Optimize Operator Input Handling

go/vt/vtgate/planbuilder/operator_transformers.go

@@ -87,12 +87,12 @@ func transformToPrimitive(ctx *plancontext.PlanningContext, op operators.Operato
 }
 
 func transformPercentBasedMirror(ctx *plancontext.PlanningContext, op *operators.PercentBasedMirror) (engine.Primitive, error) {
-	primitive, err := transformToPrimitive(ctx, op.Operator)
+	primitive, err := transformToPrimitive(ctx, op.Operator())
 	if err != nil {
 		return nil, err
 	}
 
-	target, err := transformToPrimitive(ctx.UseMirror(), op.Target)
+	target, err := transformToPrimitive(ctx.UseMirror(), op.Target())
 	// Mirroring is best-effort. If we encounter an error while building the
 	// mirror target primitive, proceed without mirroring.
 	if err != nil {
@@ -169,7 +169,7 @@ func transformSequential(ctx *plancontext.PlanningContext, op *operators.Sequent
 }
 
 func transformInsertionSelection(ctx *plancontext.PlanningContext, op *operators.InsertSelection) (engine.Primitive, error) {
-	rb, isRoute := op.Insert.(*operators.Route)
+	rb, isRoute := op.Insert().(*operators.Route)
 	if !isRoute {
 		return nil, vterrors.VT13001(fmt.Sprintf("Incorrect type encountered: %T (transformInsertionSelection)", op.Insert))
 	}
@@ -198,7 +198,7 @@ func transformInsertionSelection(ctx *plancontext.PlanningContext, op *operators
 
 	eins.Prefix, _, eins.Suffix = generateInsertShardedQuery(ins.AST)
 
-	selectionPlan, err := transformToPrimitive(ctx, op.Select)
+	selectionPlan, err := transformToPrimitive(ctx, op.Select())
 	if err != nil {
 		return nil, err
 	}
@@ -1000,11 +1000,11 @@ func transformVindexPlan(ctx *plancontext.PlanningContext, op *operators.Vindex)
 }
 
 func transformRecurseCTE(ctx *plancontext.PlanningContext, op *operators.RecurseCTE) (engine.Primitive, error) {
-	seed, err := transformToPrimitive(ctx, op.Seed)
+	seed, err := transformToPrimitive(ctx, op.Seed())
 	if err != nil {
 		return nil, err
 	}
-	term, err := transformToPrimitive(ctx, op.Term)
+	term, err := transformToPrimitive(ctx, op.Term())
 	if err != nil {
 		return nil, err
 	}

go/vt/vtgate/planbuilder/operators/SQL_builder.go

@@ -717,9 +717,9 @@ func buildRecursiveCTE(op *RecurseCTE, qb *queryBuilder) {
 		return jc.Original
 	})
 	pred := sqlparser.AndExpressions(predicates...)
-	buildQuery(op.Seed, qb)
+	buildQuery(op.Seed(), qb)
 	qbR := &queryBuilder{ctx: qb.ctx}
-	buildQuery(op.Term, qbR)
+	buildQuery(op.Term(), qbR)
 	qbR.addPredicate(pred)
 	infoFor, err := qb.ctx.SemTable.TableInfoFor(op.OuterID)
 	if err != nil {

go/vt/vtgate/planbuilder/operators/aggregation_pushing.go

@@ -460,8 +460,8 @@ func createJoinPusher(rootAggr *Aggregator, operator Operator) *joinPusher {
 	return &joinPusher{
 		orig: rootAggr,
 		pushed: &Aggregator{
-			Source: operator,
-			QP:     rootAggr.QP,
+			unaryOperator: newUnaryOp(operator),
+			QP:            rootAggr.QP,
 		},
 		columns: initColReUse(len(rootAggr.Columns)),
 		tableID: TableID(operator),

go/vt/vtgate/planbuilder/operators/aggregator.go

@@ -34,7 +34,7 @@ type (
 	// Both all aggregations and no grouping, and the inverse
 	// of all grouping and no aggregations are valid configurations of this operator
 	Aggregator struct {
-		Source  Operator
+		unaryOperator
 		Columns []*sqlparser.AliasedExpr
 
 		WithRollup   bool
@@ -75,14 +75,6 @@ func (a *Aggregator) Clone(inputs []Operator) Operator {
 	return &kopy
 }
 
-func (a *Aggregator) Inputs() []Operator {
-	return []Operator{a.Source}
-}
-
-func (a *Aggregator) SetInputs(operators []Operator) {
-	a.Source = operators[0]
-}
-
 func (a *Aggregator) AddPredicate(_ *plancontext.PlanningContext, expr sqlparser.Expr) Operator {
 	return newFilter(a, expr)
 }

go/vt/vtgate/planbuilder/operators/apply_join.go

@@ -32,7 +32,7 @@ type (
 	// ApplyJoin is a nested loop join - for each row on the LHS,
 	// we'll execute the plan on the RHS, feeding data from left to right
 	ApplyJoin struct {
-		LHS, RHS Operator
+		binaryOperator
 
