diff --git a/util/request_source.go b/util/request_source.go
index 663648771..6ebadfc7e 100644
--- a/util/request_source.go
+++ b/util/request_source.go
@@ -48,10 +48,11 @@ const (
 	ExplicitTypeBR         = "br"
 	ExplicitTypeDumpling   = "dumpling"
 	ExplicitTypeBackground = "background"
+	ExplicitTypeDDL        = "ddl"
 )
 
 // ExplicitTypeList is the list of all explicit source types.
-var ExplicitTypeList = []string{ExplicitTypeEmpty, ExplicitTypeLightning, ExplicitTypeBR, ExplicitTypeDumpling, ExplicitTypeBackground}
+var ExplicitTypeList = []string{ExplicitTypeEmpty, ExplicitTypeLightning, ExplicitTypeBR, ExplicitTypeDumpling, ExplicitTypeBackground, ExplicitTypeDDL}
 
 const (
 	// InternalRequest is the scope of internal queries
@@ -94,6 +95,15 @@ func WithInternalSourceType(ctx context.Context, source string) context.Context
 	})
 }
 
+// WithInternalSourceAndTaskType create context with internal source and task name.
+func WithInternalSourceAndTaskType(ctx context.Context, source, taskName string) context.Context {
+	return context.WithValue(ctx, RequestSourceKey, RequestSource{
+		RequestSourceInternal:     true,
+		RequestSourceType:         source,
+		ExplicitRequestSourceType: taskName,
+	})
+}
+
 // BuildRequestSource builds a request_source from internal, source and explicitSource.
 func BuildRequestSource(internal bool, source, explicitSource string) string {
 	requestSource := RequestSource{