hive-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Hari Sankar Sivarama Subramaniyan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-5771) Constant propagation optimizer for Hive
Date Tue, 22 Apr 2014 22:34:15 GMT

    [ https://issues.apache.org/jira/browse/HIVE-5771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13977566#comment-13977566
] 

Hari Sankar Sivarama Subramaniyan commented on HIVE-5771:
---------------------------------------------------------

Hi [~tedxu]  I have a  minor comment on the implementation.
Is there a reason for these rules sharing same val.
+    opRules.put(new RuleRegExp("R5", "UNION%"), ConstantPropagateProcFactory
+        .getUnionProc());
+    opRules.put(new RuleRegExp("R5", "RS%"), ConstantPropagateProcFactory
+        .getReduceSinkProc());

Thanks
Hari

> Constant propagation optimizer for Hive
> ---------------------------------------
>
>                 Key: HIVE-5771
>                 URL: https://issues.apache.org/jira/browse/HIVE-5771
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Ted Xu
>            Assignee: Ted Xu
>         Attachments: HIVE-5771.1.patch, HIVE-5771.2.patch, HIVE-5771.3.patch, HIVE-5771.4.patch,
HIVE-5771.5.patch, HIVE-5771.6.patch, HIVE-5771.7.patch, HIVE-5771.8.patch, HIVE-5771.patch
>
>
> Currently there is no constant folding/propagation optimizer, all expressions are evaluated
at runtime. 
> HIVE-2470 did a great job on evaluating constants on UDF initializing phase, however,
it is still a runtime evaluation and it doesn't propagate constants from a subquery to outside.
> It may reduce I/O and accelerate process if we introduce such an optimizer.



--
This message was sent by Atlassian JIRA
(v6.2#6252)

Mime
View raw message