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;

 

à

ERROR:  functions cannot accept set arguments

 

 

 

Von: Viktor Bojović [mailto:viktor.bojovic@gmail.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.Gaab@scanlab.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