@Test
public void testFs() throws Exception {
SQLResponse response = executor.exec("select fs from sys.nodes limit 1");
assertThat(response.rowCount(), is(1L));
assertThat(response.rows()[0][0], instanceOf(Map.class));
Map<String, Object> fs = (Map<String, Object>)response.rows()[0][0];
assertThat(fs.keySet().size(), is(3));
assertThat(fs.keySet(), hasItems("total", "disks", "data"));
Map<String, Object> total = (Map<String, Object>) fs.get("total");
assertThat(total.keySet(), hasItems("size", "used", "available", "reads", "writes",