SQL_MODE not considered for VIEWs

[mjonss]

Bug Report

Please answer these questions before submitting your issue. Thanks!

SQL_MODE is not used properly in views, like ONLY_FULL_GROUP_BY is not in effect.

See test case, where no warning is given for TiDB, while it is given for MySQL.

1. Minimal reproduce step (Required)

create table t (a int);
set @@sql_mode = default;
create view v as select * from t group by null;
select * from v;
set @@sql_mode = '';
select * from v;

2. What did you expect to see? (Required)

mysql> create table t (a int);
Query OK, 0 rows affected (0,02 sec)

mysql> set @@sql_mode = default;
Query OK, 0 rows affected (0,00 sec)

mysql> create view v as select * from t group by null;
Query OK, 0 rows affected (0,00 sec)

mysql> select * from v;
ERROR 1055 (42000): Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'test.t.a' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
mysql> set @@sql_mode = '';
Query OK, 0 rows affected (0,00 sec)

mysql> select * from v;
Empty set (0,00 sec)

3. What did you see instead (Required)

tidb> create table t (a int);
Query OK, 0 rows affected (0.08 sec)

tidb> set @@sql_mode = default;
Query OK, 0 rows affected (0.00 sec)

tidb> create view v as select * from t group by null;
Query OK, 0 rows affected (0.10 sec)

tidb> select * from v;
Empty set (0.00 sec)

tidb> set @@sql_mode = '';
Query OK, 0 rows affected (0.01 sec)

tidb> select * from v;
Empty set (0.01 sec)

4. What is your TiDB version? (Required)

tidb_version(): Release Version: v8.0.0
Edition: Community
Git Commit Hash: 8ba1fa452b1ccdbfb85879ea94b9254aabba2916
Git Branch: HEAD
UTC Build Time: 2024-03-28 14:22:34
GoVersion: go1.21.6
Race Enabled: false
Check Table Before Drop: false
Store: tikv

[mjonss]

Related bugs:

• Selecting from a view returns inconsistent results #22767
• Unexpected Results by MERGE_JOIN #46564
• Unexpected Slow Query and Result by INL_JOIN #46600
• Unexpected Result by REGEXP #49107