MDEV-14585 Automatically remove #sql- tables in InnoDB dictionary during recovery
Now that MDEV-14717 made RENAME TABLE crash-safe within InnoDB, it should be safe to drop the #sql- tables within InnoDB during crash recovery. These tables can be one of two things: (1) #sql-ib related to deferred DROP TABLE (follow-up to MDEV-13407) or to table-rebuilding ALTER TABLE...ALGORITHM=INPLACE (since MDEV-14378, only related to the intermediate copy of a table), (2) #sql- related to the intermediate copy of a table during ALTER TABLE...ALGORITHM=COPY We will not drop tables whose name starts with #sql2, because the server can be killed during an ALGORITHM=COPY operation at a point where the original table was renamed to #sql2 but the finished intermediate copy was not yet renamed from #sql- to the original table name.
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