From: Andreas Gaab <A.Gaab@scanlab.de>
To: pgsql-sql@postgresql.org <pgsql-sql@postgresql.org>
Subject: aggregation of setof
Date: Fri, 28 Jan 2011 12:42:18 +0100
Message-ID: <48DA836F3865C54B8FBF424A3B775AF60132434B4A@Exchange-Server> (raw)
Hi all,
I would like to write a query, which aggregates the results of regexp_matches(). The problem is that regexp_matches returnes setof text[] as documented even if I discard the global flag (http://www.postgresql.org/docs/8.4/static/functions-matching.html#FUNCTIONS-POSIX-REGEXP ). Thus resulting in an error when I try to aggregate the result:
"
SELECT array_accum(
regexp_matches('foobarbequebazilbarfbonk', '(b[^b]+)(b[^b]+)')
)
-------------------------------
ERROR: set-valued function called in context that cannot accept a set
********** Fehler **********
ERROR: set-valued function called in context that cannot accept a set
SQL Status:0A000
"
Can I convert a 'setof text[]' to a 'text[]'?
Alternatively I could use a sub-select, but I am curious if there are other solutions around.
Regards,
Andreas
___________________________________________________________________________
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Dr. Andreas Simon Gaab
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___________________________________________________________________________
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To: pgsql-sql@postgresql.org
Cc: A.Gaab@scanlab.de
Subject: Re: aggregation of setof
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