| From: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> |
|---|---|
| To: | Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> |
| Cc: | David Rowley <david(dot)rowley(at)2ndquadrant(dot)com>, Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, Andres Freund <andres(at)anarazel(dot)de>, Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Mark Dilger <hornschnorter(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [HACKERS] PATCH: multivariate histograms and MCV lists |
| Date: | 2019-03-27 19:55:07 |
| Message-ID: | 20190327195507.GA21957@development |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
Hi,
I've now committed the MCV part, after addressing the last two issues
raised by Dean:
* The MCV build now always uses the mincount to decide which of the
items to keep in the list.
* Both the MCV build and deserialization now uses the same maximum number
of list items (10k).
Unfortunately, I forgot to merge these two fixes before pushing, so I had
to commit them separately. Sorry about that :/
Attached are the remaining parts of this patch series - the multivariate
histograms, and also a new patch tweaking regression tests for the old
statistic types (ndistinct, dependencies) to adopt the function-based
approach instead of the regular EXPLAIN.
But those are clearly a matter for the future (well, maybe it'd make sense
to commit the regression test change now).
regards
--
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
| Attachment | Content-Type | Size |
|---|---|---|
| 0001-adopt-regression-tests.patch.gz | application/gzip | 3.1 KB |
| 0002-multivariate-histograms.patch.gz | application/gzip | 48.4 KB |
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