| From: | Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com> |
|---|---|
| To: | Corey Huinker <corey(dot)huinker(at)gmail(dot)com>, Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com> |
| Cc: | pgsql-hackers(at)lists(dot)postgresql(dot)org |
| Subject: | Re: Statistics Import and Export |
| Date: | 2023-11-01 20:07:27 |
| Message-ID: | f0930823-d44b-21df-d718-ee3c657d9087@enterprisedb.com |
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| Lists: | pgsql-hackers |
On 10/31/23 08:25, Corey Huinker wrote:
>
> Attached is v2 of this patch.
>
> New features:
> * imports index statistics. This is not strictly accurate: it
> re-computes index statistics the same as ANALYZE does, which is to
> say it derives those stats entirely from table column stats, which
> are imported, so in that sense we're getting index stats without
> touching the heap.
Maybe I just don't understand, but I'm pretty sure ANALYZE does not
derive index stats from column stats. It actually builds them from the
row sample.
> * now support extended statistics except for MCV, which is currently
> serialized as an difficult-to-decompose bytea field.
Doesn't pg_mcv_list_items() already do all the heavy work?
regards
--
Tomas Vondra
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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