Re: Performance improvement for joins where outer side is unique
| От | Alexander Korotkov |
|---|---|
| Тема | Re: Performance improvement for joins where outer side is unique |
| Дата | |
| Msg-id | CAPpHfdviphQFjk-gaGZGGxLAyt=YuVdJLnntsxOKnU296s9u-Q@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: Performance improvement for joins where outer side is unique (David Rowley <dgrowleyml@gmail.com>) |
| Ответы |
Re: Performance improvement for joins where outer side is unique
(David Rowley <david.rowley@2ndquadrant.com>)
|
| Список | pgsql-hackers |
Hi!
On Sat, Mar 28, 2015 at 10:35 AM, David Rowley <dgrowleyml@gmail.com> wrote:
On 25 March 2015 at 01:11, Kyotaro HORIGUCHI <horiguchi.kyotaro@lab.ntt.co.jp> wrote:Hi, thanks for the new patch.
I made an additional shrink from your last one. Do you have a
look on the attached?Thanks, for looking again.I'm not too sure I like the idea of relying on join removals to mark the is_unique_join property.By explicitly doing it in mark_unique_joins we have the nice side effect of not having to re-check a relations unique properties after removing another relation, providing the relation was already marked as unique on the first pass.At Sun, 22 Mar 2015 19:42:21 +1300, David Rowley <dgrowleyml@gmail.com> wrote in <CAApHDvrKwMmTwkXfn4uazYZA9jQL1c7UwBjBtuwFR69rqLVKfA@mail.gmail.com>
> On 20 March 2015 at 21:11, David Rowley <dgrowleyml@gmail.com> wrote:
> >
> > I can continue working on your patch if you like? Or are you planning to
> > go further with it?
It's fine that you continue to work on this.
# Sorry for the hardly baked patch which had left many things alone:(
> I've been working on this more over the weekend and I've re-factored things
> to allow LEFT JOINs to be properly marked as unique.
> I've also made changes to re-add support for detecting the uniqueness of
> sub-queries.
I don't see the point of calling mark_unique_joins for every
iteration on join_info_list in remove_useless_joins.I've fixed this in the attached. I must have forgotten to put the test for LEFT JOINs here as I was still thinking that I might make a change to the code that converts unique semi joins to inner joins so that it just checks is_unique_join instead of calling relation_has_unique_index_for().
Patch doesn't apply to current master. Could you, please, rebase it?
patching file src/backend/commands/explain.c
Hunk #1 succeeded at 1193 (offset 42 lines).
patching file src/backend/executor/nodeHashjoin.c
patching file src/backend/executor/nodeMergejoin.c
patching file src/backend/executor/nodeNestloop.c
patching file src/backend/nodes/copyfuncs.c
Hunk #1 succeeded at 2026 (offset 82 lines).
patching file src/backend/nodes/equalfuncs.c
Hunk #1 succeeded at 837 (offset 39 lines).
patching file src/backend/nodes/outfuncs.c
Hunk #1 succeeded at 2010 (offset 62 lines).
patching file src/backend/optimizer/path/costsize.c
Hunk #1 succeeded at 1780 (offset 68 lines).
Hunk #2 succeeded at 1814 with fuzz 2 (offset 68 lines).
Hunk #3 succeeded at 1887 with fuzz 2 (offset 38 lines).
Hunk #4 succeeded at 2759 (offset 97 lines).
patching file src/backend/optimizer/path/joinpath.c
Hunk #1 succeeded at 19 with fuzz 2 (offset 1 line).
Hunk #2 FAILED at 30.
Hunk #3 succeeded at 46 (offset -5 lines).
Hunk #4 succeeded at 84 with fuzz 2 (offset -8 lines).
Hunk #5 FAILED at 241.
Hunk #6 FAILED at 254.
Hunk #7 FAILED at 284.
Hunk #8 FAILED at 299.
Hunk #9 succeeded at 373 with fuzz 2 (offset 4 lines).
Hunk #10 succeeded at 385 with fuzz 2 (offset 4 lines).
Hunk #11 FAILED at 411.
Hunk #12 succeeded at 470 with fuzz 2 (offset 1 line).
Hunk #13 FAILED at 498.
Hunk #14 succeeded at 543 with fuzz 2 (offset -3 lines).
Hunk #15 FAILED at 604.
Hunk #16 FAILED at 617.
Hunk #17 FAILED at 748.
Hunk #18 FAILED at 794.
