public List<Byte> getRespAliasColumns() {
    if (respAliasColumns == null) {
      BitSet aliasMap = new BitSet();
      for (int i = 0; i < columnHeaders.size(); ++i) {
        if (columnHeaders.get(i).hasAlias()) {
          aliasMap.set(i);
        }
      }
      respAliasColumns = new ArrayList<>(Bytes.asList(aliasMap.toByteArray()));
    }
    return respAliasColumns;
  }
The header of query result dataset.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/common/header/DatasetHeader.java