Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/136#issuecomment-37732906
@pwendell , the limit case is not a practical example. In that case, we
need re-partition for most operations to be efficient. Also, this is really for
small window sizes like 2 to 5 in my mind. We tell users that this would
trigger a Spark job. I put the work in getPartitions because operations such as
aggregate and foreach do not need a second job, which we can put the optimized
version later.
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