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https://issues.apache.org/jira/browse/HIVE-651?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ning Zhang reassigned HIVE-651:
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Assignee: Ning Zhang
> cleanup for group by in semanticanalyzer
> ----------------------------------------
>
> Key: HIVE-651
> URL: https://issues.apache.org/jira/browse/HIVE-651
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Ning Zhang
>
> The code in semantic analyzer is getting pretty complex. There are many
> functions which do similar stuff and it becoming painful to debug these
> scenarios.
> It would be useful to break up that code into smaller modules, which will
> make it more readable.
> Some common pieces which can be factored out are as follows:
> 1. Resolution of the aggregation function - this can happen before any group
> by, and is independent of whether distinct or non-distinct aggregation is
> being performed.
> 2. After the resolution, a mode can be passed which indicates whether partial
> aggregation is required or not.
> Some more detailed inspection of the code is needed, but the amount of common
> code can be refactored and reduced.
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