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From: Michael Paquier <michael@paquier.xyz>
To: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
Cc: Michael Paquier <michael.paquier@gmail.com>
Cc: Jaime Casanova <jaime.casanova@2ndquadrant.com>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: Re: [HACKERS] generated columns
Date: Sun, 11 Feb 2018 23:10:53 +0900
Message-ID: <20180211141053.GA11084@paquier.xyz> (raw)
In-Reply-To: <bf9c8765-1aa0-432a-442e-45f715ebe4e7@2ndquadrant.com>
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>

On Thu, Feb 01, 2018 at 09:29:09AM -0500, Peter Eisentraut wrote:
> That would be nice.  I'm going to study this some more to see what can
> be done.

By the way, cannot we consider just doing stored generated columns as a
first cut?  Both virtual and stored columns have their use cases, but
stored values have less complication and support actually a larger set
of features, including rowtypes, index and constraint support.  So it
seems to me that if something goes into v11 then stored columns would be
a better choice at this stage of the development cycle.  Other DBMSs
support stored values by default as well, and your v1 patch had a large
portion of the work done if I recall correctly.
--
Michael

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