maji2014 created SPARK-4691:
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Summary: code optimization for judgement
Key: SPARK-4691
URL: https://issues.apache.org/jira/browse/SPARK-4691
Project: Spark
Issue Type: Bug
Reporter: maji2014
Priority: Minor
aggregator and mapSideCombine judgement in
HashShuffleWriter.scala
SortShuffleWriter.scala
HashShuffleReader.scala
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