RedBeanPHP\Facade::setNarrowFieldMode PHP Method

    public static function setNarrowFieldMode($mode)
    {
        AQueryWriter::setNarrowFieldMode($mode);
    }

 /**
  * Tests R::setNarrowFieldMode() and
  * OODBBean::ignoreJoinFeature().
  */
 public function testSystemWideSettingsForJoins()
 {
     R::nuke();
     $author = R::dispense('author');
     $book = R::dispense('book');
     $info = R::dispense('info');
     $info->title = 'x';
     $author->xownBookList[] = $book;
     $book->info = $info;
     R::store($author);
     $author = $author->fresh();
     $books = $author->withCondition(' @joined.info.title != ? ', array('y1'))->xownBookList;
     $firstBook = reset($books);
     asrt(isset($firstBook->title), FALSE);
     R::setNarrowFieldMode(FALSE);
     $author = $author->fresh();
     $books = $author->withCondition(' @joined.info.title != ? ', array('y2'))->xownBookList;
     $firstBook = reset($books);
     asrt(isset($firstBook->title), TRUE);
     R::setNarrowFieldMode(TRUE);
 }