public function testGroupBy()
{
$sphinx = new SphinxClient();
$sphinx->setGroupBy('lat', SphinxClient::SPH_GROUPBY_ATTR);
$results = $sphinx->query('bb');
$this->assertEquals($results['total'], 3);
$sphinx->setGroupBy('attr1', SphinxClient::SPH_GROUPBY_ATTR);
$results = $sphinx->query('bb');
$this->assertEquals($results['total'], 5);
}