public QueryBase::groupBy($field, $langcode = NULL)
Specifies the field to group on.
string $field: The name of the field to group by.
\Drupal\Core\Entity\Query\QueryAggregateInterface The called object.
Overrides QueryAggregateInterface::groupBy
public function groupBy($field, $langcode = NULL) { $this->groupBy[] = array( 'field' => $field, 'langcode' => $langcode, ); return $this; }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!Query!QueryBase.php/function/QueryBase::groupBy/8.1.x