diff --git a/source/dnode/vnode/src/tsdb/tsdbRead.c b/source/dnode/vnode/src/tsdb/tsdbRead.c
index 4aca1ea228beb90330929f4939bee81bd2e2085a..6b71def573caf736c123b9e434fba0e235b3def0 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead.c
@@ -3522,6 +3522,8 @@ int32_t doMergeMemIMemRows(TSDBROW* pRow, TSDBROW* piRow, STableBlockScanInfo* p
   }
 
   int32_t code = tRowMergerGetRow(&merge, pTSRow);
+  tRowMergerClear(&merge);
+
   return code;
 }