On 12/17/2015 07:20 PM, Robert Haas wrote:

If this doesn't regress performance in the case where the number of
buckets is estimated accurately to begin with, then I think this is
a great idea. Can you supply some performance tests results for that
case, and maybe some of the other cases also?

I don't see how it could regress performance, and the benchmarks I've done confirm that. I'll do more thorough benchmarking and post the results here, but not now as this patch is in 2016-01 CF and I want to put all my time into reviewing patches from the open commitfest.


Tomas Vondra                  http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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