Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/21427
> we can't just change the behavior. We think the old behavior doesn't make
sense and users should change their code, but users may not think in this way.
I think this basically mean we will have every configuration for each
behaviour change whether it's a bug or not.
If we failed to explain why users could think it makes sense in a way, how
about elaborating it rather then thinking hypothetically there might be.
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