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https://issues.apache.org/jira/browse/HIVE-16432?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jesus Camacho Rodriguez resolved HIVE-16432.
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Resolution: Duplicate
> Improve plan for subquery with EXISTS
> -------------------------------------
>
> Key: HIVE-16432
> URL: https://issues.apache.org/jira/browse/HIVE-16432
> Project: Hive
> Issue Type: Sub-task
> Components: Logical Optimizer
> Reporter: Vineet Garg
> Assignee: Krisztian Kasa
> Priority: Major
>
> If an EXISTS/NOT EXISTS subquery contains an aggregate (with no group by or
> windowing) it is guaranteed to produce at least one row. Since such subquery
> in WHERE clause tests for existence of row it could be replaced by true
> during compile time.
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