Davies Liu created SPARK-11425:
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Summary: Improve hybrid aggregation (sort-based after hash-based)
Key: SPARK-11425
URL: https://issues.apache.org/jira/browse/SPARK-11425
Project: Spark
Issue Type: Improvement
Reporter: Davies Liu
After aggregation, the dataset could be smaller than inputs, so it's better to
do hash based aggregation for all inputs, then using sort based aggregation to
merge them.
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