Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/13494
hi @lianhuiwang , we need to propagate partition information bottom up, but
adding a `isMetadataColumn` to `NamedExpression` is kind of overkill. I tried
to simplify it a little bit, and make it arguably easier to understand. Could
you take a look at
https://github.com/apache/spark/compare/master...cloud-fan:metadata-only?expand=1
? thanks!
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