Liang-Chi Hsieh created SPARK-11055:
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Summary: Use mixing hash-based and sort-based aggregation in
TungstenAggregationIterator
Key: SPARK-11055
URL: https://issues.apache.org/jira/browse/SPARK-11055
Project: Spark
Issue Type: Improvement
Components: SQL
Reporter: Liang-Chi Hsieh
In TungstenAggregationIterator we switch to sort-based aggregation when we
can't allocate more memory for hashmap.
However, using external sorter-based aggregation will write too much key-value
pairs into disk. We should use mixing hash-based and sort-based aggregation to
reduce the key-value pairs needed to write to disk.
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