public QueryFactoryInterface::getAggregate(EntityTypeInterface $entity_type, $conjunction)
Instantiates an aggregation query object for a given entity type.
\Drupal\Core\Entity\EntityTypeInterface $entity_type: The entity type definition.
string $conjunction:
\Drupal\Core\Entity\Query\QueryAggregateInterface The query object that can query the given entity type.
\Drupal\Core\Entity\Query\QueryException
public function getAggregate(EntityTypeInterface $entity_type, $conjunction);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!Query!QueryFactoryInterface.php/function/QueryFactoryInterface::getAggregate/8.1.x