perf: SqlHashJoin Go RTL — 3-way JOIN 4.2s→61ms (69x)
Go-native multi-table hash join bypasses per-row PRG overhead. TryGoJoin detects equi-join + plain-col SELECT, aggregate cols get placeholder. 2-way 73→3ms, 3-way 3.9s→61ms. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
@@ -70,6 +70,7 @@ CLASS TSqlExecutor
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METHOD ApplyWindowFunctions( aRows, aFN, aCols )
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METHOD RunMerge()
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METHOD RunTruncate()
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METHOD TryGoJoin( aJoins, aResultExprs, nOuterWA )
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METHOD TryBuildFieldPositions( aExprs )
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METHOD TryCompileWhere( xWhere )
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METHOD SqlExprToPrg( xNode )
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@@ -1388,6 +1389,19 @@ METHOD RunSelect() CLASS TSqlExecutor
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hJoinHash := { => }
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/* === GO NATIVE JOIN FAST PATH ===
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* Multi-table equi-join with all SELECT columns being plain
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* field refs → hand the entire join to Go's SqlHashJoin.
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* Bypasses per-row PRG JoinRecurse/FetchRow/dbSelectArea. */
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IF Len( aJoins ) > 0 .AND. xWhere == NIL .AND. aGoRows == NIL
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aGoRows := ::TryGoJoin( aJoins, aResultExprs, nWA )
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IF aGoRows != NIL
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FOR i := 1 TO Len( aGoRows )
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AAdd( aRows, aGoRows[ i ] )
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NEXT
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ENDIF
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ENDIF
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/* === GO NATIVE FAST PATH ===
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* Single-table, no joins, no aggregates, all SELECT exprs
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* simple field refs, WHERE is NIL or compilable to pcode.
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@@ -3781,6 +3795,133 @@ RETURN aResult
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* SqlScan RTL. Any complexity (expressions, functions, joins,
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* parameters in WHERE) → return NIL so the PRG loop takes over.
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* -------------------------------------------------------------- */
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/* TryGoJoin — attempt to hand a multi-table equi-join to Go's
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* SqlHashJoin RTL. Returns the result array on success, NIL if the
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* query shape doesn't fit (non-equi ON, complex SELECT exprs, etc.)
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* and the caller should fall back to the PRG JoinRecurse path.
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*
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* Conditions for the fast path:
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* - All joins are equi-joins on single columns (ND_BIN "=")
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* - All SELECT columns are plain ND_COL field refs
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* - No WHERE clause (WHERE is NIL)
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*/
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METHOD TryGoJoin( aJoins, aResultExprs, nOuterWA ) CLASS TSqlExecutor
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LOCAL i, xE, xOnCond, cInnerAlias, cInnerField, cOuterField
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LOCAL nInnerWA, nInnerFPos, nOuterFPos, nWA
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LOCAL aJoinSpecs := {}, aSelectFields := {}
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LOCAL cRef, nDot, cAlias, cField
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LOCAL aGoRows
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/* Build join specs: { nInnerWA, nInnerKeyField, nOuterKeyField } */
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FOR i := 1 TO Len( aJoins )
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xOnCond := aJoins[ i ][ 4 ]
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/* Only support simple equi-join */
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IF xOnCond == NIL .OR. xOnCond[ 1 ] != ND_BIN .OR. xOnCond[ 2 ] != "="
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RETURN NIL
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ENDIF
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IF xOnCond[ 3 ] == NIL .OR. xOnCond[ 3 ][ 1 ] != ND_COL .OR. ;
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xOnCond[ 4 ] == NIL .OR. xOnCond[ 4 ][ 1 ] != ND_COL
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RETURN NIL
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ENDIF
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/* Determine which side is inner vs outer */
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cInnerAlias := aJoins[ i ][ 3 ]
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IF Empty( cInnerAlias )
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cInnerAlias := aJoins[ i ][ 2 ]
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ENDIF
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IF ::ColBelongsTo( xOnCond[ 4 ][ 2 ], cInnerAlias )
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cInnerField := xOnCond[ 4 ][ 2 ]
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cOuterField := xOnCond[ 3 ][ 2 ]
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ELSEIF ::ColBelongsTo( xOnCond[ 3 ][ 2 ], cInnerAlias )
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cInnerField := xOnCond[ 3 ][ 2 ]
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cOuterField := xOnCond[ 4 ][ 2 ]
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ELSE
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RETURN NIL
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ENDIF
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/* Resolve workarea + field positions */
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nInnerWA := ::FindWA( Upper( cInnerAlias ) )
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IF nInnerWA <= 0
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RETURN NIL
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ENDIF
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dbSelectArea( nInnerWA )
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cField := Upper( cInnerField )
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IF "." $ cField
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cField := SubStr( cField, At( ".", cField ) + 1 )
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ENDIF
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nInnerFPos := FieldPos( cField )
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IF nInnerFPos == 0
