From: Andrew Dunstan <andrew.dunstan@2ndquadrant.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-hackers@postgresql.org
Subject: Re: Domains and arrays and composites, oh my
Date: Thu, 28 Sep 2017 14:58:00 -0400
Message-ID: <044f3a1c-9e20-c08b-8f78-c47aa41d7a0c@2ndQuadrant.com> (raw)
In-Reply-To: <32440.1506618167@sss.pgh.pa.us>
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On 09/28/2017 01:02 PM, Tom Lane wrote:
>
>> I do think that treating a function returning a domain-over-composite
>> differently from one returning a base composite is a POLA. We'd be very
>> hard put to explain the reasons for it to an end user.
> Do you have any thoughts about how we ought to resolve that?
>
>
Not offhand. Maybe we need to revisit the decision not to modify the
executor at all. Obviously that would make the patch a good deal more
invasive ;-( One thought I had was that we could invent a new return
type of TYPEFUNC_DOMAIN_COMPOSITE so there would be less danger of a PL
just treating it as an unconstrained base type as it might do if it saw
TYPEFUNC_COMPOSITE.
Maybe I'm wrong, but I have a strong suspicion that of we leave it like
this now we'll regret it in the future.
cheers
andrew
--
Andrew Dunstan https://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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To: pgsql-hackers@postgresql.org
Cc: andrew.dunstan@2ndquadrant.com, tgl@sss.pgh.pa.us
Subject: Re: Domains and arrays and composites, oh my
In-Reply-To: <044f3a1c-9e20-c08b-8f78-c47aa41d7a0c@2ndQuadrant.com>
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