Document GenericUD(A|T)F
------------------------

                 Key: HIVE-2085
                 URL: https://issues.apache.org/jira/browse/HIVE-2085
             Project: Hive
          Issue Type: Improvement
          Components: Documentation
            Reporter: Lars Francke
            Priority: Minor


GenericUDFs are very poorly documented, this includes everything they relate to:

  * ObjectInspector (JavaDoc not really helpful for someone not familiar with 
Hive)
  * ObjectInspectorFactory
  * ObjectInspectorConverters
  * ...

An example would help as well as a unit test for one of the built in 
GenericUDFs. Writing a normal UDF is pretty well documented but GenericUDFs 
(and UDTF/UDAF) require more knowledge about the inner workings of Hive and 
that could be documented better.

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