SET DEBUG_DBUG = '+d,innodb_OOM_prepare_inplace_alter';
ALTER TABLE t1 ADD UNIQUE INDEX(c2);
ERROR HY000: Out of memory; check if mysqld or some other process uses all available memory; if not, you may have to use 'ulimit' to allow mysqld to use more memory or you can add more swap space
ERROR HY000: Out of memory.
SET DEBUG_DBUG = @saved_debug_dbug;
SET DEBUG_DBUG = '+d,innodb_OOM_inplace_alter';
CREATE UNIQUE INDEX c2 ON t1(c2);
ERROR HY000: Out of memory; check if mysqld or some other process uses all available memory; if not, you may have to use 'ulimit' to allow mysqld to use more memory or you can add more swap space