Github user MaxGekk commented on the issue:
https://github.com/apache/spark/pull/21472
@HyukjinKwon @maropu I am trying to use DDL instead of JSON for schema
specification. Cannot find how to specify `nullable`, for example:
- `valueContainsNull` for `MapType`
- `nullable` for `StructField`
- `containsNull` for `ArrayType`
Is DDL really equal to JSON format?
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