From: Tom Lane <tgl@sss.pgh.pa.us>
To: Viktor Bojović <viktor.bojovic@gmail.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: aggregate function
Date: Tue, 03 Aug 2010 10:48:25 -0400
Message-ID: <19609.1280846905@sss.pgh.pa.us> (raw)
In-Reply-To: <AANLkTimo+SiM1VKiNM5V9tO4YMewn9+EoGV6NdJOpx+3@mail.gmail.com>
References: <AANLkTimo+SiM1VKiNM5V9tO4YMewn9+EoGV6NdJOpx+3@mail.gmail.com>
=?UTF-8?Q?Viktor_Bojovi=C4=87?= <viktor.bojovic@gmail.com> writes:
> I tried to write this part below, but something is wrong (ERROR: function
> grafika.pov_sphere(character varying, numeric, numeric, numeric, numeric,
> character varying) does not exist) so I wanted to ask if someone knows how
> to solve this problem.
Well, it's right: you didn't create such a function. The aggregate
transition function has to take the state datatype as its first
argument. You can't just plug these two randomly-chosen functions
into an aggregate definition and expect the system to intuit what you
want done. I think what you actually need is a transition function
that works something like
if ($1 is null)
return agg_pov_sphere($2,$3,...);
else
return concat($1, agg_pov_sphere($2,$3,...));
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, viktor.bojovic@gmail.com
Subject: Re: aggregate function
In-Reply-To: <19609.1280846905@sss.pgh.pa.us>
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