[SPARK-14408][CORE] Changed RDD.treeAggregate to use fold instead of reduce#18198

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HyukjinKwon:SPARK-14408

Commits on Jun 4, 2017

Changed RDD.treeAggregate to use fold instead of reduce

jkbradley
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HyukjinKwon
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Still testing treeAggregate implementations

jkbradley
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HyukjinKwon
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fixed bug in treeAgg test

jkbradley
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HyukjinKwon
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Fixed incorrect statement about failure

jkbradley
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HyukjinKwon
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Fixed bug in treeAggregate using fold

jkbradley
authored and
HyukjinKwon
committed

Commits on Jun 5, 2017