Github user nongli commented on the pull request:
https://github.com/apache/spark/pull/10604#issuecomment-169133603
@cloud-fan I'm not sure I understand your question. We are guaranteed that
for a bucketed data set, each file in HDFS is for the same bucket. We need to
coalesce however the input split decided to split the file back into one RDD
partition per bucket, grouping using the file name.
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