From e07c30be1cd855d65fd2fa0a69b9b19809c2bf2d Mon Sep 17 00:00:00 2001
From: Haojun Liao <hjliao@taosdata.com>
Date: Wed, 4 Jan 2023 00:49:38 +0800
Subject: [PATCH] fix(query): clear the length before append var data.

---
 source/libs/executor/src/executorimpl.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/source/libs/executor/src/executorimpl.c b/source/libs/executor/src/executorimpl.c
index 3803bd8b01..2e8611c7dd 100644
--- a/source/libs/executor/src/executorimpl.c
+++ b/source/libs/executor/src/executorimpl.c
@@ -871,6 +871,8 @@ void extractQualifiedTupleByFilterResult(SSDataBlock* pBlock, const SColumnInfoD
 
       if (IS_VAR_DATA_TYPE(pDst->info.type)) {
         int32_t j = 0;
+        pDst->varmeta.length = 0;
+
         while(j < totalRows) {
           if (pIndicator[j] == 0) {
             continue;