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https://issues.apache.org/jira/browse/IMPALA-2581?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong updated IMPALA-2581:
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Issue Type: Improvement (was: Bug)
> Push down "LIMIT" when possible
> --------------------------------
>
> Key: IMPALA-2581
> URL: https://issues.apache.org/jira/browse/IMPALA-2581
> Project: IMPALA
> Issue Type: Improvement
> Components: Frontend
> Affects Versions: Impala 2.5.0
> Reporter: Jim Apple
> Priority: Minor
> Labels: performance
>
> In a table t with a column x with no null values, "SELECT DISTINCT x FROM t
> LIMIT 1" should be roughly instant. Instead, it finds *all* the distinct
> values, then returns one of them.
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