diff --git a/source/dnode/vnode/src/tsdb/tsdbRead.c b/source/dnode/vnode/src/tsdb/tsdbRead.c
index 84bc6e66ad..78393b4582 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead.c
@@ -2828,6 +2828,11 @@ static bool loadDataBlockFromTableSeq(STsdbReadHandle* pTsdbReadHandle) {
 bool tsdbNextDataBlock(tsdbReaderT pHandle) {
   STsdbReadHandle* pTsdbReadHandle = (STsdbReadHandle*) pHandle;
 
+  for(int32_t i = 0; i < taosArrayGetSize(pTsdbReadHandle->pColumns); ++i) {
+    SColumnInfoData* pColInfo = taosArrayGet(pTsdbReadHandle->pColumns, i);
+    colInfoDataCleanup(pColInfo, pTsdbReadHandle->outputCapacity);
+  }
+
   if (emptyQueryTimewindow(pTsdbReadHandle)) {
     tsdbDebug("%p query window not overlaps with the data set, no result returned, %s", pTsdbReadHandle, pTsdbReadHandle->idStr);
     return false;
@@ -3253,12 +3258,6 @@ SArray* tsdbRetrieveDataBlock(tsdbReaderT* pTsdbReadHandle, SArray* pIdList) {
    * 1. data is from cache, 2. data block is not completed qualified to query time range
    */
   STsdbReadHandle* pHandle = (STsdbReadHandle*)pTsdbReadHandle;
-
-  for(int32_t i = 0; i < taosArrayGetSize(pHandle->pColumns); ++i) {
-    SColumnInfoData* pColInfo = taosArrayGet(pHandle->pColumns, i);
-    colInfoDataCleanup(pColInfo, pHandle->outputCapacity);
-  }
-
   if (pHandle->cur.fid == INT32_MIN) {
     return pHandle->pColumns;
   } else {
diff --git a/tests/script/tsim/insert/backquote.sim b/tests/script/tsim/insert/backquote.sim
index 0c8b3df4af..71f35fabb2 100644
--- a/tests/script/tsim/insert/backquote.sim
+++ b/tests/script/tsim/insert/backquote.sim
@@ -83,7 +83,7 @@ while $dbCnt < 2
 
     print =============== query data
     sql select * from `table`
-    print rows: $rows 
+    print rows: $rows
     print $data00 $data01 $data02 $data03
     print $data10 $data11 $data12 $data13
     if $rows != 2 then 
@@ -99,7 +99,9 @@ while $dbCnt < 2
       print expect table, actual $data03
       return -1
     endi
-    
+
+
+    print =================> 1
     sql select * from `Table`
     print rows: $rows 
     print $data00 $data01 $data02 $data03
@@ -116,7 +118,8 @@ while $dbCnt < 2
     if $data03 != Table then 
       return -1
     endi
-    
+
+    print ================>2
     sql select * from `TAble`
     print rows: $rows 
     print $data00 $data01 $data02 $data03