0002 - WIP patch to avoid repeated translations of RestrictInfo. The WIP patch avoids repeated translations by tracking the child for which a RestrictInfo is translated and reusing the same translation every time it is requested. In order to track the translations, RestrictInfo gets two new members. 1. parent_rinfo - In a child's RestrictInfo this points to the RestrictInfo applicable to the topmost parent in partition hierarchy. This is NULL in the topmost parent's RestrictInfo 2. child_rinfos - In a parent's RestrictInfo, this is a list that contains all the translated child RestrictInfos. In child RestrictInfos this is NULL.
I haven't looked into the details but with 0002 patch I came across a crash while planning the query below.
regression=# set enable_partitionwise_join to on; SET regression=# EXPLAIN (COSTS OFF) SELECT * FROM prt1 t1, prt2 t2 WHERE t1.a = t2.b AND t1.a < 450 AND t2.b > 250 AND t1.b = 0; server closed the connection unexpectedly
