public static Pair<String, String> parseDeadbandInfo(Map<String, String> props) {
    if (props == null) {
      return new Pair<>(null, null);
    }
    String deadband = props.get(LOSS);
    deadband = deadband == null ? null : deadband.toUpperCase(Locale.ROOT);
    Map<String, String> deadbandParameters = new HashMap<>();
    for (String k : SDT_PARAMETERS) {
      if (props.containsKey(k)) {
        deadbandParameters.put(k, props.get(k));
      }
    }

    return new Pair<>(
        deadband, deadbandParameters.isEmpty() ? null : String.format("%s", deadbandParameters));
  }
Group all the series under an aligned entity into one AlignedPath and remove these series from
pathToAggrIndexesMap. For example, input map: d1[s1] -> [1, 3], d1[s2] -> [2,4], will return
d1[s1,s2], [[1,3], [2,4]]
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/utils/MetaUtils.java