diff --git a/internal/topo/planner/util.go b/internal/topo/planner/util.go
index 5814d943be..5628358c14 100644
--- a/internal/topo/planner/util.go
+++ b/internal/topo/planner/util.go
@@ -63,6 +63,7 @@ func getFields(node ast.Node) []ast.Expr {
 	ast.WalkFunc(node, func(n ast.Node) bool {
 		switch t := n.(type) {
 		case *ast.FieldRef:
+			conf.Log.Infof("getFields fieldRef, field:%v, isColumn:%v", t.String(), t.IsColumn())
 			if t.IsColumn() {
 				result = append(result, t)
 			}