Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/15354
@marmbrus Sure (I didn't mean I am not going to do this..), I just handled
the case in this PR for `to_json`.
BTW, I would like to note that there are the same problems in other JSON
related functionalities. For example, I might have to add
```scala
override def checkInputDataTypes(): TypeCheckResult = {
...
JacksonUtils.verifySchema(child.dataType.asInstanceOf[StructType])
...
}
```
for `from_json` as well. Let me please open a follow up for adding this
logic and test for JSON related functionalities.
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