diff --git a/source/libs/function/src/builtins.c b/source/libs/function/src/builtins.c
index 5dbd442c9542876540d7153448e67e2b764677c6..c212a7c7190c9e921e37d1bb3b2e3d7da93f9eaf 100644
--- a/source/libs/function/src/builtins.c
+++ b/source/libs/function/src/builtins.c
@@ -227,7 +227,7 @@ static int32_t translateLength(SFunctionNode* pFunc, char* pErrBuf, int32_t len)
     return invaildFuncParaTypeErrMsg(pErrBuf, len, pFunc->functionName);
   }
 
-  pFunc->node.resType = (SDataType) { .bytes = tDataTypes[TSDB_DATA_TYPE_INT].bytes, .type = TSDB_DATA_TYPE_INT };
+  pFunc->node.resType = (SDataType) { .bytes = tDataTypes[TSDB_DATA_TYPE_SMALLINT].bytes, .type = TSDB_DATA_TYPE_SMALLINT };
   return TSDB_CODE_SUCCESS;
 }