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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-256) map side aggregation : number of output rows is same as number of input rows
Date Thu, 29 Jan 2009 03:02:59 GMT

    [ https://issues.apache.org/jira/browse/HIVE-256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12668301#action_12668301
] 

Namit Jain commented on HIVE-256:
---------------------------------

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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