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First version of multi-key index support for GiST

From: Oleg Bartunov <oleg(at)sai(dot)msu(dot)su>
To: <pgsql-hackers(at)postgresql(dot)org>
Cc: <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Subject: First version of multi-key index support for GiST
Date: 2001-05-26 12:33:01
Message-ID: Pine.GSO.4.33.0105261531370.14271-100000@ra.sai.msu.su (view raw or flat)
Thread:
Lists: pgsql-hackers
We have implemented multi-key index support for GiST. Patch is available
from  http://www.sai.msu.su/~megera/postgres/gist/code/7.1.2/patch_multikeygist.7.1.2.gz
The patch could be applied for postgresql version 7.1.2 and current sources 7.2

1. initdb is required. But, it's possible just to execute update
   update pg_am set amstrategies = 12 where amname = 'gist';

2. You have to recompile all gist_*_ops functions

3. multi-key indexes works only for для gist__int_ops and
   gist__intbig_ops (from contrib/intarray), because they have
   support for NULLs.

As a bonus we fixed several memory leaks in old GiST code.


Example:

create index mgix on tabletest using gist (b gist_int_ops, a
                                     gist__intbig_ops ) with ( islossy );


	Regards,
		Oleg
_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
Internet: oleg(at)sai(dot)msu(dot)su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83


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