| From: | David Rowley <david(dot)rowley(at)2ndquadrant(dot)com> |
|---|---|
| To: | "Finnerty, Jim" <jfinnert(at)amazon(dot)com> |
| Cc: | Stephen Frost <sfrost(at)snowman(dot)net>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Removing useless DISTINCT clauses |
| Date: | 2018-08-27 05:24:06 |
| Message-ID: | CAKJS1f9GxhaP_6pa=DsNEbXw1dJVPQ7scZ9qhg7+P2w4yXSpHg@mail.gmail.com |
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On 25 August 2018 at 04:05, Finnerty, Jim <jfinnert(at)amazon(dot)com> wrote:
> I'll explore a proper way to test that it's in the single-relation case, and will post a separate thread for the 'remove unnecessary DISTINCT' optimization.
See: has_multiple_baserels() in allpaths.c
--
David Rowley http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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