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Re: wip: functions median and percentile

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com>
Cc: Hitoshi Harada <umi(dot)tanuki(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Greg Stark <gsstark(at)mit(dot)edu>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, David Fetter <david(at)fetter(dot)org>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: wip: functions median and percentile
Date: 2010-10-11 17:48:12
Message-ID: 26782.1286819292@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-rrreviewers
Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> writes:
> On 11 October 2010 18:37, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> Sure it would: an estimate of 30K would keep the planner from using
>> hash aggregation.

> Not if work_mem was 10MB.

And?  If the memory requirement actually fits, you're in good shape.

			regards, tom lane

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