public QueryAggregate::existsAggregate($field, $function, $langcode = NULL)
Queries for the existence of a field.
string $field: The name of the field.
string $function: The aggregate function.
$langcode: (optional) The language code.
\Drupal\Core\Entity\Query\QueryAggregateInterface The called object.
Overrides QueryAggregateInterface::existsAggregate
public function existsAggregate($field, $function, $langcode = NULL) { return $this->conditionAggregate->exists($field, $function, $langcode); }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!Query!Sql!QueryAggregate.php/function/QueryAggregate::existsAggregate/8.1.x