[
https://issues.apache.org/jira/browse/HIVE-22538?focusedWorklogId=349483&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-349483
]
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
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
Issue Time Tracking
-------------------
Worklog Id: (was: 349483)
Remaining Estimate: 0h
Time Spent: 10m
> 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}
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
