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https://issues.apache.org/jira/browse/HIVE-15848?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zoltan Haindrich updated HIVE-15848:
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Attachment: HIVE-15848.2.patch
> count or sum distinct incorrect when hive.optimize.reducededuplication set to
> true
> ----------------------------------------------------------------------------------
>
> Key: HIVE-15848
> URL: https://issues.apache.org/jira/browse/HIVE-15848
> Project: Hive
> Issue Type: Bug
> Affects Versions: 0.13.0
> Reporter: Biao Wu
> Assignee: Zoltan Haindrich
> Priority: Critical
> Attachments: HIVE-15848.1.patch, HIVE-15848.2.patch
>
>
> Test Table:
> {code:sql}
> create table test(id int,key int,name int);
> {code}
> Data：
> ||id||key||name||
> |1 |1 |2
> |1 |2 |3
> |1 |3 |2
> |1 |4 |2
> |1 |5 |3
> Test SQL1:
> {code:sql}
> select id,count(Distinct key),count(Distinct name)
> from (select id,key,name from count_distinct_test group by id,key,name)m
> group by id;
> {code}
> result：
> |1|5|4
> expect:
> |1|5|2
> Test SQL2:
> {code:sql}
> select id,count(Distinct name),count(Distinct key)
> from (select id,key,name from count_distinct_test group by id,name,key)m
> group by id;
> {code}
> result:
> |1|2|5
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