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https://issues.apache.org/jira/browse/SPARK-15752?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Herman van Hovell resolved SPARK-15752.
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Resolution: Fixed
Assignee: Lianhui Wang
> Optimize metadata only query that has an aggregate whose children are
> deterministic project or filter operators
> ---------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-15752
> URL: https://issues.apache.org/jira/browse/SPARK-15752
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Lianhui Wang
> Assignee: Lianhui Wang
>
> when query only use metadata (example: partition key), it can return results
> based on metadata without scaning files. Hive did it in HIVE-1003.
> design document:
> https://docs.google.com/document/d/1Bmi4-PkTaBQ0HVaGjIqa3eA12toKX52QaiUyhb6WQiM/edit?usp=sharing
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