Github user markhamstra commented on the pull request:
https://github.com/apache/spark/pull/11720#issuecomment-202434831
The basic idea is a good one, but in addition to needing to spend some time
sorting out the logic around that `assert`, I'm a little concerned about the
performance implications of the multiple scans of the data structures in the
`filter`, `forall` and `for`. It looks to be possible to compose these so that
the performance will be better at the expense of a little less legible code.
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