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From: Frédéric Yhuel <[email protected]>
To: Tom Lane <[email protected]>
To: Mark Frost <[email protected]>
Cc: [email protected] <[email protected]>
Cc: Alexander Korotkov <[email protected]>
Subject: Re: Poor row estimates from planner, stat `most_common_elems` sometimes missing for a text[] column
Date: Fri, 6 Jun 2025 10:07:38 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <PH3PPF1C905D6E6F24A5C1A1A1D8345B593E16FA@PH3PPF1C905D6E6.namprd15.prod.outlook.com>
	<[email protected]>
	<[email protected]>



On 6/5/25 23:52, Tom Lane wrote:
> The idea of treating lack of MCELEM differently from complete
> lack of stats still seems to have merit, though.


Couldn't we count / estimate the number of distinct two-by-two elements, 
and use that instead of the default selectivity estimate?

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