Re: generalizing the planner knobs

"Neil Conway" <neilc@samurai.com> wrote
>
> This would also be useful when diagnosing bad query plans: for example,
> setting enable_seqscan=false often causes the planner to disregard the
> use of *any* sequential scan, anywhere in the plan. The ability to
> slightly bump up the cost of particular operations would allow more
> alternative plans to be examined.
>

This method also has the problem of "enable_seqscan=false" in some 
situations. I would vote we implement the final general solution like query 
plan hints directly.

Regards,
Qingqing