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From: Paul M. Aoki <aoki@CS.Berkeley.EDU>
To: Wolf-D. Ihlenfeldt <wolf@molout.tutkie.tut.ac.jp>
Cc: postgres@postgres.Berkeley.EDU
Subject: Re: How to interface hash access to user types
Date: Fri, 15 Jul 94 19:14:49 -0700
Message-ID: <199407160214.TAA10688@nobozo.CS.Berkeley.EDU> (raw)
In-Reply-To: <9407141119.AA12463@molout.tutkie.tut.ac.jp>

wolf@molout.tutkie.tut.ac.jp (Wolf-D. Ihlenfeldt) writes:
> he Postgres 4.2 documentation explains in detail
> how to interface user data types to btree access methods
> but seems to be completely silent about introducing a
> hash access method for a user data type. Does anybody
> know the necessary steps ? 

the hash am has only one strategy, which corresponds to "=" (instead 
of the five required by btrees).

the hash am needs one "support" function, which corresponds to your 
hash function (like btrees, which also have one support function).

once you know that, it shouldn't be too hard to figure out what to do
from the btree instructions and the existing contents of the catalogs..
--
  Paul M. Aoki          |  University of California at Berkeley
  aoki@CS.Berkeley.EDU  |  Dept. of EECS, Computer Science Division (#1776) 
                        |  Berkeley, CA 94720-1776

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