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https://issues.apache.org/jira/browse/HIVE-256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12668301#action_12668301
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Namit Jain commented on HIVE-256:
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It is used to keep track of the aggregation classes using variable length
fields. There were few bugs there, which were getting hidden because the
reflection API getFields() only shows public fields, whereas
getDeclaredFields() shows all fields.
For example, max has a string variable whose size is not fixed, it is sampled
at runtime
> map side aggregation : number of output rows is same as number of input rows
> ----------------------------------------------------------------------------
>
> Key: HIVE-256
> URL: https://issues.apache.org/jira/browse/HIVE-256
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Namit Jain
> Attachments: patch-256.1.txt
>
>
> map side aggregation : number of output rows is same as number of input rows
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