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MDEV-15373 engine gtid_slave_pos table name disobeys lower-case-table…
…-names Replicated transaction extra gtid statement on slave failed to specify an engine gtid_slave_pos name correctly. In case lower-case-table-names > 0 the InnoDB table name was generated to reproduce the lower-case-table-names=0 version which is of mixed cases. In rpl.rpl_mdev12179 test run this triggered a failure to DROP table which was due to the innodb table handle was not closed: InnoDB: Waited XYZ seconds for ref-count on table: `mysql`.`gtid_slave_pos_innodb` on windows. The closing issue was caused by having the table registered twice in the table cache, for its lower- and mixed- case name versions. The DROP-table handler closed only only one of the cache item to leave the 2nd one active. (On Linux a failure occurs earlier at attempt to open an expected lower-cased table: Last_Error: Error during XID COMMIT: failed to update GTID state in mysql.gtid_slave_pos: 1146: Table 'mysql.gtid_slave_pos_InnoDB' doesn't exist but the table's name as the message shows is not in the right case). Fixed with consulting lower-case-table-names when the engine gtid-slave-pos table is created. Note the lower-case-table-names=a-value created table will not recognized when next the lower case option changes to a different value. In 10.4 a follow-up patch is going to lowercase gtid-slave-pos autocreated table at once at their origination, and a warning is issued in the 10.3 current patch.
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