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Posted to dev@hive.apache.org by "Ashish Thusoo (JIRA)" <ji...@apache.org> on 2008/12/01 17:59:44 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 ]
Ashish Thusoo updated HIVE-1:
-----------------------------
Component/s: Query Processor
> [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: Bug
> 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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