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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: Thu, 25 Sep 2025 12:41:18 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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On 9/23/25 12:20, Frédéric Yhuel wrote:
> On 9/22/25 23:15, Andrei Lepikhov wrote:
>> I'm not sure I fully understand your case, but SQL Server demonstrates 
>> an interesting approach: they have a WHERE clause attached to 
>> statistics. So, having implemented this, you may separate the whole 
>> range of values inside the table into 'partitions' by such a WHERE 
>> condition.
> 
> Yes, from what I understood of the documentation [1], this is exactly 
> what I would like!

I've tested it and I can confirm that it works very well.

So, on SQL Server, you can do this:
CREATE STATISTICS FooStats ON foo (ackid, crit) WHERE crit = 'WARNING';

It would be great to have a similar feature in PostgreSQL.

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