Prepares and returns a MERGE query object.
$options: An array of options on the query.
Drupal\Core\Database\Query\Merge A new Merge query object.
Drupal\Core\Database\Query\Merge
public function merge($table, array $options = array()) {
$class = $this
->getDriverClass('Merge');
return new $class($this, $table, $options);
}