Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/14864
I'm not sure it's safe to do so. A bucket may have more than one files(this
can happen if we append data into bucketed table), so for each file, it's
sorted, but for the whole bucket, it is NOT, because currently Spark SQL
doesn't guarantee the records are sorted across all files of a bucket.
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