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https://issues.apache.org/jira/browse/SPARK-12213?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen updated SPARK-12213:
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Component/s: SQL
> Query with only one distinct should not having on expand
> --------------------------------------------------------
>
> Key: SPARK-12213
> URL: https://issues.apache.org/jira/browse/SPARK-12213
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Davies Liu
>
> Expand will double the number of records, slow down projection and
> aggregation, it's better to generate a plan without Expand for a query with
> only one distinct (for example, ss_max in TPCDS)
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