在查询语句中使用case when语句时，当case when语句中有子查询时，case字段后面的字段，无论发生什么错误，报错信息都会为ERROR 1105 (HY000): errCode = 2, detailMessage = Only support subquery in binary predicate in case statement.
如果将case when语句中有子查询的sql作为子查询关联表时，无论该子查询外的sql有什么错误，报错信息都会为ERROR 1105 (HY000): errCode = 2, detailMessage = Only support subquery in binary predicate in case statement.
有如下表结构的两张表
CREATE TABLE int_mkt_chan_gridtlab_doris_hhgk_d (
CHANNEL_ID BIGINT NOT NULL,
CHANNEL_NAME VARCHAR NULL,
SOURCE_FLAG BIGINT NULL
);
CREATE TABLE szqtest (
channel_id BIGINT NULL,
is_pz TINYINT NULL
);
执行如下语句：
select a.channel_id,
case
when a.source_flag in (select channel_id from szqtest) then 'sp'
else 'yxt'
end ff,
abc
from int_mkt_chan_gridtlab_doris_hhgk_d a
正常来说应该报错信息应该为：detailMessage = Unknown column 'abc' in 'table list'.
但是实际报错信息为：detailMessage = Only support subquery in binary predicate in case statement.
