* Fixed a bug that relation ids which are the keys for the relation statistics cache was mistakenly treated as strings. This causes a false match between oids having a intermediate 0x00 byte and identical lower bytes (for the little endian case). Returning the wrong statistics cache can result in server crash, or at least unexpected plans.
* Lock granurality for pg_dbms_stats's operations was raised. Simultaneous lock operations on different tables no longer block each other.