Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/21598
We will add a configuration for it as a safe safeguard. I think we should
incrementally fix things to be the righter behaviour in upper versions ..
really. If you meant in the JIRA and PR, this behaivour should be considered as
an option, then probably it makes sense to leave it `false` by default.
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