Re: [COMMITTERS] pgsql: Collect and use multi-column dependency stats

On 5 April 2017 at 18:48, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Simon Riggs <simon@2ndQuadrant.com> writes:
>> Collect and use multi-column dependency stats
>
> The buildfarm is unhappy about the fact that this changed the API
> for clauselist_selectivity().  I am not convinced that that change
> was a good idea, so before telling FDW authors that they need to
> change their code, I'd like to hear a defense of the API change.
> Why not just use the existing varRelid parameter for that?  Why
> is there an assumption that only one rel's extended stats will
> ever be of interest?  This function does get used for join clauses.

Point noted. Reading thread and hope to fix today.

-- 
Simon Riggs                http://www.2ndQuadrant.com/
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