Github user mgaido91 commented on the issue:
https://github.com/apache/spark/pull/21403
@maryannxue that is feasible too and indeed it was the original
implementation I did, I switched to this approach according to [this
discussion](https://github.com/apache/spark/pull/21403#discussion_r198826199):
the goal was to avoid to change the `In` signature and the parsing logic in the
many places.
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