I like the new bitmap scans and I'm wondering if there is any way I can utilize them for my bitmask column, defined as bit(1024). I use this column as a sort of fingerprint to quickly scan my tables. But it is a scan, not an index. I have not figured out a way to index the bitmask column. Is there some way it can be used as an index now that there are bitmap scans in 8.1? Currently I do this: Select * from mytable where contains(bitmask, fingerprint(user_data)) and matches(datacolumn, user_data); user_data is a string, like a regexp but with different semantics for chemical data. bitmask is precomputed/stored as bit(1024) = fingerprint(datacolumn) contains(a,b) returns bool as 'select b=(a&b);' This works well because matches() is an expensive functions. But it would work better if bitmask could be indexed, no? TJ O'Donnell ---------------------------(end of broadcast)--------------------------- TIP 5: don't forget to increase your free space map settings
