| From: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> |
|---|---|
| To: | Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com> |
| Cc: | Mark Dilger <hornschnorter(at)gmail(dot)com>, Adrien Nayrat <adrien(dot)nayrat(at)dalibo(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [HACKERS] PATCH: multivariate histograms and MCV lists |
| Date: | 2018-02-24 22:01:59 |
| Message-ID: | 2db97323-4967-9a9e-51ac-ac7db64f0922@2ndquadrant.com |
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| Thread: | |
| Lists: | pgsql-hackers |
Hi,
Attached is an updated version of the patch, fixing some minor bitrot
and duplicate OIDs.
Sadly, this patch series does not seem to move forward very much, and
I'm not sure how to change that :-/ But I'd like to point out that while
those new statistics are still per-table, we might use them to improve
join estimates (which is kinda the elephant in the room, when it comes
to estimates) similarly to what eqjoinsel() does with per-column stats.
regards
--
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
| Attachment | Content-Type | Size |
|---|---|---|
| 0001-Keep-information-about-already-estimated-cl-20180224.patch.gz | application/gzip | 937 bytes |
| 0002-multivariate-MCV-lists-20180224.patch.gz | application/gzip | 31.5 KB |
| 0003-multivariate-histograms-20180224.patch.gz | application/gzip | 45.6 KB |
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