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Posted to common-dev@hadoop.apache.org by "Namit Jain (JIRA)" <ji...@apache.org> on 2008/09/11 03:34:44 UTC

[jira] Assigned: (HADOOP-4157) [hive] redundant expression evaluation in group by stage 1

     [ https://issues.apache.org/jira/browse/HADOOP-4157?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Namit Jain reassigned HADOOP-4157:
----------------------------------

    Assignee: Namit Jain

> [hive] redundant expression evaluation in group by stage 1
> ----------------------------------------------------------
>
>                 Key: HADOOP-4157
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4157
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/hive
>            Reporter: Namit Jain
>            Assignee: 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

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