Hi, Alexey! On Dec 18, Alexey Botchkov wrote:

revision-id: 203a6585d3deedb36e30d5ebf388de44b6810403 (mariadb-10.1.23-51-g203a658) parent(s): e4d10e09cf318aad237143254c45458d16009f70 committer: Alexey Botchkov timestamp: 2017-12-18 19:31:26 +0400 message:

MDEV-11084 Select statement with partition selection against MyISAM table opens all partitions.

Now SELECT FROM t PARTITION(x) only opens the 'x' file. The table->partition_names parameter is sent to ha_open so it only opens the required partitions. If the table is reopened, the change_partition_to_open(partition_names) is called that closes and opens partitions specified for the query.

Looks ok to me, thanks! Please add some tests, can status variables show the difference in the number of opened partitions? And make sure that the whole tree compiles without partitioning. Then ok to push into 10.3 Regards, Sergei Chief Architect MariaDB and security@mariadb.org