if (swapInputs(mq, multiJoin, left, right, selfJoin)) { LoptJoinTree tmp = right; right = left;
if (swapInputs(mq, multiJoin, left, right, selfJoin)) { LoptJoinTree tmp = right; right = left;
if (swapInputs(mq, multiJoin, left, right, selfJoin)) { LoptJoinTree tmp = right; right = left;
if (swapInputs(mq, multiJoin, left, right, selfJoin)) { LoptJoinTree tmp = right; right = left;