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https://issues.apache.org/jira/browse/HIVE-348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12733835#action_12733835
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Zheng Shao commented on HIVE-348:
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I think we should pass type information in the environment variable.
> Provide type information to custom mappers and reducers.
> --------------------------------------------------------
>
> Key: HIVE-348
> URL: https://issues.apache.org/jira/browse/HIVE-348
> Project: Hadoop Hive
> Issue Type: Improvement
> Reporter: Venky Iyer
>
> Either by setting an environment variable with the schema, or (ideally),
> configurably passing JSON data to custom mappers/reducers. This would be more
> data to pump into the pipe on each mapper/reducer, but it would be generated
> on the mapper/reducer, and it may mean much less processing for the custom
> script (using a fast json library compared to casting each column that needs
> casting based on the schema).
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