Karl Denninger <karl(at)denninger(dot)net> writes:
> That doesn't help in this case as the returned set will typically be
> quite large, with the condition typically being valid on anywhere from
> 10-80% of the returned tuples.
In that case you'd be wasting your time to get it to use an index
for the condition anyway. Maybe you need to take a step back and
look at the query as a whole rather than focus on this particular
condition.
regards, tom lane