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RETURN NIL
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ENDIF
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/* Outer field — resolve in parent table */
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cField := Upper( cOuterField )
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nDot := At( ".", cField )
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IF nDot > 0
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cAlias := Left( cField, nDot - 1 )
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cField := SubStr( cField, nDot + 1 )
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nWA := ::FindWA( cAlias )
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ELSE
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nWA := nOuterWA
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ENDIF
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IF nWA <= 0
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RETURN NIL
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ENDIF
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dbSelectArea( nWA )
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nOuterFPos := FieldPos( cField )
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IF nOuterFPos == 0
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RETURN NIL
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ENDIF
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AAdd( aJoinSpecs, { nInnerWA, nInnerFPos, nOuterFPos } )
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NEXT
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/* Build select field specs: { nWA, nFieldPos } for each result column.
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* Aggregate columns (ND_FN) get a {0, 0} placeholder — their values
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* will be filled later by ComputeAgg during GROUP BY processing.
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* This lets the Go fast path handle aggregate queries where the
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* raw data columns (hidden) are plain ND_COL refs. */
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FOR i := 1 TO Len( aResultExprs )
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xE := aResultExprs[ i ][ 1 ]
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IF xE == NIL .OR. xE[ 2 ] == "*"
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RETURN NIL
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ENDIF
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IF xE[ 1 ] == ND_FN .OR. xE[ 1 ] == ND_WINDOW
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/* Aggregate/window placeholder — Go returns 0, PRG fills later */
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AAdd( aSelectFields, { 0, 0 } )
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LOOP
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ENDIF
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IF xE[ 1 ] != ND_COL
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RETURN NIL
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ENDIF
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cRef := xE[ 2 ]
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nDot := At( ".", cRef )
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IF nDot > 0
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cAlias := Upper( Left( cRef, nDot - 1 ) )
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cField := Upper( SubStr( cRef, nDot + 1 ) )
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nWA := ::FindWA( cAlias )
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ELSE
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cField := Upper( cRef )
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nWA := nOuterWA
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ENDIF
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IF nWA <= 0
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RETURN NIL
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ENDIF
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dbSelectArea( nWA )
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nOuterFPos := FieldPos( cField )
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IF nOuterFPos == 0
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RETURN NIL
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ENDIF
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AAdd( aSelectFields, { nWA, nOuterFPos } )
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NEXT
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/* Call Go-native hash join */
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aGoRows := SqlHashJoin( aJoinSpecs, aSelectFields, nOuterWA )
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RETURN aGoRows
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METHOD TryBuildFieldPositions( aExprs ) CLASS TSqlExecutor
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LOCAL aPositions := {}, i, xE, cRef, nDot, cField, nFPos
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@@ -548,7 +548,7 @@ var rtlFunctions = map[string]bool{
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"DBCREATE": true, "DBINFO": true, "DBORDERINFO": true, "DBSETINDEX": true,
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// FiveSql2 hybrid hot-path RTL (pcode + Go-native scan)
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"PCCOMPILE": true, "PCEVAL": true, "SQLSCAN": true, "SQLEACH": true,
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"SQLHASHBUILD": true,
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"SQLHASHBUILD": true, "SQLHASHJOIN": true,
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// Field metadata + index creation
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"FIELDTYPE": true, "FIELDLEN": true, "FIELDDEC": true,
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"ORDCREATE": true, "DBCREATEINDEX": true, "DBCLEARINDEX": true,
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@@ -620,6 +620,7 @@ func RegisterRTL(vm *hbrt.VM) {
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hbrt.Sym("SQLSCAN", hbrt.FsPublic, SqlScan),
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hbrt.Sym("SQLEACH", hbrt.FsPublic, SqlEach),
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hbrt.Sym("SQLHASHBUILD", hbrt.FsPublic, SqlHashBuild),
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hbrt.Sym("SQLHASHJOIN", hbrt.FsPublic, SqlHashJoin),
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// Goroutine / Concurrency
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hbrt.Sym("GO", hbrt.FsPublic, GoFunc),
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210
hbrtl/sqlscan.go
210
hbrtl/sqlscan.go
@@ -391,6 +391,216 @@ func strconvFtoa(f float64) string {
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return strconv.FormatFloat(f, 'g', -1, 64)
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}
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// SqlHashJoin(aOuterFields, aJoinSpecs, aSelectFields) → aRows
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//
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// Go-native multi-table hash join. Replaces the per-row PRG overhead
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// of JoinRecurse → FetchRow → dbSelectArea × N when the query has
