IF hFrame != NIL .AND. ValType( hFrame ) == "H"
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IF hb_HHasKey( hFrame, "start" )
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nFS := SqlFrameOffset( hFrame[ "start" ], k, Len( aPartIdx ) )
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ENDIF
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IF hb_HHasKey( hFrame, "end" )
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nFE := SqlFrameOffset( hFrame[ "end" ], k, Len( aPartIdx ) )
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ELSE
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nFE := k
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ENDIF
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ENDIF
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IF nFS < 1
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nFS := 1
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ENDIF
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IF nFE > Len( aPartIdx )
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nFE := Len( aPartIdx )
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ENDIF
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/* Aggregate over the frame window */
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nRunSum := 0
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nRunCount := 0
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xMin := NIL
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xMax := NIL
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FOR m := nFS TO nFE
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IF cFunc == "COUNT" .AND. nArgCol == 0
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/* COUNT(*) */
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nRunCount++
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ELSEIF nArgCol > 0 .AND. nArgCol <= Len( aRows[ aPartIdx[ m ] ] )
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xVal := aRows[ aPartIdx[ m ] ][ nArgCol ]
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IF xVal != NIL
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nRunCount++
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nRunSum += SqlCoerceNum( xVal )
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IF xMin == NIL .OR. SqlCmpLt( xVal, xMin )
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xMin := xVal
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ENDIF
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IF xMax == NIL .OR. SqlCmpLt( xMax, xVal )
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xMax := xVal
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ENDIF
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ENDIF
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ENDIF
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NEXT
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IF nColIdx <= Len( aRows[ aPartIdx[ k ] ] )
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DO CASE
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CASE cFunc == "SUM"
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aRows[ aPartIdx[ k ] ][ nColIdx ] := nRunSum
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CASE cFunc == "AVG"
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aRows[ aPartIdx[ k ] ][ nColIdx ] := iif( nRunCount > 0, nRunSum / nRunCount, NIL )
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CASE cFunc == "COUNT"
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aRows[ aPartIdx[ k ] ][ nColIdx ] := nRunCount
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CASE cFunc == "MIN"
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aRows[ aPartIdx[ k ] ][ nColIdx ] := xMin
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CASE cFunc == "MAX"
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aRows[ aPartIdx[ k ] ][ nColIdx ] := xMax
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ENDCASE
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ENDIF
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NEXT
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@@ -3280,6 +3317,40 @@ RETURN { { "affected_rows" }, { { nAffected } } }
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/* ======================================================================
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* Window function helper: compare two rows by ORDER BY columns
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* ====================================================================== */
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/* Convert a parsed frame bound string into an absolute row index.
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* cBound examples: "UNBOUNDED PRECEDING", "3 PRECEDING", "CURRENT ROW",
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* "2 FOLLOWING", "UNBOUNDED FOLLOWING".
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* nCurr = 1-based position of the current row within the partition.
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* nPartLen = total rows in the partition. */
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FUNCTION SqlFrameOffset( cBound, nCurr, nPartLen )
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LOCAL nV
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IF cBound == NIL .OR. Empty( cBound )
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RETURN nCurr
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ENDIF
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IF "UNBOUNDED PRECEDING" $ cBound
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RETURN 1
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ENDIF
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IF "UNBOUNDED FOLLOWING" $ cBound
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RETURN nPartLen
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ENDIF
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IF "CURRENT ROW" $ cBound
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RETURN nCurr
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ENDIF
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IF "PRECEDING" $ cBound
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nV := Val( cBound )
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RETURN Max( 1, nCurr - nV )
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ENDIF
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IF "FOLLOWING" $ cBound
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nV := Val( cBound )
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RETURN Min( nPartLen, nCurr + nV )
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ENDIF
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RETURN nCurr
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FUNCTION SqlWinRowCmp( aRows, nIdxA, nIdxB, aOrdBy, aFN )
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LOCAL i, nCol, cDir, xA, xB
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@@ -2009,7 +2009,7 @@ RETURN { aPartBy, aOrdBy, hFrame }
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/* Parse OVER(...) for window functions */
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METHOD ParseWindow( cFuncName, aFuncArgs ) CLASS TSqlParser2
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LOCAL aSpec
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LOCAL aSpec, xWinNode
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::nPos++ /* eat OVER */
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@@ -2021,8 +2021,12 @@ METHOD ParseWindow( cFuncName, aFuncArgs ) CLASS TSqlParser2
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ENDIF
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aSpec := ::ParseWindowSpec()
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/* Store frame spec (aSpec[3]) in a 6th slot on the node — can't fit
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* in the 5-slot SqlNode, so AAdd post-construction. */
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xWinNode := SqlNode( ND_WINDOW, cFuncName, aFuncArgs, aSpec[ 1 ], aSpec[ 2 ] )
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AAdd( xWinNode, aSpec[ 3 ] )
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RETURN SqlNode( ND_WINDOW, cFuncName, aFuncArgs, aSpec[ 1 ], aSpec[ 2 ] )
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RETURN xWinNode
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/* Parse frame clause: ROWS/RANGE/GROUPS BETWEEN ... AND ... (SQL:2003/2011) */
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