Github user rdblue commented on the issue:
https://github.com/apache/spark/pull/21305
@cloud-fan, I've added a suite for the `DataType.canWrite`. I still need to
add tests for the analyzer rule to make sure it catches any problems and so to
validate that AppendData's `resolved` check. If you want to look at the
`canWrite` suite in the mean time, I think it's ready for review.
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