enh(query): increase the validity check of function parameters

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;
 }