Hunk #19 FAILED at 808.
Hunk #20 FAILED at 939.
Hunk #21 FAILED at 966.
Hunk #22 FAILED at 982.
Hunk #23 FAILED at 1040.
Hunk #24 FAILED at 1140.
Hunk #25 FAILED at 1187.
Hunk #26 FAILED at 1222.
Hunk #27 FAILED at 1235.
Hunk #28 FAILED at 1310.
Hunk #29 FAILED at 1331.
Hunk #30 FAILED at 1345.
Hunk #31 FAILED at 1371.
Hunk #32 FAILED at 1410.
25 out of 32 hunks FAILED -- saving rejects to file src/backend/optimizer/path/joinpath.c.rej
patching file src/backend/optimizer/path/joinrels.c
patching file src/backend/optimizer/plan/analyzejoins.c
patching file src/backend/optimizer/plan/createplan.c
Hunk #1 succeeded at 135 (offset 4 lines).
Hunk #2 succeeded at 155 (offset 4 lines).
Hunk #3 succeeded at 2304 (offset 113 lines).
Hunk #4 succeeded at 2598 (offset 113 lines).
Hunk #5 succeeded at 2724 (offset 113 lines).
Hunk #6 succeeded at 3855 (offset 139 lines).
Hunk #7 succeeded at 3865 (offset 139 lines).
Hunk #8 succeeded at 3880 (offset 139 lines).
Hunk #9 succeeded at 3891 (offset 139 lines).
Hunk #10 succeeded at 3941 (offset 139 lines).
Hunk #11 succeeded at 3956 (offset 139 lines).
patching file src/backend/optimizer/plan/initsplan.c
patching file src/backend/optimizer/plan/planmain.c
patching file src/backend/optimizer/util/pathnode.c
Hunk #1 succeeded at 1541 (offset 27 lines).
Hunk #2 succeeded at 1557 (offset 27 lines).
Hunk #3 succeeded at 1610 (offset 27 lines).
Hunk #4 succeeded at 1625 (offset 27 lines).
Hunk #5 succeeded at 1642 (offset 27 lines).
Hunk #6 succeeded at 1670 (offset 27 lines).
Hunk #7 succeeded at 1688 (offset 27 lines).
Hunk #8 succeeded at 1703 (offset 27 lines).
Hunk #9 succeeded at 1741 (offset 27 lines).
patching file src/include/nodes/execnodes.h
Hunk #1 succeeded at 1636 (offset 71 lines).
patching file src/include/nodes/plannodes.h
Hunk #1 succeeded at 586 (offset 43 lines).
patching file src/include/nodes/relation.h
Hunk #1 succeeded at 1045 (offset 14 lines).
Hunk #2 succeeded at 1422 (offset 14 lines).
patching file src/include/optimizer/cost.h
Hunk #1 succeeded at 114 (offset 1 line).
patching file src/include/optimizer/pathnode.h
Hunk #1 succeeded at 91 (offset 2 lines).
Hunk #2 succeeded at 104 (offset 2 lines).
Hunk #3 succeeded at 119 (offset 2 lines).
patching file src/include/optimizer/planmain.h
Hunk #1 succeeded at 124 (offset 2 lines).
patching file src/test/regress/expected/equivclass.out
patching file src/test/regress/expected/join.out
Hunk #1 succeeded at 2656 (offset 42 lines).
Hunk #2 succeeded at 3428 (offset 90 lines).
Hunk #3 succeeded at 4506 (offset 90 lines).
patching file src/test/regress/expected/rowsecurity.out
Hunk #1 succeeded at 274 (offset 26 lines).
patching file src/test/regress/expected/select_views.out
Hunk #1 succeeded at 1411 (offset 46 lines).
Hunk #2 succeeded at 1432 (offset 46 lines).
Hunk #3 succeeded at 1466 (offset 46 lines).
Hunk #4 succeeded at 1497 (offset 46 lines).
patching file src/test/regress/expected/select_views_1.out
Hunk #1 succeeded at 1411 (offset 46 lines).
Hunk #2 succeeded at 1432 (offset 46 lines).
Hunk #3 succeeded at 1466 (offset 46 lines).
Hunk #4 succeeded at 1497 (offset 46 lines).
patching file src/test/regress/sql/join.sql
Hunk #1 succeeded at 1344 (offset 37 lines).
The Russian Postgres Company
В списке pgsql-hackers по дате отправления: