@Override
public void visit(SubJoin subJoin) {
FromItem left = subJoin.getLeft();
FromItem right = subJoin.getJoin().getRightItem();
FromItemVisitorImpl leftVisitor = new FromItemVisitorImpl(where);
FromItemVisitorImpl rightVisitor = new FromItemVisitorImpl(where);
left.accept(leftVisitor);
right.accept(rightVisitor);
relationProvider = PlanFactory.getInstance().newJoin();
((Join) relationProvider)
.setInput(leftVisitor.getRelationProvider(), rightVisitor.getRelationProvider());
}
