CREATE AGGREGATE concat (
BASETYPE = anyelement,
SFUNC = array_append,
STYPE = anyarray,
FINALFUNC = join_array,
INITCOND = '{}'
);
CREATE AGGREGATE concat (
BASETYPE = anyelement,
SFUNC = array_append,
STYPE = anyarray,
FINALFUNC = join_array,
INITCOND = '{}'
);