Type:
Bug
Priority:
Major
Resolution:
Fixed
Affects Version/s:
10.5
In MDEV-16290 , ALTER TABLE .. RENAME COLUMN was implemented. I think it should follow standard conventions and support IF EXISTS clause, as other column operations do:
10.5 a4ab54d7
MariaDB [test]> create table t (a int );
Query OK, 0 rows affected (0.214 sec)
MariaDB [test]> alter table t change column if exists a b int ;
Query OK, 0 rows affected (0.044 sec)
Records: 0 Duplicates: 0 Warnings: 0
MariaDB [test]> alter table t modify column if exists b char (8);
Query OK, 0 rows affected (0.292 sec)
Records: 0 Duplicates: 0 Warnings: 0
MariaDB [test]> alter table t add column if not exists a int ;
Query OK, 0 rows affected (0.040 sec)
Records: 0 Duplicates: 0 Warnings: 0
MariaDB [test]> alter table t drop column if exists a;
Query OK, 0 rows affected (0.089 sec)
Records: 0 Duplicates: 0 Warnings: 0
MariaDB [test]> alter table t rename column if exists b to c;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'if exists b to c' at line 1
Same for RENAME INDEX implemented in MDEV-7318 .
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OK to push