Re: Performance improvement for joins where outer side is unique

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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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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