| From: | Peter Geoghegan <pg(at)bowt(dot)ie> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Alena Rybakina <a(dot)rybakina(at)postgrespro(dot)ru>, Alexander Korotkov <aekorotkov(at)gmail(dot)com>, jian he <jian(dot)universality(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org, Marcos Pegoraro <marcos(at)f10(dot)com(dot)br>, teodor(at)sigaev(dot)ru, Andrei Lepikhov <a(dot)lepikhov(at)postgrespro(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: | 2024-06-24 17:54:10 |
| Message-ID: | CAH2-WznZUP4dqkufZqP-U+=27Y--z_HfDorNsTKOcpZPyF0_Aw@mail.gmail.com |
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On Mon, Jun 24, 2024 at 1:46 PM Peter Geoghegan <pg(at)bowt(dot)ie> wrote:
> BTW, did you know MySQL has long supported the latter? It has a <=>
> operator, which is basically a non-standard spelling of IS NOT
> DISTINCT FROM. Importantly, it is indexable, whereas right now
> Postgres doesn't support indexing IS NOT DISTINCT FROM. If you're
> interested in working on this problem within the scope of this patch,
> or some follow-up patch, I can take care of the nbtree side of things.
To be clear, I meant that we could easily support "where mycol = 5 OR
mycol IS NULL" and have nbtree handle that efficiently, by making it a
SAOP internally. Separately, we could also make IS NOT DISTINCT FROM
indexable, though that probably wouldn't need any work in nbtree.
--
Peter Geoghegan
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