src/PicORM/QueryBuilder.php
public function resetSelect($field = null)
    {
        $this->_select = array();
        if ($field !== null) {
            $this->select($field);
        }

        return $this;
    }
public function resetSelect($field = null)
    {
        $this->_select = array();
        if ($field !== null) {
            $this->select($field);
        }

        return $this;
    }
Reset select and add a new field

@param $field

@return $this