Re: [HACKERS] Extended statistics is not working on Vars hidden undera RelabelType

On Fri, Oct 13, 2017 at 4:49 PM, David Rowley
<david.rowley@2ndquadrant.com> wrote:
> tps = 8282.481310 (including connections establishing)
> tps = 8282.750821 (excluding connections establishing)

vs.

> tps = 8520.822410 (including connections establishing)
> tps = 8521.132784 (excluding connections establishing)
>
> With the patch we are making use of the extended statistics, which we
> do expect to be more work for the planner. Although, we didn't add
> extended statistics to speed up the planner.

Sure, I understand.  That's actually a pretty substantial regression -
I guess that means that it's pretty important to avoid creating
extended statistics that are not needed, at least for short-running
queries.

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company


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