On Mon, Mar 17, 2014 at 10:54 PM, Tom Lane <t...@sss.pgh.pa.us> wrote:

> Atri Sharma <atri.j...@gmail.com> writes:
> > On Mon, Mar 17, 2014 at 9:45 PM, Tom Lane <t...@sss.pgh.pa.us> wrote:
> >> Possibly worth noting is that in past discussions, we've concluded that
> >> the most sensible type of hint would not be "use this plan" at all, but
> >> "here's what to assume about the selectivity of this WHERE clause".
> >> That seems considerably less likely to break than any attempt to
> directly
> >> specify plan details.
> > Isnt using a user given value for selectivity a pretty risky situation as
> > it can horribly screw up the plan selection?
> And forcing a plan to be used *isn't* that?  Please re-read the older
> threads, since you evidently have not.
I never said that we force a plan to be used. I just said that we should
increase the preference for a user given plan and not interfere in the cost
estimation of the other potential plans and the evaluation of the final
selected plan.





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