On 12/07/2014 03:54 AM, Tomas Vondra wrote:
The one interesting case is the 'step skew' with statistics_target=10,
i.e. estimates based on mere 3000 rows. In that case, the adaptive
estimator significantly overestimates:
values currentadaptive
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Hi!
This was initially posted to pgsql-performance in this thread:
http://www.postgresql.org/message-id/5472416c.3080...@fuzzy.cz
but pgsql-hackers seems like a more appropriate place for further
discussion.
Anyways, attached is v3 of the patch implementing the adaptive ndistinct
estimator.
