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In the scope of MDEV-318, ALTER TABLE was extended to allow IF [NOT] EXISTS clauses, including those for MODIFY COLUMN and CHANGE COLUMN. However, ALTER COLUMN does not accept it:
MariaDB [test]> create table t1 (i int);
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Query OK, 0 rows affected (0.26 sec)
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MariaDB [test]> alter table t1 change column if exists a b int;
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Query OK, 0 rows affected, 1 warning (0.00 sec)
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Records: 0 Duplicates: 0 Warnings: 1
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MariaDB [test]> alter table t1 alter column if exists a set default 1;
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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 a set default 1' at line 1
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MariaDB [test]> select @@version;
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+-----------------------+
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| @@version |
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+-----------------------+
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| 10.0.34-MariaDB-debug |
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+-----------------------+
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1 row in set (0.00 sec)
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The task doesn't say anything about it being left out intentionally, so I suppose it's an omission.
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