@Override
  public boolean isClosed()
      throws SQLException {
    return _closed;
  }
@Test
  public void isClosedTest()
          throws Exception {
    PinotConnection pinotConnection =
                 new PinotConnection("dummy", _dummyPinotClientTransport, "dummy", _dummyPinotControllerTransport);
    Assert.assertFalse(pinotConnection.isClosed());
    pinotConnection.close();
    Assert.assertTrue(pinotConnection.isClosed());
  }