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Unique index using hash?

From: ocie(at)paracel(dot)com
To: hackers(at)postgreSQL(dot)org
Subject: Unique index using hash?
Date: 1998-03-17 01:45:15
Message-ID: 9803170145.AA01836@dolomite.paracel.com (view raw or flat)
Thread:
Lists: pgsql-hackers
I was playing around with my latest compile and tried to make a unique
index on two columns, using a hash method.  Both of these (more than
one column and unique) are currently not allowed for hash indexes.

I thought about this for a bit and realized that making a NESTED hash
index (index on a and b also serves as an index on a) would be a
trick, but allowing the unique clause should not be a problem.

Therefore, I would like to try implementing unique constraints on hash
indexes.  Has this come up before?  Are there any reasons not to
support this?  As far as I understand, specifying an index method is
non standard (above and beyond standard) to begin with.

Ocie Mitchell


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