Task 1 plpgsql done

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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;