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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-5691) multiple count distinct query planning error at physical phase
Date Wed, 23 Aug 2017 12:29:00 GMT

    [ https://issues.apache.org/jira/browse/DRILL-5691?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16138284#comment-16138284
] 

ASF GitHub Bot commented on DRILL-5691:
---------------------------------------

Github user arina-ielchiieva commented on the issue:

    https://github.com/apache/drill/pull/889
  
    +1, LGMT.


> multiple count distinct query planning error at physical phase 
> ---------------------------------------------------------------
>
>                 Key: DRILL-5691
>                 URL: https://issues.apache.org/jira/browse/DRILL-5691
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - Relational Operators
>    Affects Versions: 1.9.0, 1.10.0
>            Reporter: weijie.tong
>
> I materialized the count distinct query result in a cache , added a plugin rule to translate
the (Aggregate、Aggregate、Project、Scan) or (Aggregate、Aggregate、Scan) to (Project、Scan)
at the PARTITION_PRUNING phase. Then ,once user issue count distinct queries , it will be
translated to query the cache to get the result.
> eg1: " select count(*),sum(a) ,count(distinct b)  from t where dt=xx " 
> eg2:"select count(*),sum(a) ,count(distinct b) ,count(distinct c) from t where dt=xxx
"
> eg3:"select count(distinct b), count(distinct c) from t where dt=xxx"
> eg1 will be right and have a query result as I expected , but eg2 will be wrong at the
physical phase.The error info is here: https://gist.github.com/weijietong/1b8ed12db9490bf006e8b3fe0ee52269.

> eg3 will also get the similar error.



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