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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 Tue, 08 Aug 2017 10:24:00 GMT

    [ https://issues.apache.org/jira/browse/DRILL-5691?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16118142#comment-16118142
] 

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

Github user arina-ielchiieva commented on a diff in the pull request:

    https://github.com/apache/drill/pull/889#discussion_r131871578
  
    --- Diff: exec/java-exec/src/test/java/org/apache/drill/exec/physical/impl/join/TestNestedLoopJoin.java
---
    @@ -325,4 +325,5 @@ public void testNlJoinWithLargeRightInputSuccess() throws Exception
{
           test(RESET_JOIN_OPTIMIZATION);
         }
       }
    +
    --- End diff --
    
    Please revert changes in this file.


> 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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