From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Gregory Stark <stark(at)enterprisedb(dot)com>, Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, "jd(at)commandprompt(dot)com" <jd(at)commandprompt(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com>, Greg Smith <gsmith(at)gregsmith(dot)com>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: benchmarking the query planner |
Date: | 2008-12-11 23:35:31 |
Message-ID: | 1229038531.13078.184.camel@hp_dx2400_1 |
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Lists: | pgsql-hackers |
On Thu, 2008-12-11 at 17:45 -0500, Tom Lane wrote:
> Simon Riggs <simon(at)2ndQuadrant(dot)com> writes:
> > I would like it even more if there was a data type specific default.
> > Currently we have a special case for boolean, but that's it.
>
> No, we don't (or if we do I'd be interested to know where).
Your commit, selfuncs.c, 7 Jul.
> I don't see
> much value in a data-type-dependent default anyway --- would you make
> different defaults for int4, int8, and float8, and on what grounds?
> The actual data contents of three such columns could easily be exactly
> equivalent.
I would prefer distinct type or domain specific defaults, but until we
have that I would settle for datatype specific defaults.
Defaults, not only permissible settings.
Most people don't keep same data in float8 as they do in int4, but
neither of those were ones I was thinking about. I see 3 main classes:
* data with small number of distinct values (e.g. boolean, smallint)
* data with many distinct values
* data with where every value is typically unique (e.g. text)
--
Simon Riggs www.2ndQuadrant.com
PostgreSQL Training, Services and Support
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