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Posted to issues@hive.apache.org by "Jesus Camacho Rodriguez (Jira)" <ji...@apache.org> on 2020/02/12 05:49:00 UTC
[jira] [Work started] (HIVE-22263) MV has distinct on columns and
query has count(distinct) on one of the columns, we do not trigger
rewriting
[ https://issues.apache.org/jira/browse/HIVE-22263?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Work on HIVE-22263 started by Jesus Camacho Rodriguez.
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> MV has distinct on columns and query has count(distinct) on one of the columns, we do not trigger rewriting
> -----------------------------------------------------------------------------------------------------------
>
> Key: HIVE-22263
> URL: https://issues.apache.org/jira/browse/HIVE-22263
> Project: Hive
> Issue Type: Sub-task
> Components: CBO, Materialized views
> Affects Versions: 3.1.2
> Reporter: Steve Carlin
> Assignee: Jesus Camacho Rodriguez
> Priority: Critical
> Attachments: count-distinct.sql, count-distinct2.sql
>
>
> Count distinct issues with materialized views. Two scripts attached
> 1)
> create materialized view base_aview stored as orc as select distinct c1 c1, c2 c2 from base;
> explain extended select count(distinct c1) from base group by c2 ;
> 2)
> create materialized view base_aview stored as orc as SELECT c1 c1, c2 c2, sum(c2) FROM base group by 1,2;
> explain extended select count(distinct c1) from base group by c2;
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