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From: Andrei Lepikhov <[email protected]>
To: Tom Lane <[email protected]>
Cc: Lillian Berry <[email protected]>
Cc: [email protected]
Cc: [email protected]
Subject: Re: Slow queries on simple index
Date: Sun, 18 Jan 2026 10:24:56 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>
	<[email protected]>

On 17/1/26 22:10, Tom Lane wrote:
> Andrei Lepikhov <[email protected]> writes:
>> Hmm, where is the evidence that your query uses theindex? Maybe the
>> generic plan accidentally forces SeqScan?
> 
> Oh ... you're on to something.  I think we all assumed that this was
> an intermittent problem, but if it happens every time, I bet it's a
> datatype mismatch issue.
Yes, index mismatches due to type differences are frequently a pain for 
me in the world of auto-generated queries. Why not spend a few 
additional cycles to check whether a potential cast is possible?
I didn't track what happened in this example, but it would be beneficial 
to let an extension implement such functionality. The prosupport 
machinery attached to an index looks like a promising approach.

-- 
regards, Andrei Lepikhov,
pgEdge

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