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https://issues.apache.org/jira/browse/HIVE-22538?focusedWorklogId=349483&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-349483
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ASF GitHub Bot logged work on HIVE-22538:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 26/Nov/19 01:14
Start Date: 26/Nov/19 01:14
Worklog Time Spent: 10m
Work Description: jcamachor commented on pull request #855: HIVE-22538
URL: https://github.com/apache/hive/pull/855
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> RS deduplication does not always enforce
> hive.optimize.reducededuplication.min.reducer
> --------------------------------------------------------------------------------------
>
> Key: HIVE-22538
> URL: https://issues.apache.org/jira/browse/HIVE-22538
> Project: Hive
> Issue Type: Bug
> Components: Physical Optimizer
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-22538.patch
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> For transactional tables, that property might be overriden to 1, which can
> lead to merging final aggregation into a single stage (hence leading to
> performance degradation). For instance, when autogather column stats is
> enabled, 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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