Github user davies commented on the pull request:
https://github.com/apache/spark/pull/1601#issuecomment-50372083
Spark SQL does not support Set/List, so we should treat all sets from
Python as Seq, then they can't be converted back. In other way, we could drop
the set support right now.
@mateiz @marmbrus Do we need to clean up these in this PR, or do it later
in another issue?
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