public QueryAggregateInterface::groupBy($field)
Specifies the field to group on.
string $field: The name of the field to group by.
\Drupal\Core\Entity\Query\QueryAggregateInterface The called object.
public function groupBy($field);
© 2001–2016 by the original authors
Licensed under the GNU General Public License, version 2 and later.
Drupal is a registered trademark of Dries Buytaert.
https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!Query!QueryAggregateInterface.php/function/QueryAggregateInterface::groupBy/8.1.x