Recursive function that receives a list of IDs and returns all child IDs

["Sven Haag" <sven-haag@xxxxxx>]

hello pgsql fans out there,

i've already created a function that returns a list of IDs of all sub-samples based on a given sample ID. this works fine. now i like to extend this function so that it can receive a list of sample IDs. e.g.:

fn_get_subsamples(IN sample_numbers SETOF integer)


here is the existing function:

CREATE OR REPLACE FUNCTION fn_get_subsamples(IN sample_number integer)
  RETURNS SETOF integer AS
$BODY$
	WITH RECURSIVE recursetree(sample_number) AS (
	  SELECT sample_number
	  FROM sample
	  WHERE parent_sample = $1
	  
	  UNION ALL
	  
	  SELECT t.sample_number
	  FROM sample t
	  JOIN recursetree rt ON rt.sample_number = t.parent_sample
	)
	
	SELECT sample_number
	FROM recursetree;
$BODY$
  LANGUAGE sql VOLATILE



thanks a lot for every hint!
sven
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