MariaDB server is a community developed fork of MySQL server. Started by core members of the original MySQL team, MariaDB actively works with outside developers to deliver the most featureful, stable, and sanely licensed open SQL server in the industry.
row_upd_index_is_referenced(), row_upd_check_references_constraints(),
row_purge_parse_undo_rec(): Remove duplicated code that calls
row_mysql_unfreeze_data_dictionary().
row_undo_ins_remove_clust_rec():
Assert that the data dictionary is X-latched. Do not attempt to re-latch
the data dictionary, because doing so introduces race conditions. This
re-latching was probably made unnecessary already in r1676, which keeps
the data dictionary X-latched in ha_innobase::add_index() for the complete
duration of the data dictionary operations.
row_undo_ins_parse_undo_rec(): Do not attempt to acquire the data dictionary
latch. The data dictionary should be already X-latched when a transaction
that modifies system tables is rolled back. This also holds in the rollback
during crash recovery: trx_rollback_active() will X-latch the data dictionary
when needed.
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