2 * Copyright (C) 2004-2008 Georgia Public Library Service
3 * Copyright (C) 2008 Equinox Software, Inc.
4 * Mike Rylander <miker@esilibrary.com>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
20 DROP AGGREGATE IF EXISTS public.first(anyelement) CASCADE;
21 DROP AGGREGATE IF EXISTS public.last(anyelement) CASCADE;
22 DROP AGGREGATE IF EXISTS public.agg_text(text) CASCADE;
24 CREATE OR REPLACE FUNCTION public.first_agg ( anyelement, anyelement ) RETURNS anyelement AS $$
25 SELECT CASE WHEN $1 IS NULL THEN $2 ELSE $1 END;
26 $$ LANGUAGE SQL STABLE;
28 CREATE AGGREGATE public.first (
29 sfunc = public.first_agg,
30 basetype = anyelement,
34 CREATE OR REPLACE FUNCTION public.last_agg ( anyelement, anyelement ) RETURNS anyelement AS $$
36 $$ LANGUAGE SQL STABLE;
38 CREATE AGGREGATE public.last (
39 sfunc = public.last_agg,
40 basetype = anyelement,
44 CREATE OR REPLACE FUNCTION public.text_concat ( TEXT, TEXT ) RETURNS TEXT AS $$
52 $$ LANGUAGE SQL STABLE;
54 CREATE AGGREGATE public.agg_text (
55 sfunc = public.text_concat,