Re: Question about explain of index scan

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>
Cc: Hannu Krosing <hannu(at)skype(dot)net>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Question about explain of index scan
Date: 2005-09-02 15:03:24
Message-ID: 14337.1125673404@sss.pgh.pa.us
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Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> writes:
> I wonder why we don't support more operators on Xid, so these things are
> avoided? Right now we only have =, AFAIR.

I once started to make a btree opclass for XID, and stopped when it
occurred to me that XID comparison doesn't obey the transitive law.
btree won't like that...

regards, tom lane

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