Github user WeichenXu123 commented on the issue:
https://github.com/apache/spark/pull/19666
@smurching I guess if iterating over gray code will have higher time
complexity O(n * 2^n), (Not very sure, maybe there's some high efficient
algos?) , the recursive traverse in my PR only need O(2^n).
and , recursive traversing has advantage in "pruning", the pruning
condition I mentioned above "1 <= combNumber <= numSplits", recursive
traversing can pruning the total subtree, and save about half the time. Can
iterating over gray code also do this ?
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