public PartialPath getAliasSeriesPath() {
    if (this.isAliasSeries()) {
      if (this.getExpression().getExpressionType() == ViewExpressionType.TIMESERIES) {
        String pathString = ((TimeSeriesViewOperand) this.getExpression()).getPathString();
        try {
          return new MeasurementPath(pathString);
        } catch (IllegalPathException e) {
          throw new RuntimeException(e);
        }
      }
    }
    return null;
  }
@return return the path of alias series if this view is alias series; else return null.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/mtree/impl/mem/mnode/info/LogicalViewInfo.java