public QueryInterface::exists($field, $langcode = NULL)
Queries for a non-empty value on a field.
$field: Name of a field.
$langcode: Language code (optional).
\Drupal\Core\Entity\Query\QueryInterface
public function exists($field, $langcode = NULL);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!Query!QueryInterface.php/function/QueryInterface::exists/8.1.x