Hannu Krosing <hannu@tm.ee> writes:
> How hard would it be to _not_ include nulls in indexes
> as they are not used anyway.
Seems to me that would be a step backwards.
What should someday happen is to make IS NULL an indexable operator.
The fact that we haven't got around to doing so is not a reason to
rip out the underpinnings for it.
regards, tom lane