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https://issues.apache.org/jira/browse/HIVE-22797?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gopal Vijayaraghavan updated HIVE-22797:
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Labels: performance (was: )
> ACID: Remove the map-side GBY for the Merge cardinality check
> -------------------------------------------------------------
>
> Key: HIVE-22797
> URL: https://issues.apache.org/jira/browse/HIVE-22797
> Project: Hive
> Issue Type: Bug
> Components: Physical Optimizer, Transactions
> Reporter: Gopal Vijayaraghavan
> Priority: Major
> Labels: performance
>
> The hash-aggregate of the cardinality check on the mapper is entirely useless
> as the ideal scenario is that we don't have any duplicates at all.
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