Greg Stark <gsstark@mit.edu> writes:
> I wonder if the bitmap can actually be one bit per page actually.
Yeah, I think we'd agreed that per-page was the way to go. Per-tuple
bitmaps are painful to manage because of the variable number of tuples
per page. And really all you need to know is whether to read the page
or not --- once you have, examining multiple tuples on it doesn't cost
much.
regards, tom lane