@Override
  public <R, C> R accept(ExpressionVisitor<R, C> visitor, C context) {
    return visitor.visitGroupByTimeExpression(this, context);
  }
Only used for representing GROUP BY TIME filter.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/expression/other/GroupByTimeExpression.java