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From: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
To: Erik Rijkers <er@xs4all.nl>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Cc: Sergei Kornilov <sk@zsrv.org>
Cc: Michael Paquier <michael.paquier@gmail.com>
Cc: Jaime Casanova <jaime.casanova@2ndquadrant.com>
Subject: Re: [HACKERS] generated columns
Date: Mon, 1 Apr 2019 10:52:27 +0200
Message-ID: <59e69246-8f32-b3cb-af4c-8c359d4049c7@2ndquadrant.com> (raw)
In-Reply-To: <e61c597ac4541b77750594eea73a774c@xs4all.nl>
References: <b151f851-4019-bdb1-699e-ebab07d2f40a@2ndquadrant.com>
	<CAJGNTeOxeQPFpEr35PME4yLayRzP_wwzt70kFrPztSTWHf-HDA@mail.gmail.com>
	<CAJGNTeM+MCjA4dBhAdjJ-vR_CwY3u65cCcc+KvnahzLHZjxjbw@mail.gmail.com>
	<1bc948f8-3bab-6c54-50af-c0723a75b85f@2ndquadrant.com>
	<20180116063546.GA3679@paquier.xyz>
	<48502d9b-60c4-5b10-40a2-e34f562132b4@2ndquadrant.com>
	<20180119051804.GC12826@paquier.xyz>
	<2e3d5147-16f8-af0f-00ab-4c72cafc896f@2ndquadrant.com>
	<20180131131804.GB1586@paquier.xyz>
	<bf9c8765-1aa0-432a-442e-45f715ebe4e7@2ndquadrant.com>
	<20180202022532.GA84623@paquier.xyz>
	<050e663d-d915-f61b-af96-5a09c10ade02@2ndquadrant.com>
	<79e4de23-52e3-2c45-9ba0-5f6932f590aa@2ndquadrant.com>
	<28574501540912440@iva5-750e13568e4d.qloud-c.yandex.net>
	<2ddd0bfa-0fcd-35ec-266c-f03cf72fc581@2ndquadrant.com>
	<26129f50-cf47-2013-8f9b-e7a98853aa69@2ndquadrant.com>
	<17fd00ff02ede468e2a3d63ff8cd5ff7@xs4all.nl>
	<e61c597ac4541b77750594eea73a774c@xs4all.nl>

On 2019-03-31 05:49, Erik Rijkers wrote:
> STORED in a 
> file_fdw foreign table still silently creates the column which then 
> turns out to be useless on SELECT, with an error like:
> 
> "ERROR:  column some_column_name is a generated column
> DETAIL:  Generated columns cannot be used in COPY."
> 
> Maybe it'd be possible to get an error earlier, i.e., while trying to 
> create such a useless column?

I'll look into it.

-- 
Peter Eisentraut              http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services





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