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Posted to issues@drill.apache.org by "weijie.tong (JIRA)" <ji...@apache.org> on 2017/07/27 02:30:00 UTC
[jira] [Created] (DRILL-5691) multiple count distinct query
planning error at physical phase
weijie.tong created DRILL-5691:
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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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