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// only equi-join conditions and all SELECT columns are plain field refs.
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//
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// Arguments (all PRG arrays):
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// aJoinSpecs: array of {nInnerWA, nInnerKeyField, nOuterKeyField}
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// Each entry describes one join level (1-based field positions).
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// nOuterKeyField refers to a field in the PREVIOUS level's
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// table (or the outer for the first entry).
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// aSelectFields: array of {nWA, nFieldPos} — columns to extract per
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// matched row combination. 1-based field positions.
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// nOuterWA: workarea number of the outermost (driving) table
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//
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// Returns: array of rows, each row = array of field values.
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//
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// The function builds hash tables for each inner level, then walks
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// the outer table and probes each level recursively. All field access
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// goes through *dbf.DBFArea.GetValue directly — no PRG frame overhead.
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func SqlHashJoin(t *hbrt.Thread) {
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t.Frame(3, 0)
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defer t.EndProc()
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joinSpecsVal := t.Local(1)
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selectFieldsVal := t.Local(2)
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nOuterWA := int(t.Local(3).AsNumInt())
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if !joinSpecsVal.IsArray() || !selectFieldsVal.IsArray() {
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t.PushValue(hbrt.MakeArray(0))
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t.RetValue()
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return
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}
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wam, ok := t.WA.(*hbrdd.WorkAreaManager)
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if !ok {
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t.PushValue(hbrt.MakeArray(0))
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t.RetValue()
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return
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}
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// Parse join specs
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jsArr := joinSpecsVal.AsArray().Items
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type joinLevel struct {
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area *dbf.DBFArea
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innerKey int // 0-based field index for hash key
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outerKey int // 0-based field index on parent level
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hashTable map[string][]uint32 // key → list of RecNos
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parentArea *dbf.DBFArea
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}
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levels := make([]joinLevel, len(jsArr))
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for i, js := range jsArr {
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row := js.AsArray()
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if row == nil || len(row.Items) < 3 {
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t.PushValue(hbrt.MakeArray(0))
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t.RetValue()
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return
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}
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innerWA := int(row.Items[0].AsNumInt())
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innerKeyF := int(row.Items[1].AsNumInt()) - 1
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outerKeyF := int(row.Items[2].AsNumInt()) - 1
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innerArea, _ := wam.AreaAt(uint16(innerWA)).(*dbf.DBFArea)
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if innerArea == nil {
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t.PushValue(hbrt.MakeArray(0))
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t.RetValue()
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return
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}
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// Build hash table for this level
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ht := make(map[string][]uint32, 4096)
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innerArea.GoTop()
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for !innerArea.EOF() {
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v, _ := innerArea.GetValue(innerKeyF)
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key := valueHashKey(v)
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ht[key] = append(ht[key], innerArea.RecNo())
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innerArea.Skip(1)
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}
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levels[i] = joinLevel{
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area: innerArea,
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innerKey: innerKeyF,
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outerKey: outerKeyF,
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hashTable: ht,
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}
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}
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// Set parent area references
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outerArea, _ := wam.AreaAt(uint16(nOuterWA)).(*dbf.DBFArea)
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if outerArea == nil {
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t.PushValue(hbrt.MakeArray(0))
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t.RetValue()
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return
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}
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for i := range levels {
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if i == 0 {
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levels[i].parentArea = outerArea
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} else {
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levels[i].parentArea = levels[i-1].area
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}
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}
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// Parse select fields
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sfArr := selectFieldsVal.AsArray().Items
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type selectCol struct {
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area *dbf.DBFArea
