@Test
void testConstructorEmptyTagValue() {

    tags.clear();
    tags.add(new StatisticTag("T1", "T1V"));
    tags.add(new StatisticTag("T2", ""));
    final SQLStatKey sqlStatKey = new SQLStatKey(time, statName, tags);
    final RollUpBitMask rollUpBitMask = RollUpBitMaskUtil.fromSortedTagList(tags);
    System.out.println(sqlStatKey.getName());
    assertThat(sqlStatKey.getName()).isEqualTo(statName + rollUpBitMask.asHexString() + buildTagsPart(tags));
}