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Re: Table function support

From: "Pavel Stehule" <pavel(dot)stehule(at)hotmail(dot)com>
To: tgl(at)sss(dot)pgh(dot)pa(dot)us
Cc: pgsql-patches(at)postgresql(dot)org
Subject: Re: Table function support
Date: 2007-04-11 07:16:16
Message-ID: BAY20-F162A01A3DE31F6F2550166F95F0@phx.gbl (view raw or flat)
Thread:
Lists: pgsql-patches
>I've been looking at this, and my feeling is that we should drop the
>PROARGMODE_TABLE business and just define RETURNS TABLE(x int, y int)
>as exactly equivalent to RETURNS SETOF RECORD with x and y treated as
>OUT parameters.  There isn't any advantage to distinguishing the cases
>that outweighs breaking client code that looks at pg_proc.proargmodes.
>I don't believe that the SQL spec prevents us from exposing those
>parameter names to PL functions, especially since none of our PLs are
>in the standard at all.
>

Reason for PROARGMODE_TABLE was protection before name's collision, and x, 
and y are table attributies (not variables) and then we are protected before 
collision. It's shortcut for

create function foo() returns setof record as ...
select * from foo() as (x int, y int);

Regards
Pavel Stehule

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