contrib/intarray has an index type which could be what you need.
I was wondering about index types. Oracle has an index type called a 'bitmap' index. They describe this as an index for low cardinality fields, where only the cardinal values are indexed in a b-tree, and then it uses a bitmap below that to describe rows. They say that this type of index is very fast when combined with queries that used the indexed row in 'AND' clauses in a sql statement as the index can 'mask' the results very fast. I have not been able to benchmark the actual effectiveness of this kind of index, but I was wondering if anyone has had experience with this an believes it might be a useful feature for postgres?
Yes I have a vested interest in this because alot of my searches are masked against low cardinality fields 'Y' or 'N' type things where this could potentialy benefit me...
Alex Turner NetEconomist
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