Github user MaxGekk commented on the issue:
https://github.com/apache/spark/pull/22429
> Can we change `maxFields: Option[Int]` to `maxFields: Int` so that the
caller will never forget to pass it in and it should either get it from some
place or use the default value.
@zsxwing Sure, but only replacing `Option[Int]` by `Int` cannot guarantee
that. Need to remove default value to force a caller to pass a value to
`simpleString()`
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