| From: | Alexander Korotkov <aekorotkov(at)gmail(dot)com> |
|---|---|
| To: | Alena Rybakina <a(dot)rybakina(at)postgrespro(dot)ru> |
| Cc: | Nikolay Shaplov <dhyan(at)nataraj(dot)su>, pgsql-hackers(at)lists(dot)postgresql(dot)org, Andrei Lepikhov <a(dot)lepikhov(at)postgrespro(dot)ru>, jian he <jian(dot)universality(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org, Peter Geoghegan <pg(at)bowt(dot)ie>, Marcos Pegoraro <marcos(at)f10(dot)com(dot)br>, teodor(at)sigaev(dot)ru, Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, Peter Eisentraut <peter(at)eisentraut(dot)org>, Ranier Vilela <ranier(dot)vf(at)gmail(dot)com> |
| Subject: | Re: POC, WIP: OR-clause support for indexes |
| Date: | 2024-07-22 00:54:43 |
| Message-ID: | CAPpHfdsp5mWaCS8BtcgPPnnD4LUfQQ1e_wOc3XPwi9ku6cGUrQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, Jul 22, 2024 at 3:52 AM Alexander Korotkov <aekorotkov(at)gmail(dot)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
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