Aleksey Midenkov c6207ecba4 MDEV-25803 innodb.alter_candidate_key fix ...

There is a case when implicit primary key may be changed when removing
NOT NULL from the part of unique key. In that case we update
modified_primary_key which is then used to not skip key sorting.

According to is_candidate_key() there is no other cases when primary
kay may be changed implicitly.

2021-11-02 04:52:03 +03:00

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