Creates a new group of conditions ANDed together.
For example, consider a drawing entity type with a 'figures' multi-value field containing 'shape' and 'color' columns. To find all drawings containing both a red triangle and a blue circle:
$query = entity_query('drawing');
$group = $query
->andConditionGroup()
->condition('figures.color', 'red')
->condition('figures.shape', 'triangle');
$query
->condition($group);
$group = $query
->andConditionGroup()
->condition('figures.color', 'blue')
->condition('figures.shape', 'circle');
$query
->condition($group);
$entity_ids = $query
->execute();
\Drupal\Core\Entity\Query\ConditionInterface
public function andConditionGroup();