BUG#18618561: FAILED ALTER TABLE ENGINE CHANGE WITH PARTITIONS
CORRUPTS FRM Analysis: --------- ALTER TABLE on a partitioned table resulted in the wrong engine being written into the table's FRM file and displayed in SHOW CREATE TABLE. The prep_alter_part_table() modifies the partition_info object for TABLE instance representing the old version of table. If the ALTER TABLE ENGINE statement fails, the partition_info object for the TABLE contains the altered storage engine name. The SHOW CREATE TABLE uses the TABLE object to display the table information, hence displays incorrect storage engine for the table. Also a subsequent successful ALTER TABLE operation will write the incorrect engine information into the FRM file. Fix: --- A copy of the partition_info object is created before modification so that any changes would not cause the the original partition_info object to be modified if the ALTER TABLE fails.(Backported part of the code provided as fix for bug#14156617 in mysql-5.6.6).
Showing
Please register or sign in to comment