From 6849ccd280f6c3d4a34bd9c008563ab3f352e885 Mon Sep 17 00:00:00 2001
From: slzhou <shenglian_zhou@163.com>
Date: Mon, 29 Jan 2024 11:02:38 +0800
Subject: [PATCH] fix: pre-allocated columns has no data

---
 source/libs/executor/src/mergejoinoperator.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/source/libs/executor/src/mergejoinoperator.c b/source/libs/executor/src/mergejoinoperator.c
index b4461f20b1..7f12d9d225 100644
--- a/source/libs/executor/src/mergejoinoperator.c
+++ b/source/libs/executor/src/mergejoinoperator.c
@@ -399,7 +399,9 @@ static void mergeJoinJoinLeftRight(struct SOperatorInfo* pOperator, SSDataBlock*
       colDataSetNULL(pDst, currRow);
     } else {
       char* p = colDataGetData(pSrc, rowIndex);
-      colDataSetVal(pDst, currRow, p, false);
+      if (p != NULL) {
+        colDataSetVal(pDst, currRow, p, false);
+      }
     }
   }
 }