/**
* @param Select $select
* @return string
*/
public function _renderSelectGroupBy(Select $select)
{
$str = "";
if (count($select->getGroup())) {
$groupCols = $select->getGroup();
array_walk($groupCols, function (&$col) {
$col = $this->_renderColumn($col);
});
$str = "GROUP BY";
$str .= " ";
$separator = ", ";
$str .= implode($separator, $groupCols);
}
return $str;
}
