Github user hhbyyh commented on the issue:
https://github.com/apache/spark/pull/17218
@jkbradley Regarding the question, in most definition Association Rules are
defined between two ItemSets and ArrayType seems to be a more intuitive choice
for me. It just happens that the AssociationRules in mllib supports only single
item as the consequent for now, which may be changed in the future. And I don't
think there would be a noticeable performance improvement for `transform` from
the change.
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