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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-651) cleanup for group by in semanticanalyzer
Date Fri, 17 Jul 2009 17:19:14 GMT
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

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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