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https://issues.apache.org/jira/browse/HIVE-22549?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jesus Camacho Rodriguez updated HIVE-22549:
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Status: Patch Available (was: In Progress)
> RS deduplication should not merge final aggregation without keys
> ----------------------------------------------------------------
>
> Key: HIVE-22549
> URL: https://issues.apache.org/jira/browse/HIVE-22549
> Project: Hive
> Issue Type: Bug
> Components: Physical Optimizer
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Priority: Major
> Attachments: HIVE-22549.patch
>
>
> This may lead to performance degradation. For instance, this can happen for
> the following query:
> {code}
> set hive.support.concurrency=true;
> set hive.txn.manager=org.apache.hadoop.hive.ql.lockmgr.DbTxnManager;
> EXPLAIN
> CREATE TABLE x STORED AS ORC TBLPROPERTIES('transactional'='true') AS
> SELECT * FROM SRC x CLUSTER BY x.key;
> {code}
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