| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | pgsql-hackers(at)postgresql(dot)org, Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov> |
| Subject: | Re: Fixing Grittner's planner issues |
| Date: | 2009-02-19 19:56:05 |
| Message-ID: | 603c8f070902191156t19953f1ckef73b844ec2be6d9@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, Feb 19, 2009 at 2:54 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>> On Thu, Feb 19, 2009 at 1:20 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>>> [ back to planner stuff after a hiatus ]
>
>> Well, as I wrote upthread:
>
> What you're actually suggesting is modifying the executor to incorporate
> the unique-fication logic into hashjoin and/or mergejoin. Maybe, but
> that code is way too complex already for my taste (especially mergejoin)
> and what we'd save is, hmm, four lines in the planner.
What you'd save is planning time.
...Robert
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