You are viewing a plain text version of this content. The canonical link for it is here.

Posted to issues@hive.apache.org by "Carter Shanklin (JIRA)" <ji...@apache.org> on 2015/11/11 01:18:11 UTC

[jira] [Updated] (HIVE-1) [hive] redundant expression evaluation in group by stage 1

     [ https://issues.apache.org/jira/browse/HIVE-1?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Carter Shanklin updated HIVE-1:
-------------------------------
    Assignee:     (was: Carter Shanklin)

> [hive] redundant expression evaluation in group by stage 1
> ----------------------------------------------------------
>
>                 Key: HIVE-1
>                 URL: https://issues.apache.org/jira/browse/HIVE-1
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Namit Jain
>
> We can be smarter in terms of this list of what parameters we evaluate in the first stage, we should only evaluate those that are common across the group by clauses.
> All expressions and aggregation function parameters are evaluated in the first stage thereby increasing data flow. It might be better to only evaluate common expressions



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