Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/22775
Maybe I am too much careful about it but I am kind of nervous about this
column case. I don't intend to disallow it entirely but only for Spark 2.4. We
might have to find a way to use column column with `from_json` but I want to
defer to 3.0.
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