Horton

Re: POC, WIP: OR-clause support for indexes

Alexander Korotkov <aekorotkov@gmail.com>

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From: Alexander Korotkov <aekorotkov@gmail.com>
To: Alena Rybakina <a.rybakina@postgrespro.ru>
Cc: Nikolay Shaplov <dhyan@nataraj.su>, pgsql-hackers@lists.postgresql.org, Andrei Lepikhov <a.lepikhov@postgrespro.ru>, jian he <jian.universality@gmail.com>, Robert Haas <robertmhaas@gmail.com>, pgsql-hackers@postgresql.org, Peter Geoghegan <pg@bowt.ie>, Marcos Pegoraro <marcos@f10.com.br>, teodor@sigaev.ru, Tomas Vondra <tomas.vondra@enterprisedb.com>, Peter Eisentraut <peter@eisentraut.org>, Ranier Vilela <ranier.vf@gmail.com>
Date: 2024-07-22T00:54:43Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Make group_similar_or_args() reorder clause list as little as possible

  2. Allow usage of match_orclause_to_indexcol() for joins

  3. Skip not SOAP-supported indexes while transforming an OR clause into SAOP

  4. Remove the wrong assertion from match_orclause_to_indexcol()

  5. Teach bitmap path generation about transforming OR-clauses to SAOP's

  6. Transform OR-clauses to SAOP's during index matching

  7. Fix the value of or_to_any_transform_limit in postgresql.conf.sample

  8. Transform OR clauses to ANY expression

  9. MergeAttributes code deduplication

  10. SEARCH and CYCLE clauses

  11. Improve estimation of OR clauses using extended statistics.

  12. Teach btree to handle ScalarArrayOpExpr quals natively.

  13. Revise collation derivation method and expression-tree representation.

  14. Instead of trying to force WHERE clauses into CNF or DNF normal form,

On Mon, Jul 22, 2024 at 3:52 AM Alexander Korotkov <aekorotkov@gmail.com> wrote:
> Please, check that there is still possibility to the generate BitmapOr plan.
>
> # explain select * from t where (b = 1 or b = 2 or a = 2 or a = 3);
>                                      QUERY PLAN
> ------------------------------------------------------------------------------------
>  Bitmap Heap Scan on t  (cost=326.16..835.16 rows=14999 width=12)
>    Recheck Cond: ((b = 1) OR (b = 2) OR (a = 2) OR (a = 3))
>    ->  BitmapOr  (cost=326.16..326.16 rows=20000 width=0)
>          ->  Bitmap Index Scan on t_b_c_idx  (cost=0.00..151.29
> rows=10000 width=0)
>                Index Cond: (b = 1)
>          ->  Bitmap Index Scan on t_b_c_idx  (cost=0.00..151.29
> rows=10000 width=0)
>                Index Cond: (b = 2)
>          ->  Bitmap Index Scan on t_a_b_idx  (cost=0.00..4.29 rows=1 width=0)
>                Index Cond: (a = 2)
>          ->  Bitmap Index Scan on t_a_b_idx  (cost=0.00..4.29 rows=1 width=0)
>                Index Cond: (a = 3)

Forgot to mention that I have to
# set enable_seqscan = off;
to get this plan.

------
Regards,
Alexander Korotkov
Supabase