From 2ae1933f11898e35833c0f4abdbd5a763a1aeb19 Mon Sep 17 00:00:00 2001
From: Arenatlx <314806019@qq.com>
Date: Thu, 28 Mar 2024 17:02:26 +0800
Subject: [PATCH] planner: fix hidden column may do not have a virtual
 expression (#52184)

close pingcap/tidb#52181
---
 pkg/expression/column.go        | 4 ++--
 pkg/table/tables/tables_test.go | 1 +
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/pkg/expression/column.go b/pkg/expression/column.go
index af95e1efc313e..5920f6b70f20b 100644
--- a/pkg/expression/column.go
+++ b/pkg/expression/column.go
@@ -390,8 +390,8 @@ const columnPrefix = "Column#"
 
 // String implements Stringer interface.
 func (col *Column) String() string {
-	if col.IsHidden {
-		// A hidden column must be a virtual generated column, we should output its expression.
+	if col.IsHidden && col.VirtualExpr != nil {
+		// A hidden column without virtual expression indicates it's a stored type.
 		return col.VirtualExpr.String()
 	}
 	if col.OrigName != "" {
diff --git a/pkg/table/tables/tables_test.go b/pkg/table/tables/tables_test.go
index 2deea74fc46c4..bd54bafbdac45 100644
--- a/pkg/table/tables/tables_test.go
+++ b/pkg/table/tables/tables_test.go
@@ -544,6 +544,7 @@ func TestHiddenColumn(t *testing.T) {
 	tk.MustGetErrMsg("update t set a=1 where c=3 order by b;", "[planner:1054]Unknown column 'b' in 'order clause'")
 
 	// `DELETE` statement
+	tk.MustQuery("trace plan delete from t;")
 	tk.MustExec("delete from t;")
 	tk.MustQuery("select count(*) from t;").Check(testkit.Rows("0"))
 	tk.MustExec("insert into t values (1, 3, 5);")