Edmund Horner <ejrh00@gmail.com> writes:
> On Sat, 22 Dec 2018 at 07:10, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> I'm not entirely sure why you're bothering; surely nulltestsel is
>> unrelated to what this patch is about?
> I found that it made a difference with selectivity of range comparisons,
> because clauselist_selectivity tries to correct for it (clausesel.c:274):
Oh, I see.
> I guess we could have a standalone patch to add this for all system columns?
+1
regards, tom lane