gistfile1.sql

CREATE OR REPLACE FUNCTION array_array_agg_sfunc(state integer[][], p integer[]) RETURNS integer[][] AS $$
BEGIN
    IF p IS NULL THEN
      RETURN state;
    END IF;
    IF array_dims(state) IS NULL THEN
      RETURN ARRAY[p];
    END IF;
    RETURN array_cat(state, p);
  END;
$$ LANGUAGE plpgsql IMMUTABLE;

DROP AGGREGATE IF EXISTS array_array_agg(integer[]);

CREATE AGGREGATE array_array_agg (
  basetype = integer[][],
  sfunc = array_array_agg_sfunc,
  stype = integer[][],
  initcond = '{}'
);