Simon Riggs writes:
> What seems strange is that we make no attempt to check whether we have
> already identified all tuples being removed by the VACUUM. We have the
> number of dead tuples we are looking for and we track the number of
> tuples we have deleted from the index, so we could easily ma
During btvacuumscan(), we lock the index for extension and then wait
to acquire a cleanup lock on the last page. Then loop until we find a
point where the index has not expanded again during our wait for lock
on that last page. On a busy index this can take some time, especially
when people regular
