Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/16347
@junegunn I think it's not a problem, `df.write.xxx` is not guaranteed to
retain the ordering of `df` when writing data output.
Currently the `DataFrameWriter` doesn't provide an interface to specify the
ordering of the data written, if you do wanna guarantee the ordering of output,
please use bucketed table in Spark SQL.
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