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Posted to issues-all@impala.apache.org by "Jim Apple (JIRA)" <ji...@apache.org> on 2018/10/30 17:38:01 UTC

[jira] [Updated] (IMPALA-2581) Push down LIMIT past DISTINCT

     [ https://issues.apache.org/jira/browse/IMPALA-2581?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jim Apple updated IMPALA-2581:
------------------------------
    Summary: Push down LIMIT  past DISTINCT  (was: Push down "LIMIT"  when possible)

> 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
>            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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