Provide type information to custom mappers and reducers.
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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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