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From "John Sichi (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-1457) improve diagnostics for incorrectly written UDAF implementations
Date Sat, 10 Jul 2010 01:48:49 GMT
improve diagnostics for incorrectly written UDAF implementations

                 Key: HIVE-1457
                 URL: https://issues.apache.org/jira/browse/HIVE-1457
             Project: Hadoop Hive
          Issue Type: Bug
          Components: UDF
    Affects Versions: 0.6.0
            Reporter: John Sichi
            Assignee: John Sichi
             Fix For: 0.7.0

For both reflective and generic UD(A)F, I've noticed cases where an incorrectly written Java
class will cause UDF creation or execution to fail, but with poor diagnostics (e.g. NPE or
non-obvious Java reflective exception), requiring the user to guess what the problem is by
comparison with a working class.

Specific examples to follow; I think I have seen the following cases:

* incorrect accessibility on a class or method (e.g. private instead of public)
* missing no-arg constructor
* incorrect method return type

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