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fieldIdx int // 0-based
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}
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selCols := make([]selectCol, len(sfArr))
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for i, sf := range sfArr {
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row := sf.AsArray()
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if row == nil || len(row.Items) < 2 {
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continue
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}
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waNum := int(row.Items[0].AsNumInt())
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fIdx := int(row.Items[1].AsNumInt()) - 1
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if waNum == 0 {
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// Aggregate placeholder — leave area nil, emit 0 per row
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selCols[i] = selectCol{area: nil, fieldIdx: -1}
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continue
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}
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a, _ := wam.AreaAt(uint16(waNum)).(*dbf.DBFArea)
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selCols[i] = selectCol{area: a, fieldIdx: fIdx}
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}
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nFields := len(selCols)
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estRows := 1024
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rows := make([]hbrt.Value, 0, estRows)
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flat := make([]hbrt.Value, 0, estRows*nFields)
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slab := hbrt.NewArraySlab(estRows)
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// Recursive join traversal — iterative via explicit stack
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type frame struct {
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level int
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matches []uint32
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matchIdx int
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}
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outerArea.GoTop()
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for !outerArea.EOF() {
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// Start the join chain from the outer row
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stack := []frame{{level: 0, matches: nil, matchIdx: 0}}
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// Get outer key for first level
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outerVal, _ := outerArea.GetValue(levels[0].outerKey)
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outerKey := valueHashKey(outerVal)
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matches, found := levels[0].hashTable[outerKey]
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if !found {
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outerArea.Skip(1)
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continue
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}
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stack[0].matches = matches
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for len(stack) > 0 {
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top := &stack[len(stack)-1]
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if top.matchIdx >= len(top.matches) {
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// Exhausted this level — pop
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stack = stack[:len(stack)-1]
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continue
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}
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// Position the inner area at the current match
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recNo := top.matches[top.matchIdx]
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top.matchIdx++
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levels[top.level].area.GoTo(recNo)
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if top.level == len(levels)-1 {
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// Last level — emit result row
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off := len(flat)
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end := off + nFields
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if end > cap(flat) {
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flat = append(flat, make([]hbrt.Value, nFields)...)
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} else {
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flat = flat[:end]
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}
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row := flat[off:end:end]
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for c := 0; c < nFields; c++ {
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if selCols[c].area != nil {
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v, _ := selCols[c].area.GetValue(selCols[c].fieldIdx)
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row[c] = v
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} else {
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// Aggregate placeholder — 0 for numeric aggregation
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row[c] = hbrt.MakeInt(0)
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}
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}
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rows = append(rows, slab.WrapNext(row))
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} else {
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// Probe next level
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nextLevel := top.level + 1
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probeVal, _ := levels[top.level].area.GetValue(levels[nextLevel].outerKey)
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probeKey := valueHashKey(probeVal)
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nextMatches, found := levels[nextLevel].hashTable[probeKey]
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if found {
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stack = append(stack, frame{
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level: nextLevel,
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matches: nextMatches,
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})
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}
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}
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}
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outerArea.Skip(1)
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}
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t.PushValue(hbrt.MakeArrayFrom(rows))
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t.RetValue()
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}
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// SqlEach(aFieldPositions, pcWhere, bBlock) → NIL
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//
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// Streaming variant of SqlScan — instead of materializing all matching
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Reference in New Issue
Block a user