[
https://issues.apache.org/jira/browse/HIVE-5358?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Phabricator updated HIVE-5358:
------------------------------
Attachment: D13113.1.patch
chenchun requested code review of "HIVE-5358 [jira] ReduceSinkDeDuplication
should ignore column orders when check overlapping part of keys between parent
and child".
Reviewers: JIRA
HIVE-5358
select key, value from (select key, value from src group by key, value) t group
by key, value;
This can be optimized by ReduceSinkDeDuplication
select key, value from (select key, value from src group by key, value) t group
by value, key;
However the sql above can't be optimized by ReduceSinkDeDuplication currently
due to different column orders of parent and child operator.
TEST PLAN
EMPTY
REVISION DETAIL
https://reviews.facebook.net/D13113
AFFECTED FILES
ql/src/java/org/apache/hadoop/hive/ql/optimizer/correlation/ReduceSinkDeDuplication.java
ql/src/java/org/apache/hadoop/hive/ql/plan/ExprNodeColumnListDesc.java
ql/src/test/queries/clientpositive/reduce_deduplicate_extended.q
ql/src/test/results/clientpositive/reduce_deduplicate_extended.q.out
MANAGE HERALD RULES
https://reviews.facebook.net/herald/view/differential/
WHY DID I GET THIS EMAIL?
https://reviews.facebook.net/herald/transcript/38295/
To: JIRA, chenchun
> ReduceSinkDeDuplication should ignore column orders when check overlapping
> part of keys between parent and child
> ----------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-5358
> URL: https://issues.apache.org/jira/browse/HIVE-5358
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Chun Chen
> Assignee: Chun Chen
> Attachments: D13113.1.patch, HIVE-5358.patch
>
>
> {code}
> select key, value from (select key, value from src group by key, value) t
> group by key, value;
> {code}
> This can be optimized by ReduceSinkDeDuplication
> {code}
> select key, value from (select key, value from src group by key, value) t
> group by value, key;
> {code}
> However the sql above can't be optimized by ReduceSinkDeDuplication currently
> due to different column orders of parent and child operator.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
