Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/2847#issuecomment-71765551
Had an offline discussion with @jackylk and @zhangyouhua2014 . We plan to
add a utility class named `FPTree` with the following:
~~~
def add(transaction: Array[String]): this.type
def merge(tree: FPTree): this.type
def extract(threshold: Int, validateSuffix: String => Boolean):
Iterator[Array[String]]
~~~
and the use `aggregateByKey` to grow trees in parallel.
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