public &Select::getGroupBy()
Returns a reference to the group-by array for this query.
Because this method returns by reference, alter hooks may edit the group-by array directly to make their changes. If just adding additional grouping fields, however, the use of groupBy() is preferred.
Note that this method must be called by reference as well:
$fields =& $query->getGroupBy();
A reference to the group-by array structure.
Overrides SelectInterface::getGroupBy
public function &getGroupBy() { return $this->group; }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Database!Query!Select.php/function/Select::getGroupBy/8.1.x