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help / color / mirror / Atom feedFrom: Tomas Vondra <[email protected]>
To: Corey Huinker <[email protected]>
To: Ashutosh Bapat <[email protected]>
Cc: [email protected]
Subject: Re: Statistics Import and Export
Date: Wed, 1 Nov 2023 21:07:27 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <CADkLM=dTHVSrcGBAstjshoZBXKJgWjzN3Vj53KQ9fORqvkaN5Q@mail.gmail.com>
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<CADkLM=dTHVSrcGBAstjshoZBXKJgWjzN3Vj53KQ9fORqvkaN5Q@mail.gmail.com>
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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