Disallow Insert with Duplicate key update and Replace Into queries on foreign key column, set locks on fk queries

go/vt/sqlparser/ast.go

@@ -63,6 +63,7 @@ type (
 		GetOrderBy() OrderBy
 		GetLimit() *Limit
 		SetLimit(*Limit)
+		GetLock() Lock
 		SetLock(lock Lock)
 		SetInto(into *SelectInto)
 		SetWith(with *With)

go/vt/sqlparser/ast_funcs.go

@@ -1050,6 +1050,11 @@ func (node *Select) GetLimit() *Limit {
 	return node.Limit
 }
 
+// GetLock returns the lock clause
+func (node *Select) GetLock() Lock {
+	return node.Lock
+}
+
 // SetLock sets the lock clause
 func (node *Select) SetLock(lock Lock) {
 	node.Lock = lock
@@ -1196,6 +1201,11 @@ func (node *Union) GetColumns() SelectExprs {
 	return node.Left.GetColumns()
 }
 
+// GetLock returns the lock clause
+func (node *Union) GetLock() Lock {
+	return node.Lock
+}
+
 // SetLock sets the lock clause
 func (node *Union) SetLock(lock Lock) {
 	node.Lock = lock
@@ -2533,13 +2543,22 @@ func (v *visitor) visitAllSelects(in SelectStatement, f func(p *Select, idx int)
 	panic("switch should be exhaustive")
 }
 
-func IsNonLiteral(updExprs UpdateExprs) bool {
-	for _, updateExpr := range updExprs {
-		switch updateExpr.Expr.(type) {
-		case *Argument, *NullVal, BoolVal, *Literal:
-		default:
-			return true
-		}
+// IsRestrict returns true if the reference action is of restrict type.
+func (ra ReferenceAction) IsRestrict() bool {
+	switch ra {
+	case Restrict, NoAction, DefaultAction:
+		return true
+	default:
+		return false
+	}
+}
+
+// IsLiteral returns true if the expression is of a literal type.
+func IsLiteral(expr Expr) bool {
+	switch expr.(type) {
+	case *Argument, *NullVal, BoolVal, *Literal:
+		return true
+	default:
+		return false
 	}
-	return false
 }

go/vt/sqlparser/comments.go

@@ -273,6 +273,13 @@ func (c *ParsedComments) Length() int {
 	return len(c.comments)
 }
 
+func (c *ParsedComments) GetComments() Comments {
+	if c != nil {
+		return c.comments
+	}
+	return nil
+}
+
 func (c *ParsedComments) Prepend(comment string) Comments {
 	if c == nil {
 		return Comments{comment}

go/vt/vtgate/planbuilder/insert.go

@@ -18,7 +18,9 @@ package planbuilder
 
 import (
 	querypb "vitess.io/vitess/go/vt/proto/query"
+	vschemapb "vitess.io/vitess/go/vt/proto/vschema"
 	"vitess.io/vitess/go/vt/sqlparser"
+	"vitess.io/vitess/go/vt/vterrors"
 	"vitess.io/vitess/go/vt/vtgate/engine"
 	"vitess.io/vitess/go/vt/vtgate/planbuilder/operators"
 	"vitess.io/vitess/go/vt/vtgate/planbuilder/plancontext"
@@ -43,18 +45,24 @@ func gen4InsertStmtPlanner(version querypb.ExecuteOptions_PlannerVersion, insStm
 	// Check single unsharded. Even if the table is for single unsharded but sequence table is used.
 	// We cannot shortcut here as sequence column needs additional planning.
 	ks, tables := ctx.SemTable.SingleUnshardedKeyspace()
-	if ks != nil && tables[0].AutoIncrement == nil {
-		plan := insertUnshardedShortcut(insStmt, ks, tables)
-		plan = pushCommentDirectivesOnPlan(plan, insStmt)
-		return newPlanResult(plan.Primitive(), operators.QualifiedTables(ks, tables)...), nil
+	fkPlanNeeded := false
+	if ks != nil {
+		noAutoInc := tables[0].AutoIncrement == nil
+		fkPlanNeeded = fkManagementRequiredForInsert(ctx, tables[0], sqlparser.UpdateExprs(insStmt.OnDup), insStmt.Action == sqlparser.ReplaceAct)
+		if noAutoInc && !fkPlanNeeded {
+			plan := insertUnshardedShortcut(insStmt, ks, tables)
+			plan = pushCommentDirectivesOnPlan(plan, insStmt)
+			return newPlanResult(plan.Primitive(), operators.QualifiedTables(ks, tables)...), nil
+		}
 	}
 
