| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> |
| Cc: | Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp>, Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Tatsuo Ishii <ishii(at)postgresql(dot)org>, David Steele <david(at)pgmasters(dot)net>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Petr Jelinek <petr(at)2ndquadrant(dot)com>, Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: multivariate statistics (v19) |
| Date: | 2017-01-30 20:37:14 |
| Message-ID: | 20170130203714.latitwfmrzukgugh@alvherre.pgsql |
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| Lists: | pgsql-hackers |
Tomas Vondra wrote:
> The 'built' flags may be easily replaced with a check if the bytea-like
> columns are NULL, and the 'enabled' columns may be replaced by the array of
> char, just like you proposed.
>
> That'd give us a single catalog looking like this:
>
> pg_mv_statistics
> starelid
> staname
> stanamespace
> staowner -- all the above as currently
> staenabled array of "char" {d,f,s}
> stakeys
> stadeps (dependencies)
> standist (ndistinct coefficients)
> stamcv (MCV list)
> stahist (histogram)
>
> Which is probably a better / simpler structure than the current one.
Looks good to me. I don't think we need to keep the names very short --
I would propose "standistinct", "stahistogram", "stadependencies".
Thanks,
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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