Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/16981
> From JSON is harder because the second argument is a StructType. We could
consider accepting a string in the DDL format for declaring a tables schema
(i.e. a: Int, b: struct<a:Int, c: String>....
To parse the schema represented in DDL format, instead of the json format,
we need to call the parser to do it. If you are not familar with the parser,
maybe you only implement `to_json` in this PR?
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