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 |
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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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