MDEV-36493 Atomic CREATE OR REPLACE ... SELECT blocks InnoDB purge

[Thirunarayanan]

dict_table_t::parse_tbl_name() : Extracts database and table components from full table names

ddl_log_acquire_mdl(): Does take MDL on given table

• DELETE/REPLACE: single table MDL acquisition
• RENAME: source and destination table MDL protection
• ALTER: comprehensive MDL on original, intermediate and final tables
• EXCHANGE: primary, source, and temporary table MDL coverage

MDL acquistion on temporary tables in mysql_alter_table(), crash recovery for DDL log entry.

innodb_mdl_acquire() for temporary tables in
commit_inplace_alter_table()

innodb_mdl_check() to check MDL ownership verifiction in rename_table() and delete_table(). In innodb_rename_table(), it does check for source and destination table MDL check

• InnoDB purge thread now takes MDL on table name directly instead of relying on mdl_name

[CLAassistant]

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