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MDEV-28943 Online alter fails under LOCK TABLE with ER_ALTER_OPERATION_NOT_SUPPORTED_REASON

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if ALTER TABLE ... LOCK=xxx is executed under LOCK TABLES,
ignore the LOCK clause, because ALTER should not downgrade
already taken EXCLUSIVE table lock to SHARED or NONE.

This commit preserves the existing behavior (LOCK was de facto ignored),
but makes it explicit.
This commit is contained in:
Sergei Golubchik 2022-07-01 13:50:02 +02:00
commit 845c939601
3 changed files with 99 additions and 1 deletions
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4
sql/sql_table.cc
View file

@ -10029,7 +10029,6 @@ bool mysql_alter_table(THD *thd, const LEX_CSTRING *new_db,
if (alter_info->requested_lock == Alter_info::ALTER_TABLE_LOCK_SHARED
|| alter_info->requested_lock > Alter_info::ALTER_TABLE_LOCK_NONE
|| alter_info->flags & ALTER_DROP_SYSTEM_VERSIONING
|| thd->locked_tables_mode == LTM_LOCK_TABLES
|| thd->lex->sql_command == SQLCOM_OPTIMIZE
|| alter_info->algorithm(thd) > Alter_info::ALTER_TABLE_ALGORITHM_COPY)
online= false;
@ -10906,6 +10905,9 @@ do_continue:;
goto err_new_table_cleanup;
}
if (thd->locked_tables_mode == LTM_LOCK_TABLES)
online= false;
// If EXCLUSIVE lock is requested, upgrade already.
if (alter_info->requested_lock == Alter_info::ALTER_TABLE_LOCK_EXCLUSIVE &&
wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN))