removing now unused code

Author: James Cor

engine.go

@@ -866,6 +866,7 @@ func findCreateEventNode(planTree sql.Node) (*plan.CreateEvent, error) {
 
 // finalizeIters applies the final transformations on sql.RowIter before execution.
 func finalizeIters(ctx *sql.Context, analyzed sql.Node, qFlags *sql.QueryFlags, iter sql.RowIter) sql.RowIter {
+	iter = rowexec.AddTriggerRollbackIter(ctx, analyzed, iter)
 	iter = rowexec.AddTransactionCommittingIter(qFlags, iter)
 	iter = plan.AddTrackedRowIter(ctx, analyzed, iter)
 	iter = rowexec.AddExpressionCloser(analyzed, iter)

sql/analyzer/rule_ids.go

@@ -68,7 +68,6 @@ const (
 	assignRoutinesId             // assignRoutines
 	modifyUpdateExprsForJoinId   // modifyUpdateExprsForJoin
 	applyUpdateAccumulatorsId    // applyUpdateAccumulators
-	wrapWithRollbackId           // wrapWithRollback
 	applyForeignKeysId           // applyForeignKeys
 
 	// validate

sql/analyzer/ruleid_string.go

@@ -22,7 +22,6 @@ func init() {
 		{applyTriggersId, applyTriggers},
 		{applyProceduresId, applyProcedures},
 		{applyUpdateAccumulatorsId, applyUpdateAccumulators},
-		{wrapWithRollbackId, wrapWithRollback},
 		{inlineSubqueryAliasRefsId, inlineSubqueryAliasRefs},
 		{cacheSubqueryAliasesInJoinsId, cacheSubqueryAliasesInJoins},
 		{BacktickDefaulColumnValueNamesId, backtickDefaultColumnValueNames},

sql/analyzer/rules.go

@@ -517,41 +517,3 @@ func orderTriggersAndReverseAfter(triggers []*plan.CreateTrigger) []*plan.Create
 func triggerEventsMatch(event plan.TriggerEvent, event2 string) bool {
 	return strings.ToLower((string)(event)) == strings.ToLower(event2)
 }
-
-// wrapWithRollback wraps the entire tree iff it contains a trigger, allowing rollback when a trigger errors
-func wrapWithRollback(ctx *sql.Context, a *Analyzer, n sql.Node, scope *plan.Scope, sel RuleSelector, qFlags *sql.QueryFlags) (sql.Node, transform.TreeIdentity, error) {
-	// Check if tree contains a TriggerExecutor
-	containsTrigger := false
-	transform.Inspect(n, func(n sql.Node) bool {
-		// After Triggers wrap nodes
-		if _, ok := n.(*plan.TriggerExecutor); ok {
-			containsTrigger = true
-			return false // done, don't bother to recurse
-		}
-
-		// Before Triggers on Inserts are inside Source
-		if n, ok := n.(*plan.InsertInto); ok {
-			if _, ok := n.Source.(*plan.TriggerExecutor); ok {
-				containsTrigger = true
-				return false
-			}
-		}
-
-		// Before Triggers on Delete and Update should be in children
-		return true
-	})
-
-	// No TriggerExecutor, so return same tree
-	if !containsTrigger {
-		return n, transform.SameTree, nil
-	}
-
-	// If we don't have a transaction session we can't do rollbacks
-	_, ok := ctx.Session.(sql.TransactionSession)
-	if !ok {
-		return plan.NewNoopTriggerRollback(n), transform.NewTree, nil
-	}
-
-	// Wrap tree with new node
-	return plan.NewTriggerRollback(n), transform.NewTree, nil
-}

