From 39b41bc893ab3813a2706c0f002b2fef5e5bc5fd Mon Sep 17 00:00:00 2001
From: xianyu-w <707512433@qq.com>
Date: Wed, 5 Jul 2023 01:18:03 +0000
Subject: [PATCH] Fix subquery coalesce bug

---
 src/sql/rewrite/ob_transform_subquery_coalesce.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/sql/rewrite/ob_transform_subquery_coalesce.cpp b/src/sql/rewrite/ob_transform_subquery_coalesce.cpp
index cf323eb2a0..f915882639 100644
--- a/src/sql/rewrite/ob_transform_subquery_coalesce.cpp
+++ b/src/sql/rewrite/ob_transform_subquery_coalesce.cpp
@@ -439,6 +439,8 @@ int ObTransformSubqueryCoalesce::coalesce_same_any_all_exprs(ObDMLStmt *stmt,
                                                                   second_query_ref->get_ref_stmt(),
                                                                   map_info, relation))) {
           LOG_WARN("failed to check stmt containment", K(ret));
+        } else if (!map_info.is_select_item_equal_) {
+          OPT_TRACE("stmts have different select items, can not coalesce");
         } else if (relation == QUERY_LEFT_SUBSET || relation == QUERY_EQUAL) {
           remove_index = (type == T_ANY ? j : i);
           OPT_TRACE("right query contain left query, will coalesce suqbeury");