[
https://issues.apache.org/jira/browse/HIVE-1?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Nauroth reassigned HIVE-1:
--------------------------------
Assignee: Carter Shanklin (was: Chris Nauroth)
> [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
> Assignee: Carter Shanklin
> Priority: Major
>
> 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
(v8.20.10#820010)
