@Override
  public boolean equals(Object obj) {
    if (!(obj instanceof GroupByParameter)) {
      return false;
    }
    GroupByParameter other = (GroupByParameter) obj;
    return this.windowType == other.windowType;
  }
The parameter of `GROUP BY` clause.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/plan/parameter/GroupByParameter.java