| From: | David Rowley <david(dot)rowley(at)2ndquadrant(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Performance improvement for joins where outer side is unique |
| Date: | 2017-01-26 12:54:38 |
| Message-ID: | CAKJS1f8Ci2pdR0Jnj9bkzNg5bVYHLGR55wG=cMLZ2vQG+bDRzA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On 27 January 2017 at 00:37, David Rowley <david(dot)rowley(at)2ndquadrant(dot)com> wrote:
> The attached has my Merge Join changes, to show what I think can be
> done to make use of unique outer. Let me know what you think, but I
> get that idea that we're both leaning towards ripping the outer unique
> stuff out, so I'll go do that now...
I've attached a version without outer unique.
--
David Rowley http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
| Attachment | Content-Type | Size |
|---|---|---|
| unique_joins_2017-01-27_no_outer_unique.patch | application/octet-stream | 73.9 KB |
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