[
https://issues.apache.org/jira/browse/HIVE-5358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13797688#comment-13797688
]
Chun Chen commented on HIVE-5358:
---------------------------------
review https://reviews.facebook.net/D13509
> 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-5358.2.patch, HIVE-5358.3.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 was sent by Atlassian JIRA
(v6.1#6144)
