Github user ProtD commented on the issue:
https://github.com/apache/spark/pull/18872
@srowen It worked in v2.0, but was broken probably in v2.2.0 by
b3d39620c563e5f6a32a4082aa3908e1009c17d2. Current unit tests check writing only
for dataframes which were previously read from a LibSVM format, not general
ones. (And I guess people don't write LibSVMs very often - that may be why
nobody has reported it.)
@WeichenXu123 Yes, good idea, will do it!
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