@Override
    public boolean equals(Object o) {
      if (this == o) {
        return true;
      }
      if (o == null || getClass() != o.getClass()) {
        return false;
      }
      TableWatermark that = (TableWatermark) o;
      return tableId == that.tableId &&
          Objects.equals(validWriteIdList, that.validWriteIdList);
    }
Internal class to identify uniquely a Table.
ql/src/java/org/apache/hadoop/hive/ql/metadata/HiveMetaStoreClientWithLocalCache.java