Hello everyone 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 operations are dealt with on a block-by-block basis. They have serious limitations, the main one being that bit-indexes must be kept in the range [0-8388599] I'm glad to give that away to this community, although I humbly am eager to get some feedback to realize if this compressed bitvector notion is of any help to someone else than myself :) Rgds, Jean "flynn" Flinois ---------------------------(end of broadcast)--------------------------- TIP 8: explain analyze is your friend
