cloud-fan commented on issue #23726: [SPARK-26812][SQL] Report correct nullability for complex datatypes in Union URL: https://github.com/apache/spark/pull/23726#issuecomment-462227447 I think it's a bug fix, as we may hit problems if a struct field is nullable but we report it as not. But I'm not sure how serious the bug is, sounds like it's hard to hit the bug.
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