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https://issues.apache.org/jira/browse/SPARK-12077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15034620#comment-15034620
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Davies Liu commented on SPARK-12077:
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https://github.com/apache/spark/pull/10075
> 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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