public function orOn(
        /*# string */ $firstTableCol,
        /*# string */ $operator = ClauseInterface::NO_OPERATOR,
        /*# string */ $secondTableCol = ClauseInterface::NO_VALUE
    ) {
        return $this->on(
            $firstTableCol, $operator, $secondTableCol, true
        );
    }
public function orOn(
        /*# string */ $firstTableCol,
        /*# string */ $operator = ClauseInterface::NO_OPERATOR,
        /*# string */ $secondTableCol = ClauseInterface::NO_VALUE
    ) {
        return $this->on(
            $firstTableCol, $operator, $secondTableCol, true
        );
    }
{@inheritDoc}