Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/3510#issuecomment-65018001
That's a good catch, but the children data type converting criteria for
`Coalesce` need to be discussed more deeply. Generally, I think we'd better
keep it the same as Hive does. And it will be nicer if a Hive query suite
provided.
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