Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/136#issuecomment-37749785
For things like n-grams, isn't it okay to do them just per-partition and
not worry about doing stuff across partitions? I agree that both this approach
and the one in https://github.com/apache/incubator-spark/pull/18 are pretty
complex.
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