From 08bbfb0d634a6c1c191eb83d50edd117b070d545 Mon Sep 17 00:00:00 2001
From: totaj <totaj@qq.com>
Date: Thu, 19 Oct 2023 15:58:23 +0800
Subject: [PATCH] Fix only full group bug.

---
 src/gausskernel/storage/access/common/heaptuple.cpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/gausskernel/storage/access/common/heaptuple.cpp b/src/gausskernel/storage/access/common/heaptuple.cpp
index dbe468d82..f30fddc45 100644
--- a/src/gausskernel/storage/access/common/heaptuple.cpp
+++ b/src/gausskernel/storage/access/common/heaptuple.cpp
@@ -1577,8 +1577,13 @@ Datum heap_slot_getattr(TupleTableSlot *slot, int attnum, bool *isnull, bool nee
      */
     /* internal error */
     if (tuple == NULL) {
-        ereport(ERROR,
-                (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("cannot extract attribute from empty tuple slot")));
+        /* tuple is null, now only happen in B mode, with sql_mode_full_group trun off. set all isnull to true */
+        int rc = memset_s(slot->tts_isnull, slot->tts_tupleDescriptor->natts * sizeof(bool),
+            true, slot->tts_tupleDescriptor->natts * sizeof(bool));
+        securec_check(rc, "\0", "\0");
+        slot->tts_nvalid = slot->tts_tupleDescriptor->natts;
+        *isnull = true;
+        return (Datum) 0;
     }
 
     /*