Patch 32 parts per key

MySQL supports 16 key parts per key. MariaDB supports 32 key parts per key. This patch allows MySQL to support 32 key parts like MariaDB. With TokuDB clustering keys, however, this patch is probably not necessary. In fact, we will only support this patch on MySQL 5.5. MySQL 5.6 (and beyond) will use the default number of key parts per key.

MySQL 5.5 - 16 key parts per key without the patch, 32 with the patch.

MySQL 5.6, Percona Server 5.6 - 16 key parts per key, no patch made.

MariaDB 5.5, MariaDB 10 - 32 key parts per key supported without any patches.