 		// JoinType is permitted to store only 3 of the possible values
 		// NormalJoinType, StraightJoinType and LeftJoinType.
@@ -85,8 +85,7 @@ type (
 
 func NewApplyJoin(ctx *plancontext.PlanningContext, lhs, rhs Operator, predicate sqlparser.Expr, joinType sqlparser.JoinType) *ApplyJoin {
 	aj := &ApplyJoin{
-		LHS:            lhs,
-		RHS:            rhs,
+		binaryOperator: newBinaryOp(lhs, rhs),
 		Vars:           map[string]int{},
 		JoinType:       joinType,
 		JoinColumns:    &applyJoinColumns{},
@@ -113,16 +112,6 @@ func (aj *ApplyJoin) AddPredicate(ctx *plancontext.PlanningContext, expr sqlpars
 	return AddPredicate(ctx, aj, expr, false, newFilterSinglePredicate)
 }
 
-// Inputs implements the Operator interface
-func (aj *ApplyJoin) Inputs() []Operator {
-	return []Operator{aj.LHS, aj.RHS}
-}
-
-// SetInputs implements the Operator interface
-func (aj *ApplyJoin) SetInputs(inputs []Operator) {
-	aj.LHS, aj.RHS = inputs[0], inputs[1]
-}
-
 func (aj *ApplyJoin) GetLHS() Operator {
 	return aj.LHS
 }

go/vt/vtgate/planbuilder/operators/ast_to_op.go

@@ -65,16 +65,10 @@ func translateQueryToOpWithMirroring(ctx *plancontext.PlanningContext, stmt sqlp
 func createOperatorFromSelect(ctx *plancontext.PlanningContext, sel *sqlparser.Select) Operator {
 	op := crossJoin(ctx, sel.From)
 
-	if sel.Where != nil {
-		op = addWherePredicates(ctx, sel.Where.Expr, op)
-	}
+	op = addWherePredicates(ctx, sel.GetWherePredicate(), op)
 
 	if sel.Comments != nil || sel.Lock != sqlparser.NoLock {
-		op = &LockAndComment{
-			Source:   op,
-			Comments: sel.Comments,
-			Lock:     sel.Lock,
-		}
+		op = newLockAndComment(op, sel.Comments, sel.Lock)
 	}
 
 	op = newHorizon(op, sel)
@@ -88,15 +82,26 @@ func addWherePredicates(ctx *plancontext.PlanningContext, expr sqlparser.Expr, o
 	return sqc.getRootOperator(op, nil)
 }
 
-func addWherePredsToSubQueryBuilder(ctx *plancontext.PlanningContext, expr sqlparser.Expr, op Operator, sqc *SubQueryBuilder) Operator {
+func addWherePredsToSubQueryBuilder(ctx *plancontext.PlanningContext, in sqlparser.Expr, op Operator, sqc *SubQueryBuilder) Operator {
 	outerID := TableID(op)
-	exprs := sqlparser.SplitAndExpression(nil, expr)
-	for _, expr := range exprs {
+	for _, expr := range sqlparser.SplitAndExpression(nil, in) {
 		sqlparser.RemoveKeyspaceInCol(expr)
+		expr = simplifyPredicates(ctx, expr)
 		subq := sqc.handleSubquery(ctx, expr, outerID)
 		if subq != nil {
 			continue
 		}
+		boolean := ctx.IsConstantBool(expr)
+		if boolean != nil {
+			if *boolean {
+				// If the predicate is true, we can ignore it.
+				continue
+			}
+
+			// If the predicate is false, we push down a false predicate to influence routing
+			expr = sqlparser.NewIntLiteral("0")
+		}
+
 		op = op.AddPredicate(ctx, expr)
 		addColumnEquality(ctx, expr)
 	}

go/vt/vtgate/planbuilder/operators/comments.go

@@ -26,25 +26,25 @@ import (
 
 // LockAndComment contains any comments or locking directives we want on all queries down from this operator
 type LockAndComment struct {
-	Source   Operator
+	unaryOperator
 	Comments *sqlparser.ParsedComments
 	Lock     sqlparser.Lock
 }
 
+func newLockAndComment(op Operator, comments *sqlparser.ParsedComments, lock sqlparser.Lock) Operator {
+	return &LockAndComment{
+		unaryOperator: newUnaryOp(op),
+		Comments:      comments,
+		Lock:          lock,
+	}
+}
+
 func (l *LockAndComment) Clone(inputs []Operator) Operator {
 	klon := *l
 	klon.Source = inputs[0]
 	return &klon
 }
 
