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--
-- Perl Weekly Challenge 215
-- Task 1
--
-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-215/>
--
CREATE SCHEMA IF NOT EXISTS pwc215;
CREATE OR REPLACE FUNCTION
pwc215.task1_plpgsql( words text[] )
RETURNS SETOF text
AS $CODE$
DECLARE
current_word text;
sorted_word text;
current_letter text;
BEGIN
FOREACH current_word IN ARRAY words LOOP
/*
sorted_word := '';
FOR current_letter IN SELECT l FROM regexp_split_to_table( current_word, '' ) l ORDER BY 1 LOOP
sorted_word := sorted_word || current_letter;
END LOOP;
*/
SELECT string_agg( c, '' )
INTO sorted_word
FROM ( SELECT c
FROM regexp_split_to_table( current_word, '' ) c
ORDER BY 1
) c;
IF sorted_word = current_word THEN
RETURN NEXT current_word;
END IF;
END LOOP;
RETURN;
END
$CODE$
LANGUAGE plpgsql;
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