 	tblInfo, err := ctx.SemTable.TableInfoFor(ctx.SemTable.TableSetFor(insStmt.Table))
 	if err != nil {
 		return nil, err
 	}
-	if tblInfo.GetVindexTable().Keyspace.Sharded && ctx.SemTable.NotUnshardedErr != nil {
-		return nil, ctx.SemTable.NotUnshardedErr
+
+	if err = errOutIfPlanCannotBeConstructed(ctx, tblInfo.GetVindexTable(), insStmt, fkPlanNeeded); err != nil {
+		return nil, err
 	}
 
 	err = queryRewrite(ctx.SemTable, reservedVars, insStmt)
@@ -83,6 +91,41 @@ func gen4InsertStmtPlanner(version querypb.ExecuteOptions_PlannerVersion, insStm
 	return newPlanResult(plan.Primitive(), operators.TablesUsed(op)...), nil
 }
 
+func errOutIfPlanCannotBeConstructed(ctx *plancontext.PlanningContext, vTbl *vindexes.Table, insStmt *sqlparser.Insert, fkPlanNeeded bool) error {
+	if vTbl.Keyspace.Sharded && ctx.SemTable.NotUnshardedErr != nil {
+		return ctx.SemTable.NotUnshardedErr
+	}
+	if insStmt.Action != sqlparser.ReplaceAct {
+		return nil
+	}
+	if fkPlanNeeded {
+		return vterrors.VT12001("REPLACE INTO with foreign keys")
+	}
+	return nil
+}
+
+// TODO: Handle all this in semantic analysis.
+func fkManagementRequiredForInsert(ctx *plancontext.PlanningContext, vTbl *vindexes.Table, updateExprs sqlparser.UpdateExprs, replace bool) bool {
+	ksMode, err := ctx.VSchema.ForeignKeyMode(vTbl.Keyspace.Name)
+	if err != nil || ksMode != vschemapb.Keyspace_FK_MANAGED {
+		return false
+	}
+
+	if len(vTbl.ParentFKsNeedsHandling(ctx.VerifyAllFKs, "")) > 0 {
+		return true
+	}
+
+	childFks := vTbl.ChildFKsNeedsHandling(ctx.VerifyAllFKs, vindexes.UpdateAction)
+	if len(childFks) > 0 && replace {
+		return true
+	}
+
+	// Check if any column in the parent table is being updated which has a child foreign key.
+	return columnModified(updateExprs, func(expr *sqlparser.UpdateExpr) ([]vindexes.ParentFKInfo, []vindexes.ChildFKInfo) {
+		return nil, childFks
+	})
+}
+
 func insertUnshardedShortcut(stmt *sqlparser.Insert, ks *vindexes.Keyspace, tables []*vindexes.Table) logicalPlan {
 	eIns := &engine.Insert{}
 	eIns.Keyspace = ks

go/vt/vtgate/planbuilder/operator_transformers.go

@@ -437,8 +437,15 @@ func transformRoutePlan(ctx *plancontext.PlanningContext, op *operators.Route) (
 
 	replaceSubQuery(ctx, stmt)
 
+	if stmtWithComments, ok := stmt.(sqlparser.Commented); ok && op.Comments != nil {
+		stmtWithComments.SetComments(op.Comments.GetComments())
+	}
+
 	switch stmt := stmt.(type) {
 	case sqlparser.SelectStatement:
+		if op.Lock != sqlparser.NoLock {
+			stmt.SetLock(op.Lock)
+		}
 		return buildRouteLogicalPlan(ctx, op, stmt)
 	case *sqlparser.Update:
 		return buildUpdateLogicalPlan(ctx, op, dmlOp, stmt)