On Mon, 2013-01-21 at 00:48 -0500, Tom Lane wrote:
> I looked at this patch. ISTM we should not have the option at all but
> just do it always. I cannot believe that always-go-left is ever a
> preferable strategy in the long run; the resulting imbalance in the
> index will surely kill any possible benefit. Even if there are some
> cases where it miraculously fails to lose, how many users are going to
> realize that applies to their case and make use of the option?
Sounds good to me.
If I remember correctly, there was also an argument that it may be
useful for repeatable test results. That's a little questionable for
performance (except in those cases where few penalties are identical
anyway), but could plausibly be useful for a crash report or something.
Regards,Jeff Davis