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Comment: Removed incorrect mention of 2.0 - maybe it meant 0.2? Anyway, transform has been around in hive from before hive was an apache project (from when it was a sub-project of hadoop)

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Users can also plug in their own custom mappers and reducers in the data stream by using features natively supported in the Hive 2.0 language. e.g. in order to run a custom mapper script - map_script - and a custom reducer script - reduce_script - the user can issue the following command which uses the TRANSFORM clause to embed the mapper and the reducer scripts.

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