There is a --diff option that works if the rows and columns are both exactly aligned. But this post makes me think about adding functionality to match by row k

There is a --diff option that works if the rows and columns are both exactly aligned. But this post makes me think about adding functionality to match by row key and column name, possibly via the "diff" join (current diff join is more like an "xor"). If you have ideas in this regard I'd love to hear them!