>>>>> "Alexander" == Alexander Kuzmenkov <a(dot)kuzmenkov(at)postgrespro(dot)ru> writes:
Alexander> Structurally, the patch consists of two major parts: a
Alexander> specialized executor node
Why?
It strikes me that the significant fact here is not that we're doing
count(*), but that we don't need any columns from the bitmap heap scan
result. Rather than creating a whole new node, can't the existing
bitmap heapscan be taught to skip fetching the actual table page in
cases where it's all-visible, not lossy, and no columns are needed?
(this would also have the advantage of getting parallelism for free)
--
Andrew (irc:RhodiumToad)