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https://issues.apache.org/jira/browse/HIVE-256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12668339#action_12668339
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Ashish Thusoo commented on HIVE-256:
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>From what Namit told me, there were 3 bugs:
1. aggrPositions was not being initialized so we were not tracking the variable
length fields properly.
2. Instead of getFields he had to use getDeclaredFields as the former only
gives public fields where as most of our fields are private.
3. The numEntries stuff which would not let the code kick in if there were less
thatn NUMROWESTIMATESIZE of rows...
We had used 256 as a heuristic for unknown types...
> 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
> Fix For: 0.2.0
>
> Attachments: patch-256.1.txt
>
>
> map side aggregation : number of output rows is same as number of input rows
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