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-478078167 so the data type resolving logic is still needed, but if we use new attributes, the `withDataType` API is not needed. How about we remove `withDataType` from this PR and move forward? We can explore the new attributes idea later.
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