[jira] [Commented] (HIVE-4209) Cache evaluation result of deterministic expression and reuse it

["Phabricator (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-4209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13640354#comment-13640354 ] 

Phabricator commented on HIVE-4209:
-----------------------------------

njain has commented on the revision "HIVE-4209 [jira] Cache evaluation result of deterministic expression and reuse it".

  Can you change the default to true ?
  In hive-default.xml.template, can you explain the types of queries/expressions that will benefit

INLINE COMMENTS
  common/src/java/org/apache/hadoop/hive/conf/HiveConf.java:638 Can you explain this new parameter in hive-default.xml.template ?

REVISION DETAIL
  https://reviews.facebook.net/D9585

To: JIRA, navis
Cc: njain

                
> Cache evaluation result of deterministic expression and reuse it
> ----------------------------------------------------------------
>
>                 Key: HIVE-4209
>                 URL: https://issues.apache.org/jira/browse/HIVE-4209
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Navis
>            Assignee: Navis
>            Priority: Minor
>         Attachments: HIVE-4209.D9585.1.patch, HIVE-4209.D9585.2.patch, HIVE-4209.D9585.3.patch, HIVE-4209.D9585.4.patch
>
>
> For example, 
> {noformat}
> select key from src where key + 1 > 100 AND key + 1 < 200 limit 3;
> {noformat}
> key + 1 need not to be evaluated twice.

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