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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-1) [hive] redundant expression evaluation in group by stage 1
Date Thu, 17 Dec 2009 23:06:19 GMT

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

Namit Jain updated HIVE-1:
--------------------------

    Issue Type: Improvement  (was: Bug)

> [hive] redundant expression evaluation in group by stage 1
> ----------------------------------------------------------
>
>                 Key: HIVE-1
>                 URL: https://issues.apache.org/jira/browse/HIVE-1
>             Project: Hadoop 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

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