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Posted to issues-all@impala.apache.org by "liuyao (Jira)" <ji...@apache.org> on 2021/09/23 02:57:00 UTC

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

    [ https://issues.apache.org/jira/browse/IMPALA-2581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17418914#comment-17418914 ] 

liuyao commented on IMPALA-2581:
--------------------------------

https://gerrit.cloudera.org/#/c/17821/

> 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
>
> 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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