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