/**
* @param Select $select
* @return string
*/
public function _renderSelectColumns(Select $select)
{
$cols = $select->getForcedColumns() ? $select->getForcedColumns() : $select->getAllColumns();
array_walk($cols, function (&$col) {
if ($col instanceof Column) {
$col = $this->_renderColumnWithAlias($col);
} else {
if ($col instanceof Token) {
$col = $this->_renderToken($col);
}
}
});
$prefix = " ";
$separator = ", ";
return $prefix . implode($separator, $cols);
}