Github user viirya commented on the issue:
https://github.com/apache/spark/pull/16724
@cloud-fan Yeah, I think it is reasonable that the ordering should be
preserved if the writer doesn't specify partitioning and bucketing (we already
did this now), or the specified partitioning is same as the input data
(currently we don't do this). It is reasonable is because bucketing can be
thought as a kind of data partition. And the data ordering after a data
partition can't be guaranteed, I think.
@igozali I think you don't need to bucket the data in each partition, right?
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