liuxian created SPARK-23389:
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Summary: When the shuffle dependency specifies aggregation ,and
`dependency.mapSideCombine=false`, we should be able to use serialized sorting.
Key: SPARK-23389
URL: https://issues.apache.org/jira/browse/SPARK-23389
Project: Spark
Issue Type: Improvement
Components: Spark Core
Affects Versions: 2.3.0
Reporter: liuxian
When the shuffle dependency specifies aggregation ,and
`dependency.mapSideCombine=false`, in the map side,there is no need for
aggregation and sorting, so we should be able to use serialized sorting.
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