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From "Ning Zhang (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (HIVE-651) cleanup for group by in semanticanalyzer
Date Thu, 23 Jul 2009 13:51:14 GMT

     [ https://issues.apache.org/jira/browse/HIVE-651?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ning Zhang reassigned HIVE-651:
-------------------------------

    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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