Github user Wenpei commented on the pull request:
https://github.com/apache/spark/pull/10587#issuecomment-169202207
Thanks, @srowen I will try to add parameter explain to fold.
But for treeAggregate, it has comments like below to refer to Aggregate
function. I thought it's enough for user.
* Aggregates the elements of this RDD in a multi-level tree pattern.
*
* @param depth suggested depth of the tree (default: 2)
* @see [[org.apache.spark.rdd.RDD#aggregate]]
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