@Override
    public Timestamp getTimestamp(final int columnIndex) throws SQLException {
        return (Timestamp) ResultSetUtils.convertValue(mergeResultSet.getValue(columnIndex, Timestamp.class), Timestamp.class);
    }
@Test
    void assertGetTimestampWithColumnIndex() throws SQLException {
        when(mergeResultSet.getValue(1, Timestamp.class)).thenReturn(new Timestamp(0L));
        assertThat(shardingSphereResultSet.getTimestamp(1), is(new Timestamp(0L)));
    }