sql/analyzer/triggers.go

@@ -102,104 +102,4 @@ func (t *TriggerExecutor) CheckPrivileges(ctx *sql.Context, opChecker sql.Privil
 // CollationCoercibility implements the interface sql.CollationCoercible.
 func (t *TriggerExecutor) CollationCoercibility(ctx *sql.Context) (collation sql.CollationID, coercibility byte) {
 	return sql.GetCoercibility(ctx, t.left)
-}
-
-// TriggerRollback is a node that wraps the entire tree iff it contains a trigger, creates a savepoint, and performs a
-// rollback if something went wrong during execution
-type TriggerRollback struct {
-	UnaryNode
-}
-
-var _ sql.Node = (*TriggerRollback)(nil)
-var _ sql.CollationCoercible = (*TriggerRollback)(nil)
-
-func NewTriggerRollback(child sql.Node) *TriggerRollback {
-	return &TriggerRollback{
-		UnaryNode: UnaryNode{Child: child},
-	}
-}
-
-func (t *TriggerRollback) WithChildren(children ...sql.Node) (sql.Node, error) {
-	if len(children) != 1 {
-		return nil, sql.ErrInvalidChildrenNumber.New(t, len(children), 1)
-	}
-
-	return NewTriggerRollback(children[0]), nil
-}
-
-// CheckPrivileges implements the interface sql.Node.
-func (t *TriggerRollback) CheckPrivileges(ctx *sql.Context, opChecker sql.PrivilegedOperationChecker) bool {
-	return t.Child.CheckPrivileges(ctx, opChecker)
-}
-
-// CollationCoercibility implements the interface sql.CollationCoercible.
-func (t *TriggerRollback) CollationCoercibility(ctx *sql.Context) (collation sql.CollationID, coercibility byte) {
-	return sql.GetCoercibility(ctx, t.Child)
-}
-
-func (t *TriggerRollback) IsReadOnly() bool {
-	return t.Child.IsReadOnly()
-}
-
-func (t *TriggerRollback) String() string {
-	pr := sql.NewTreePrinter()
-	_ = pr.WriteNode("TriggerRollback()")
-	_ = pr.WriteChildren(t.Child.String())
-	return pr.String()
-}
-
-func (t *TriggerRollback) DebugString() string {
-	pr := sql.NewTreePrinter()
-	_ = pr.WriteNode("TriggerRollback")
-	_ = pr.WriteChildren(sql.DebugString(t.Child))
-	return pr.String()
-}
-
-type NoopTriggerRollback struct {
-	UnaryNode
-}
-
-var _ sql.Node = (*NoopTriggerRollback)(nil)
-var _ sql.CollationCoercible = (*NoopTriggerRollback)(nil)
-
-func NewNoopTriggerRollback(child sql.Node) *NoopTriggerRollback {
-	return &NoopTriggerRollback{
-		UnaryNode: UnaryNode{Child: child},
-	}
-}
-
-func (t *NoopTriggerRollback) WithChildren(children ...sql.Node) (sql.Node, error) {
-	if len(children) != 1 {
-		return nil, sql.ErrInvalidChildrenNumber.New(t, len(children), 1)
-	}
-
-	return NewNoopTriggerRollback(children[0]), nil
-}
-
-// CheckPrivileges implements the interface sql.Node.
-func (t *NoopTriggerRollback) CheckPrivileges(ctx *sql.Context, opChecker sql.PrivilegedOperationChecker) bool {
-	return t.Child.CheckPrivileges(ctx, opChecker)
-}
-
-// CollationCoercibility implements the interface sql.CollationCoercible.
-func (t *NoopTriggerRollback) CollationCoercibility(ctx *sql.Context) (collation sql.CollationID, coercibility byte) {
-	return sql.GetCoercibility(ctx, t.Child)
-}
-
-func (t *NoopTriggerRollback) IsReadOnly() bool {
-	return true
-}
-
-func (t *NoopTriggerRollback) String() string {
-	pr := sql.NewTreePrinter()
-	_ = pr.WriteNode("TriggerRollback()")
-	_ = pr.WriteChildren(t.Child.String())
-	return pr.String()
-}
-
-func (t *NoopTriggerRollback) DebugString() string {
-	pr := sql.NewTreePrinter()
-	_ = pr.WriteNode("TriggerRollback")
-	_ = pr.WriteChildren(sql.DebugString(t.Child))
-	return pr.String()
-}
+}

sql/plan/trigger.go

@@ -32,7 +32,6 @@ type ExecBuilderFunc func(ctx *sql.Context, n sql.Node, r sql.Row) (sql.RowIter,
 type BaseBuilder struct {
 	// if override is provided, we try to build executor with this first
 	override                sql.NodeExecBuilder
-	triggerSavePointCounter int // tracks the number of save points that have been created by triggers
 }
 
 func (b *BaseBuilder) Build(ctx *sql.Context, n sql.Node, r sql.Row) (sql.RowIter, error) {

sql/rowexec/builder.go

@@ -256,32 +256,6 @@ func (b *BaseBuilder) buildDropTable(ctx *sql.Context, n *plan.DropTable, row sq
 	return rowIterWithOkResultWithZeroRowsAffected(), nil
 }
 
