Currently, in comes first and from comes second. But this can be confusing, since from is the "outer" branch and in is the "inner" branch. By analogy to the nested loop join (nlj) operator, the outer branch should come first and the inner branch second when printing SBE strings to the console. Similarly, when drawing trees on a whiteboard, the outer branch is drawn as the left child and the inner branch is drawn as the right child.