Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/22775
I think I'm not qualified to make the decision here, as I don't fully
understand the use case.
It looks to me that one use case would be to run `schema_of_json` on a
column and manually figure out what's the final schema, and then use this
schema in `from_json`. If `schema_of_string` only accepts literal, I'm not how
users would use it.
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