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https://issues.apache.org/jira/browse/HIVE-22263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17037302#comment-17037302
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Vineet Garg commented on HIVE-22263:
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+1
> 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: HIVE-22263.patch, 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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