public ConditionAggregateInterface::exists($field, $function, $langcode = NULL)
Queries for the existence of a field.
$field:
string $langcode:
\Drupal\Core\Entity\Query\QueryInterface::exists()
public function exists($field, $function, $langcode = NULL);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!Query!ConditionAggregateInterface.php/function/ConditionAggregateInterface::exists/8.1.x