On Mon, Mar 17, 2014 at 10:54 PM, Tom Lane <t...@sss.pgh.pa.us> wrote:
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> 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. Regards, Atri -- Regards, Atri *l'apprenant*
