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From "weijie.tong (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-5691) multiple count distinct query planning error at physical phase
Date Thu, 27 Jul 2017 02:30:00 GMT
weijie.tong created DRILL-5691:
----------------------------------

             Summary: 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: 1.10.0, 1.9.0
            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 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 "

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.








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