mpp query hangs if TiFlash meet some error for complex sql

[windtalker]

mysql> show create table aa;
+-------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
+-------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| AA    | CREATE TABLE `AA` (
  `col_decimal_not_null` decimal(10,0) NOT NULL,
  `pk` int(11) NOT NULL AUTO_INCREMENT,
  `col_varchar_10` varchar(10) DEFAULT NULL,
  `col_datetime` datetime DEFAULT NULL,
  `col_decimal` decimal(10,0) DEFAULT NULL,
  `col_varchar_10_not_null` varchar(10) NOT NULL,
  `col_datetime_not_null` datetime NOT NULL,
  `col_int` int(11) DEFAULT NULL,
  `col_int_not_null` int(11) NOT NULL,
  PRIMARY KEY (`pk`) /*T![clustered_index] CLUSTERED */
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin AUTO_INCREMENT=2000001 |
+-------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

mysql> SELECT SUM( OUTR . col2 ) AS X FROM (SELECT INNR . `pk` + 1 as col1, INNR . `col_datetime` as col2 FROM AA AS INNR) AS OUTR2 INNER JOIN (SELECT INNR . `col_int` + 1 as col1, INNR . `col_varchar_10` as col2 FROM AA AS INNR) AS OUTR ON OUTR2.col1 = OUTR.col1 GROUP
BY OUTR . col2, OUTR2 . col1;
ERROR 1105 (HY000): DB::Exception: Illegal type String of argument for aggregate function sum

Seems the last sql will hangs forever unless I kill the tidb connection in another tidb session.