Re: Index usage when bitwise operator is used

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
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 13:37:09
Message-ID: 21403.1190036229@sss.pgh.pa.us
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-performance

"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?

regards, tom lane

In response to

Responses

Browse pgsql-performance by date

  From Date Subject
Next Message Kevin Grittner 2007-09-17 14:30:26 Re: Index usage when bitwise operator is used
Previous Message Decibel! 2007-09-17 12:27:39 Re: [Again] Postgres performance problem