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Re: Index only scans for expressional indices when querying for the expression

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Subject: Re: Index only scans for expressional indices when querying for the expression
From: "David G. Johnston" <david.g.johnston@xxxxxxxxx>
Date: Thu, 4 Aug 2022 05:28:07 -0700
Cc: "pgsql-general@xxxxxxxxxxxxxxxxxxxx" <pgsql-general@xxxxxxxxxxxxxxxxxxxx>
In-reply-to: <CAFZC=QqFpth2mCw=vQHak_mpcY9s_M3HVP6TgChAdf6Lnq_bEg@mail.gmail.com>
References: <CAFZC=QqFpth2mCw=vQHak_mpcY9s_M3HVP6TgChAdf6Lnq_bEg@mail.gmail.com>

On Thursday, August 4, 2022, Danny Shemesh <dany74q@xxxxxxxxx> wrote:

I believe the expressional index in itself could've been considered as covering, when querying for the _expression_ explicitly.

This belief is wrong. When storing f(x) there is no way to recover the value of x.

David J.

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