diff --git a/source/dnode/vnode/src/tsdb/tsdbCache.c b/source/dnode/vnode/src/tsdb/tsdbCache.c
index b5624db51c..f67a5cc444 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCache.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCache.c
@@ -1181,7 +1181,7 @@ static int32_t mergeLastRow(tb_uid_t uid, STsdb *pTsdb, bool *dup, SArray **ppCo
 
   // build the result ts row here
   *dup = false;
-  if (taosArrayGetSize(pColArray) == nCol) {
+  if (taosArrayGetSize(pColArray) != nCol) {
     *ppColArray = NULL;
     taosArrayDestroy(pColArray);
   } else {