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MDEV-13097 Online alter of a partitioned MyISAM table with auto_incre…
…ment MyISAM only allows online alter if autoincrement didn't change. MyISAM detects that by comparing new autoinc value from create_info, with the old one, stored in MYI. But in partitioned tables, create_info->auto_increment_value is for the whole table, max of autoinc values of individual MYI partitions. So *some* MYI partitions will inevitably think that alter table changes auto_increment value and will deny online alter. Fix: only compare autoinc values, if the user has used AUTO_INCREMENT in the ALTER TABLE statement.
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