From: Nico Williams <nico@cryptonector.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Adam Brusselback <adambrusselback@gmail.com>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: Re: generated columns
Date: Mon, 2 Oct 2017 13:46:42 -0500
Message-ID: <20171002184641.GJ1251@localhost> (raw)
In-Reply-To: <10550.1506969038@sss.pgh.pa.us>
References: <b151f851-4019-bdb1-699e-ebab07d2f40a@2ndquadrant.com>
<20171002152338.GH1251@localhost>
<CAMjNa7fhskTTMSLMUL=e1r-EOg2Q3-cSayEDB1MADmX_zzn1gw@mail.gmail.com>
<20171002181042.GI1251@localhost>
<10550.1506969038@sss.pgh.pa.us>
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On Mon, Oct 02, 2017 at 02:30:38PM -0400, Tom Lane wrote:
> Nico Williams <nico@cryptonector.com> writes:
> > On Mon, Oct 02, 2017 at 12:50:14PM -0400, Adam Brusselback wrote:
> >> So for me, i'd rather default to compute on read, as long storing the
> >> pre-computed value is an option when necessary.
>
> > Sure, I agree. I was just wondering whether there might be any other
> > difference besides performance characteristics. The answer to that is,
> > I think, "no".
>
> What about non-immutable functions in the generation expression?
Aha, thanks! Yes, that would be noticeable.
Nico
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To: pgsql-hackers@postgresql.org
Cc: nico@cryptonector.com, tgl@sss.pgh.pa.us, adambrusselback@gmail.com
Subject: Re: generated columns
In-Reply-To: <20171002184641.GJ1251@localhost>
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