Ivan Voras <ivoras@xxxxxx> writes: > select * from tt where (flags & 16) != 0; > > I suspected radix trees could be used for this but it seems it doesn't work > that way. You would need a gist index method to make this work. I actually worked on one for a while and had it working. But it wasn't really finished. If there's interest I could finish it up and put it up somewhere like pgfoundry. > If not, is there a way of quickly filtering by such "elements of a set" that > doesn't involve creating 32 boolean fields (which would also need to be pretty > uselessly indexed separately)? You could create 32 partial indexes on some other column which wouldn't really take much more space than a single index on that other column. But that won't let you combine them effectively as a gist index would. -- greg