-func (b *BaseBuilder) buildTriggerRollback(ctx *sql.Context, n *plan.TriggerRollback, row sql.Row) (sql.RowIter, error) {
-	childIter, err := b.buildNodeExec(ctx, n.Child, row)
-	if err != nil {
-		return nil, err
-	}
-
-	savePointCounter := b.triggerSavePointCounter + 1
-	savePointName := fmt.Sprintf("%s%v", TriggerSavePointPrefix, savePointCounter)
-	ctx.GetLogger().Tracef("TriggerRollback creating savepoint: %s", savePointName)
-
-	ts, ok := ctx.Session.(sql.TransactionSession)
-	if !ok {
-		return nil, fmt.Errorf("expected a sql.TransactionSession, but got %T", ctx.Session)
-	}
-
-	if err := ts.CreateSavepoint(ctx, ctx.GetTransaction(), savePointName); err != nil {
-		ctx.GetLogger().WithError(err).Errorf("CreateSavepoint failed")
-	}
-	b.triggerSavePointCounter = savePointCounter
-
-	return &triggerRollbackIter{
-		child:         childIter,
-		savePointName: savePointName,
-	}, nil
-}
-
 func (b *BaseBuilder) buildAlterIndex(ctx *sql.Context, n *plan.AlterIndex, row sql.Row) (sql.RowIter, error) {
 	err := b.executeAlterIndex(ctx, n)
 	if err != nil {

sql/rowexec/dml.go

@@ -33,6 +33,47 @@ type triggerRollbackIter struct {
 	savePointName string
 }
 
+func containsTrigger(node sql.Node) bool {
+	// Check if tree contains a TriggerExecutor
+	hasTrigger := false
+	transform.Inspect(node, func(n sql.Node) bool {
+		switch nn := n.(type) {
+		case *plan.TriggerExecutor:
+			hasTrigger = true
+			return false
+		case *plan.InsertInto:
+			// Before Triggers on Inserts are inside Source
+			if _, ok := nn.Source.(*plan.TriggerExecutor); ok {
+				hasTrigger = true
+				return false
+			}
+		}
+		return true
+	})
+	return hasTrigger
+}
+
+func AddTriggerRollbackIter(ctx *sql.Context, node sql.Node, iter sql.RowIter) sql.RowIter {
+	if !containsTrigger(node) {
+		return iter
+	}
+
+	transSess, isTransSess := ctx.Session.(sql.TransactionSession)
+	if !isTransSess {
+		return iter
+	}
+
+	ctx.GetLogger().Tracef("TriggerRollback creating savepoint: %s", TriggerSavePointPrefix)
+	if err := transSess.CreateSavepoint(ctx, ctx.GetTransaction(), TriggerSavePointPrefix); err != nil {
+		ctx.GetLogger().WithError(err).Errorf("CreateSavepoint failed")
+	}
+
+	return &triggerRollbackIter{
+		child:         iter,
+		savePointName: TriggerSavePointPrefix,
+	}
+}
+
 func (t *triggerRollbackIter) Next(ctx *sql.Context) (row sql.Row, returnErr error) {
 	childRow, err := t.child.Next(ctx)
 

sql/rowexec/dml_iters.go

@@ -150,8 +150,6 @@ func (b *BaseBuilder) buildNodeExecNoAnalyze(ctx *sql.Context, n sql.Node, row s
 		return b.buildHaving(ctx, n, row)
 	case *plan.Signal:
 		return b.buildSignal(ctx, n, row)
-	case *plan.TriggerRollback:
-		return b.buildTriggerRollback(ctx, n, row)
 	case *plan.ExternalProcedure:
 		return b.buildExternalProcedure(ctx, n, row)
 	case *plan.Into:
@@ -246,8 +244,6 @@ func (b *BaseBuilder) buildNodeExecNoAnalyze(ctx *sql.Context, n sql.Node, row s
 		return b.buildCreateIndex(ctx, n, row)
 	case *plan.Procedure:
 		return b.buildProcedure(ctx, n, row)
-	case *plan.NoopTriggerRollback:
-		return b.buildNoopTriggerRollback(ctx, n, row)
 	case *plan.With:
 		return b.buildWith(ctx, n, row)
 	case *plan.Project: