Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/6810#issuecomment-111844007
I'm actually working on some tooling that will make it very easy to write
regressions tests for these kinds of issues (basically, a way to instantiate
individual operators and run them with canned inputs, which is much easier than
trying to rig a high-level query that triggers the code path under test). This
should not block on that, though, but I'll ping this thread later today with an
example of how we could write such a test.
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