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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