hive-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-9140) Add ReduceExpressionRules from Calcite into Hive
Date Wed, 17 Dec 2014 17:39:14 GMT

    [ https://issues.apache.org/jira/browse/HIVE-9140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14250183#comment-14250183
] 

Ashutosh Chauhan commented on HIVE-9140:
----------------------------------------

[~jpullokkaran] Can you take a look at this one? I initially thought its better to have it
in applyPreCBOTransformations() but than I realized that our join ordering algorithm leaves
{where true} predicates while optimizing tree. Since, it will be good to remove such predicates,
I have added these rules alongwith join ordering rules.  Let me know what do you think.

> Add ReduceExpressionRules from Calcite into Hive
> ------------------------------------------------
>
>                 Key: HIVE-9140
>                 URL: https://issues.apache.org/jira/browse/HIVE-9140
>             Project: Hive
>          Issue Type: Improvement
>          Components: CBO, Logical Optimizer
>    Affects Versions: 0.14.0
>            Reporter: Ashutosh Chauhan
>            Assignee: Ashutosh Chauhan
>         Attachments: HIVE-9140.patch
>
>
> These rules provide a form of constant folding.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message