Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/14864
hi @tejasapatil , I think your second proposal(always preserve bucketing
across all operations) makes sense, but need more discussion to make the
decision. For now, I think it's ok to use your current approach, e.g. only
expose the `outputOrdering` if a bucket only has a single file, but we should
avoid listing files twice.
We can add a lazy val in `FileSourceScanExec`, to store the files after
partition prunning, and use it to calculate `outputOrdering` and `inputRDD`.
What do you think?
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