Although this is not a patch, I have developped a set of
user-defined function to deal with compressed bitvectors,
which are the same than bit varying but much smaller
since they are compressed.
Since I am in a process to migrate my applications from mysql to postgresql,
they are juste made available for postgresql there :
http://www.vtech.fr/opensource (hope links are ok here?)
They are designed in such a way that setting or resetting a bit in the
bit array can be done without having to uncompress/recompress the bitvector.
In some cases, they might be faster than bit varying, since bitwise
are dealt with on a block-by-block basis.
They have serious limitations, the main one being that bit-indexes must be
in the range [0-8388599]
I'm glad to give that away to this community, although I humbly am eager to
some feedback to realize if this compressed bitvector notion is of any help
to someone else than myself :)
Jean "flynn" Flinois
pgsql-patches by date
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