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

On Tue, 31 Oct 2023 at 10:48, Ashutosh Bapat
<ashutosh(dot)bapat(dot)oss(at)gmail(dot)com> wrote:
>
> On Thu, Sep 14, 2023 at 4:39 PM Ashutosh Bapat
> <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com> wrote:
> >
> > The patch set is thus
> > 0001 - patch used to measure memory used during planning
> >
> > 0002 - Patch to free intermediate Relids computed by
> > adjust_child_relids_multilevel(). I didn't test memory consumption for
> > multi-level partitioning. But this is clear improvement. In that
> > function we free the AppendInfos array which as many pointers long as
> > the number of relids. So it doesn't make sense not to free the Relids
> > which can be {largest relid}/8 bytes long at least.
> >
> > 0003 - patch to save and reuse commuted RestrictInfo. This patch by
> > itself shows a small memory saving (3%) in the query below where the
> > same clause is commuted twice. The query does not contain any
> > partitioned tables.
> > create table t2 (a int primary key, b int, c int);
> > create index t2_a_b on t2(a, b);
> > select * from t2 where 10 = a
> > Memory used without patch: 13696 bytes
> > Memory used with patch: 13264 bytes
> >
> > 0004 - Patch which implements the hash table of hash table described
> > above and also code to avoid repeated RestrictInfo list translations.
> >
> > I will add this patchset to next commitfest.
> >
> > --
> > Best Wishes,
> > Ashutosh Bapat
>
> PFA rebased patches. Nothing changes in 0002, 0003 and 0004. 0001 is
> the squashed version of the latest patch set at
> https://www.postgresql.org/message-id/CAExHW5sCJX7696sF-OnugAiaXS=Ag95=-m1cSrjcmyYj8Pduuw@mail.gmail.com.

CFBot shows that the patch does not apply anymore as in [1]:
=== Applying patches on top of PostgreSQL commit ID
7014c9a4bba2d1b67d60687afb5b2091c1d07f73 ===
=== applying patch
./0001-Report-memory-used-for-planning-a-query-in--20231031.patch
...
patching file src/test/regress/expected/explain.out
Hunk #5 FAILED at 290.
Hunk #6 succeeded at 545 (offset 4 lines).
1 out of 6 hunks FAILED -- saving rejects to file
src/test/regress/expected/explain.out.rej
patching file src/tools/pgindent/typedefs.list
Hunk #1 succeeded at 1562 (offset 18 lines).

Please post an updated version for the same.

[1] - http://cfbot.cputube.org/patch_46_4564.log

Regards,
Vignesh