CREATE INDEX gin_idx ON test__int USING gin ( a );
INSERT INTO test__int ( SELECT ARRAY[t] || '{1000}'::_int4 FROM generate_series (1,300) as t );
INSERT INTO test__int ( SELECT ARRAY[t] || '{1001}'::_int4 FROM generate_series (1,300) as t, generate_series(1,12) );
CREATE INDEX gin_idx ON test__int USING gin ( a );
INSERT INTO test__int ( SELECT ARRAY[t] || '{1000}'::_int4 FROM generate_series (1,300) as t );
INSERT INTO test__int ( SELECT ARRAY[t] || '{1001}'::_int4 FROM generate_series (1,300) as t, generate_series(1,12) );