Since the MCR refactor of the Mediawiki database schema has been progressing (https://phabricator.wikimedia.org/T166733 <https://phabricator.wikimedia.org/T166732> and many other tickets), one of the last steps is dropping the columns from the wiki replica schema.
The column drops are being tracked and are explained well here https://phabricator.wikimedia.org/T212972 <https://phabricator.wikimedia.org/T212972>, and currently the change is ready to be applied. It is already applied to two wikis (eswiki and huwiki since there was a column problem that needed fixing). The tables with names such as <tablename>_compat will retain a similar structure if that is needed for refactoring. From the ticket, this is a summary of what is changing, organized by table name: archive: Remove ar_comment archive_userindex: Remove ar_comment filearchive: Remove fa_deleted_reason Remove fa_description filearchive_userindex: Remove fa_deleted_reason Remove fa_description image: Remove img_description ipblocks: Remove ipb_reason. ipblocks_ipindex: Remove ipb_reason. logging: Remove log_comment. logging_logindex: Remove log_comment. logging_userindex: Remove log_comment. oldimage: Remove oi_description oldimage_userindex: Remove oi_description recentchanges: Remove rc_comment. recentchanges_userindex: Remove rc_comment. revision: Remove rev_comment. revision_userindex: Remove rev_comment. The changes to the _compat tables should not affect anything. We will deploy the change early next week (Tuesday - 3/12/2019). In most cases, if a table isn’t working for your tool or app anymore because of the change, you can switch to a table named $tablename_compat and it will appear to have the same schema, but it is recommended that comment references use a join to the new comment table on a “comment_id” field instead where possible. Brooke Storm Operations Engineer Wikimedia Cloud Services bst...@wikimedia.org <mailto:bst...@wikimedia.org> IRC: bstorm_
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