-func (l *LockAndComment) Inputs() []Operator {
-	return []Operator{l.Source}
-}
-
-func (l *LockAndComment) SetInputs(operators []Operator) {
-	l.Source = operators[0]
-}
-
 func (l *LockAndComment) AddPredicate(ctx *plancontext.PlanningContext, expr sqlparser.Expr) Operator {
 	l.Source = l.Source.AddPredicate(ctx, expr)
 	return l

go/vt/vtgate/planbuilder/operators/cte_merging.go

@@ -22,7 +22,7 @@ import (
 )
 
 func tryMergeRecurse(ctx *plancontext.PlanningContext, in *RecurseCTE) (Operator, *ApplyResult) {
-	op := tryMergeCTE(ctx, in.Seed, in.Term, in)
+	op := tryMergeCTE(ctx, in.Seed(), in.Term(), in)
 	if op == nil {
 		return in, NoRewrite
 	}
@@ -79,17 +79,17 @@ func mergeCTE(ctx *plancontext.PlanningContext, seed, term *Route, r Routing, in
 	hz := in.Horizon
 	hz.Source = term.Source
 	newTerm, _ := expandHorizon(ctx, hz)
+	cte := &RecurseCTE{
+		binaryOperator: newBinaryOp(seed.Source, newTerm),
+		Predicates:     in.Predicates,
+		Def:            in.Def,
+		LeftID:         in.LeftID,
+		OuterID:        in.OuterID,
+		Distinct:       in.Distinct,
+	}
 	return &Route{
-		Routing: r,
-		Source: &RecurseCTE{
-			Predicates: in.Predicates,
-			Def:        in.Def,
-			Seed:       seed.Source,
-			Term:       newTerm,
-			LeftID:     in.LeftID,
-			OuterID:    in.OuterID,
-			Distinct:   in.Distinct,
-		},
-		MergedWith: []*Route{term},
+		Routing:       r,
+		unaryOperator: newUnaryOp(cte),
+		MergedWith:    []*Route{term},
 	}
 }

go/vt/vtgate/planbuilder/operators/delete.go

@@ -75,10 +75,7 @@ func createOperatorFromDelete(ctx *plancontext.PlanningContext, deleteStmt *sqlp
 	op, vTbl = createDeleteOperator(ctx, deleteStmt)
 
 	if deleteStmt.Comments != nil {
-		op = &LockAndComment{
-			Source:   op,
-			Comments: deleteStmt.Comments,
-		}
+		op = newLockAndComment(op, deleteStmt.Comments, sqlparser.NoLock)
 	}
 
 	var err error
@@ -151,10 +148,7 @@ func createDeleteWithInputOp(ctx *plancontext.PlanningContext, del *sqlparser.De
 	}
 
 	if del.Comments != nil {
-		op = &LockAndComment{
-			Source:   op,
-			Comments: del.Comments,
-		}
+		op = newLockAndComment(op, del.Comments, sqlparser.NoLock)
 	}
 	return op
 }
@@ -261,10 +255,7 @@ func createDeleteOperator(ctx *plancontext.PlanningContext, del *sqlparser.Delet
 	}
 
 	if del.Limit != nil {
-		delOp.Source = &Limit{
-			Source: addOrdering(ctx, op, del.OrderBy),
-			AST:    del.Limit,
-		}
+		delOp.Source = newLimit(addOrdering(ctx, op, del.OrderBy), del.Limit, false)
 	} else {
 		delOp.Source = op
 	}
@@ -316,7 +307,7 @@ func addOrdering(ctx *plancontext.PlanningContext, op Operator, orderBy sqlparse
 	if len(order) == 0 {
 		return op
 	}
-	return &Ordering{Source: op, Order: order}
+	return newOrdering(op, order)
 }
 
 func updateQueryGraphWithSource(ctx *plancontext.PlanningContext, input Operator, tblID semantics.TableSet, vTbl *vindexes.Table) *vindexes.Table {

go/vt/vtgate/planbuilder/operators/distinct.go

@@ -26,8 +26,8 @@ import (
 
 type (
 	Distinct struct {
-		Source Operator
-		QP     *QueryProjection
+		unaryOperator
+		QP *QueryProjection
 
 		// When we go from AST to operator, we place DISTINCT ops in the required places in the op tree
 		// These are marked as `Required`, because they are semantically important to the results of the query.
@@ -45,6 +45,14 @@ type (
 	}
 )
 
+func newDistinct(src Operator, qp *QueryProjection, required bool) *Distinct {
+	return &Distinct{
+		unaryOperator: newUnaryOp(src),
+		QP:            qp,
+		Required:      required,
+	}
+}
+
 func (d *Distinct) planOffsets(ctx *plancontext.PlanningContext) Operator {
 	columns := d.GetColumns(ctx)
 	for idx, col := range columns {
@@ -66,22 +74,10 @@ func (d *Distinct) planOffsets(ctx *plancontext.PlanningContext) Operator {
 }
 
 func (d *Distinct) Clone(inputs []Operator) Operator {
-	return &Distinct{
-		Required:          d.Required,
-		Source:            inputs[0],
-		Columns:           slices.Clone(d.Columns),
-		QP:                d.QP,
-		PushedPerformance: d.PushedPerformance,
-		ResultColumns:     d.ResultColumns,
-	}
-}
-
-func (d *Distinct) Inputs() []Operator {
-	return []Operator{d.Source}
-}
-
-func (d *Distinct) SetInputs(operators []Operator) {
-	d.Source = operators[0]
+	kopy := *d
+	kopy.Columns = slices.Clone(d.Columns)
+	kopy.Source = inputs[0]
+	return &kopy
 }
 
 func (d *Distinct) AddPredicate(ctx *plancontext.PlanningContext, expr sqlparser.Expr) Operator {