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From: Frédéric Yhuel <[email protected]>
To: Andrei Lepikhov <[email protected]>
To: Tom Lane <[email protected]>
Cc: [email protected] <[email protected]>
Cc: Jehan-Guillaume de Rorthais <[email protected]>
Cc: Christophe Courtois <[email protected]>
Cc: Laurenz Albe <[email protected]>
Subject: Re: Indexes on expressions with multiple columns and operators
Date: Tue, 23 Sep 2025 15:31:18 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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On 9/23/25 12:43, Andrei Lepikhov wrote:
> But is it the same for the 'distinct' statistics? It seems you should 
> love it - the number of groups in GROUP-BY, DISTINCT, and even HashJoin 
> should be estimated more precisely, no?

I think it has more potential, and I would love to use this weapon, but 
I haven't had the opportunity yet. It would be interesting to know how 
much it is used in real life.

To get back to the topic of partitioned statistics, do you know if SQL 
Server is smart enough to handle this case [1] that we discussed last 
year? (with filtered statistics)

[1] 
https://www.postgresql.org/message-id/flat/b860c71a-7cab-4d88-ad87-8c1f2eea9ae8%40dalibo.com

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