Threw it into TODO.detail performance, not optimizer.
> Bruce Momjian <pgman@candle.pha.pa.us> writes:
> > Tom, did we ever test this? I think we did and found that it was the
> > same or worse, right?
>
> I tried it and didn't see any noticeable improvement on the particular
> test case I was using, so I got discouraged and didn't pursue the idea
> further. I'd like to come back to it someday, though.
>
> regards, tom lane
>
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