Guarantees/Semantics of pg_stats

From: "Baziotis, Stefanos" <sb54(at)illinois(dot)edu>
To: "pgsql-general(at)lists(dot)postgresql(dot)org" <pgsql-general(at)lists(dot)postgresql(dot)org>
Subject: Guarantees/Semantics of pg_stats
Date: 2024-03-02 07:41:46
Message-ID: PH8PR11MB8061725CB9BACBED45D76F77AB5D2@PH8PR11MB8061.namprd11.prod.outlook.com
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Hi,

I'm interested in learning more about the guarantees/semantics of pg_stats. For example, is there a guarantee that the n_distinct and most_common_vals fields will take into account any values appearing more than M times or maybe with frequence more than f? In what cases will n_distinct and most_common_vals will miss some values?

Any pointers to documentation or source code would be greatly appreciated.

Best,
Stefanos

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