Re: New data type: uniqueidentifier

"Dmitry G. Mastrukov" <dmitry@taurussoft.org> writes:
> Alex Pilosov <alex@pilosoft.com> wrote:
>> On Tue, 26 Jun 2001, Dmitry G. Mastrukov wrote:
> I've marked "=" operator with HASH clause (and planner has started to
> use
> hash jons). But as I understand the right way is to create special hash
> function (may be wrapper for hash_any(), isn't it?) and register it for
> hash
> as for btree method.
>> 
>> No. Currently, there's no way to specify a hash function for a given
>> operator, it always uses a builtin function that operates on memory
>> representation of a value.

> Strange. When I execute following query (slightly modified query from User's
> Guide chapter 7.6)

You're looking at support for hash indexes, which have nothing to do
with hash joins.

*Why* they have nothing to do with hash joins, I dunno.  You'd think
that using the same hash functions for both would be a good idea.
But that's not how it's set up at the moment.
        regards, tom lane