Re: Optimize join selectivity estimation by not reading MCV stats for unique join attributes

Tomas Vondra <tomas.vondra@enterprisedb.com> writes:
> On 11/18/22 09:54, David Geier wrote:
>> I couldn't come up with any reasonable way of writing an automated test
>> for that.

> I don't think you can write a test for this, because there is no change
> to behavior that can be observed by the user.

Yeah, and the delta in performance is surely too small to be
measured reliably in the buildfarm.  I think coverage will have
to be sufficient.

            regards, tom lane