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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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liuyao updated IMPALA-2581:
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Fix Version/s: Impala 4.1.0
> Push down LIMIT past DISTINCT
> ------------------------------
>
> 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
> Assignee: liuyao
> Priority: Minor
> Labels: performance
> Fix For: Impala 4.1.0
>
>
> 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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