[jira] Assigned: (HIVE-348) Provide type information to custom mappers and reducers.

["Ning Zhang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-348?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ning Zhang reassigned HIVE-348:
-------------------------------

    Assignee:     (was: Ning Zhang)

> 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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