Davies Liu created SPARK-12077:
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Summary: Use more robust plan for single distinct aggregation
Key: SPARK-12077
URL: https://issues.apache.org/jira/browse/SPARK-12077
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 1.6.0
Reporter: Davies Liu
Assignee: Davies Liu
Use try to match the behavior for single distinct aggregation with Spark 1.5,
but that's not scalable, we should be robust by default, have a flag to address
performance regression for low cardinality aggregation.
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