Lists: | pgsql-hackers |
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From: | Craig Ringer <craig(at)2ndquadrant(dot)com> |
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To: | PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | TODO item: Accept aliases for values in ROW(...) constructor |
Date: | 2014-11-25 01:32:05 |
Message-ID: | 5473DC15.9060504@2ndquadrant.com |
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Lists: | pgsql-hackers |
Hi all
Especially with the introduction of json support, but also in the past
with hstore and other things, I've sometimes found myself wishing I
could provide aliases in an anonymous row constructor, e.g.
ROW(x AS something, y AS somethingelse)
The same thing can be done using a scalar subquery wrapping a
subquery-in-FROM returning a single row, but it's pretty ugly:
(SELECT r FROM (SELECT x AS something, y AS somethingelse) r)
That's what I've done to produce json a lot, though, and will need to
continue to do so until 9.4's json_build_object etc are in the wild.
While that'll solve the need for json, I'm sure others will come up. So
in case someone feels like exploring the parser a little, does it seem
reasonable to add ROW(...) with aliases to the TODO?
Or, alternately, and perhaps more generally useful, allow rowtype
specifications for anonymous records outside function-call context, like:
ROW(x1,y1) AS r(x integer, y integer)
Related:
http://stackoverflow.com/q/13227142/398670
--
Craig Ringer http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
From: | Craig Ringer <craig(at)2ndquadrant(dot)com> |
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To: | PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: TODO item: Accept aliases for values in ROW(...) constructor |
Date: | 2014-11-25 01:33:55 |
Message-ID: | 5473DC83.6080903@2ndquadrant.com |
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> ROW(x AS something, y AS somethingelse)
Apologies, it looks like Pavel already bought this up:
and I missed it.
--
Craig Ringer http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
From: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
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To: | Craig Ringer <craig(at)2ndquadrant(dot)com> |
Cc: | PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: TODO item: Accept aliases for values in ROW(...) constructor |
Date: | 2014-11-30 19:17:28 |
Message-ID: | CAFj8pRAx7pVQFwuUnVJ=4iag67z8c1KwXS2kQkup8h0MdX=VQQ@mail.gmail.com |
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Lists: | pgsql-hackers |
Hi Craig
Is there agreement on proposed syntax ROW(x AS something, y AS
somethingelse) ?
I can start work on this topic this week.
Regards
Pavel
2014-11-25 2:33 GMT+01:00 Craig Ringer <craig(at)2ndquadrant(dot)com>:
>
>
> > ROW(x AS something, y AS somethingelse)
>
> Apologies, it looks like Pavel already bought this up:
>
>
http://www.postgresql.org/message-id/CAFj8pRB1T1W6g0sppn-jEtyzJPLUUz_FxtNbme5Okd3XxVFx_w@mail.gmail.com
>
> and I missed it.
>
> --
> Craig Ringer http://www.2ndQuadrant.com/
> PostgreSQL Development, 24x7 Support, Training & Services
>
>
> --
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