From: Tom Lane <tgl@sss.pgh.pa.us>
To: Kevin Grittner <Kevin.Grittner@wicourts.gov>
Cc: valgog <valgog@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Index usage when bitwise operator is used
Date: Mon, 17 Sep 2007 09:37:09 -0400
Message-ID: <21403.1190036229@sss.pgh.pa.us> (raw)
In-Reply-To: <46EE2C53.EE98.0025.0@wicourts.gov>
References: <f97d4e240709130530ve3cc522g61ccca23335618f4@mail.gmail.com>
<46ED7CCD.EE98.0025.0@wicourts.gov>
<1190015368.148293.56830@y42g2000hsy.googlegroups.com>
<46EE2C53.EE98.0025.0@wicourts.gov>
"Kevin Grittner" <Kevin.Grittner@wicourts.gov> writes:
> On Mon, Sep 17, 2007 at 2:49 AM, in message
> <1190015368.148293.56830@y42g2000hsy.googlegroups.com>, valgog
> <valgog@gmail.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?
regards, tom lane
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To: pgsql-performance@postgresql.org
Cc: tgl@sss.pgh.pa.us, Kevin.Grittner@wicourts.gov, valgog@gmail.com
Subject: Re: Index usage when bitwise operator is used
In-Reply-To: <21403.1190036229@sss.pgh.pa.us>
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