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Re: Index usage when bitwise operator is used

From: "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
To: "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: "valgog" <valgog(at)gmail(dot)com>,<pgsql-performance(at)postgresql(dot)org>
Subject: Re: Index usage when bitwise operator is used
Date: 2007-09-17 14:30:26
Message-ID: 46EE4931.EE98.0025.0@wicourts.gov (view raw or flat)
Thread:
Lists: pgsql-performance
>>> On Mon, Sep 17, 2007 at  8:37 AM, in message <21403(dot)1190036229(at)sss(dot)pgh(dot)pa(dot)us>,
Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote: 
> "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov> writes:
>> On Mon, Sep 17, 2007 at  2:49 AM, in message
>> <1190015368(dot)148293(dot)56830(at)y42g2000hsy(dot)googlegroups(dot)com>, valgog
>> <valgog(at)gmail(dot)com> wrote:=20
>>> Are you sure you understood what was the question?
>>> 
>>> Is the TBL1.CATEGORY = TBL2.CATEGORY the same as TBL1.CATEGORY &
>>> TBL2.CATEGORY > 0?
> 
>> Yes, given that he stipulated that one and only one bit would be set.
> 
> Really?  In that case, isn't this bit-field just a bad implementation of
> an enum-style field?
 
My bad.  I did misread it.  Sorry, all.
 
-Kevin
 



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