GitHub user jkbradley opened a pull request:
https://github.com/apache/spark/pull/12217
[SPARK-14408][CORE] Changed RDD.treeAggregate to use fold instead of reduce
## What changes were proposed in this pull request?
Previously, RDD.treeAggregate used reduceByKey and reduce in its
implementation, neither of which technically allows the seq/combOps to modify
and return their first arguments.
This PR uses foldByKey and fold instead and notes that aggregate and
treeAggregate are semantically identical in the Scala doc.
## How was this patch tested?
Existing unit tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jkbradley/spark tree-aggregate-fix
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12217.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #12217
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commit 93e3cb3b5127e27842f55870e25f876cb5e4ee1a
Author: Joseph K. Bradley <[email protected]>
Date: 2016-04-06T20:55:19Z
Changed RDD.treeAggregate to use fold instead of reduce
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