Re: aggregation of setof

Functions apparently cannot take setof arguments.

Postgres 8.4:

CREATE OR REPLACE FUNCTION testtable(IN setof anyarray)
RETURNS anyarray AS
$BODY$
SELECT $1 LIMIT 1;
$BODY$
LANGUAGE 'sql' STABLE;

-->
ERROR: functions cannot accept set arguments

Von: Viktor Bojović [mailto:viktor(dot)bojovic(at)gmail(dot)com]
Gesendet: Samstag, 29. Januar 2011 09:28
An: Andreas Gaab
Betreff: Re: [SQL] aggregation of setof

i have never used that type but maybe you can try this;
-create function which returns text[], and takse setof text as argument (if possible)
-reach every text[] in set of text[] using array index
-return values using "return next" for each text in text[] which is in set of text[]

On Fri, Jan 28, 2011 at 12:42 PM, Andreas Gaab <A(dot)Gaab(at)scanlab(dot)de<mailto:A(dot)Gaab(at)scanlab(dot)de>> wrote:
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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--
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Viktor Bojović
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Wherever I go, Murphy goes with me