public function __clone()
 {
     parent::__clone();
     $this->groupByPropertyNames = ArrayHelper::cloneArray($this->groupByPropertyNames);
     $this->subjectPropertyNames = ArrayHelper::cloneArray($this->subjectPropertyNames);
     $this->adjustedGroupByPropertyNames = ArrayHelper::cloneArray($this->adjustedGroupByPropertyNames);
     $this->adjustedSubjectPropertyNames = ArrayHelper::cloneArray($this->adjustedSubjectPropertyNames);
 }
 public function __clone()
 {
     parent::__clone();
     $this->keyColumnNames = ArrayHelper::cloneArray($this->keyColumnNames);
 }