public function Select::getUnion in Drupal 9

Same name and namespace in other branches

1. 8 core/lib/Drupal/Core/Database/Query/Select.php \Drupal\Core\Database\Query\Select::getUnion()

Returns a reference to the union queries for this query. This include queries for UNION, UNION ALL, and UNION DISTINCT.

Because this method returns by reference, alter hooks may edit the tables array directly to make their changes. If just adding union queries, however, the use of the union() method is preferred.

Note that this method must be called by reference as well:

$fields =& $query
  ->getUnion();

Return value

A reference to the union query array structure.

Overrides SelectInterface::getUnion

File

core/lib/Drupal/Core/Database/Query/Select.php, line 410

Class

Select

Query builder for SELECT statements.

Namespace

Drupal\Core\Database\Query

Code

public function &getUnion() {
  return $this->union;
}