| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Peter Eisentraut <peter_e(at)gmx(dot)net>, pgsql-bugs(at)postgresql(dot)org, Mikael Krantz <mk(at)zigamorph(dot)se>, Jan-Ivar Mellingen <jan-ivar(dot)mellingen(at)alreg(dot)no> |
| Subject: | Re: Huge speed penalty using <>TRUE instead of =FALSE |
| Date: | 2009-08-10 15:10:02 |
| Message-ID: | 2279.1249917002@sss.pgh.pa.us |
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| Lists: | pgsql-bugs |
Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> On Fri, Jul 17, 2009 at 10:21 AM, Tom Lane<tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> Actually, now that I think about it, the planner already has
>> datatype-specific knowledge about boolean equality (see
>> simplify_boolean_equality). It would take just a few more lines of code
>> there to recognize "x <> true" and "x <> false" as additional variant
>> spellings of the generic "x" or "NOT x" constructs. Not sure if it's
>> worth the trouble though; how many people really write such things?
> I don't know, but there's probably somebody. I probably did it myself
> a few times, when I was just starting out. If it's easy, it seems
> worth doing.
http://archives.postgresql.org/pgsql-committers/2009-07/msg00164.php
regards, tom lane
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