[
https://issues.apache.org/jira/browse/HIVE-948?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Phabricator updated HIVE-948:
-----------------------------
Attachment: HIVE-948.D8463.4.patch
navis updated the revision "HIVE-948 [jira] more query plan optimization rules".
Added missing class, sorry
Reviewers: ashutoshc, JIRA
REVISION DETAIL
https://reviews.facebook.net/D8463
CHANGE SINCE LAST DIFF
https://reviews.facebook.net/D8463?vs=27807&id=28257#toc
AFFECTED FILES
ql/src/java/org/apache/hadoop/hive/ql/optimizer/NonBlockingOpDeDupProc.java
ql/src/java/org/apache/hadoop/hive/ql/optimizer/Optimizer.java
ql/src/java/org/apache/hadoop/hive/ql/plan/ExprNodeDescUtils.java
ql/src/java/org/apache/hadoop/hive/ql/ppd/OpProcFactory.java
ql/src/java/org/apache/hadoop/hive/ql/ppd/PredicateTransitivePropagate.java
To: JIRA, ashutoshc, navis
> more query plan optimization rules
> -----------------------------------
>
> Key: HIVE-948
> URL: https://issues.apache.org/jira/browse/HIVE-948
> Project: Hive
> Issue Type: Improvement
> Reporter: Ning Zhang
> Assignee: Navis
> Attachments: HIVE-948.D8463.1.patch, HIVE-948.D8463.2.patch,
> HIVE-948.D8463.3.patch, HIVE-948.D8463.3.patch, HIVE-948.D8463.4.patch
>
>
> Many query plans are not optimal in that they contain redundant operators.
> Some examples are unnecessary select operators (select followed by select,
> select output being the same as input etc.). Even though these operators are
> not very expensive, they could account for around 10% of CPU time in some
> simple queries. It seems they are low-hanging fruits that we should pick
> first.
> BTW, it seems these optimization rules should be added at the last stage of
> the physical optimization phase since some redundant operators are added to
> facilitate physical plan generation.
--
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
