Re: brin regression test intermittent failures

I wrote:
> I think it would be a good idea to extend the brinopers table to include
> the number of expected matches, and to complain if that's not what we got,
> rather than simply checking for zero.

Also, further experimentation shows that there are about 30 entries in the
brinopers table that give rise to seqscan plans even when we're commanding
a bitmap scan, presumably because those operators aren't brin-indexable.
They're not the problematic cases, but things like 
((charcol)::text > 'A'::text)

Is there a reason to have such things in the table, or is this just a
thinko?  Or is it actually a bug that we're getting such plans?
        regards, tom lane