Re: Reducing memory consumed by RestrictInfo list translations in partitionwise join planning

On Thu, Jul 27, 2023 at 10:06 PM Ashutosh Bapat <
ashutosh(dot)bapat(dot)oss(at)gmail(dot)com> wrote:

> 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

Thanks
Richard