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Posted to dev@hive.apache.org by "Adam Kramer (Created) (JIRA)" <ji...@apache.org> on 2011/10/04 20:03:33 UTC

[jira] [Created] (HIVE-2480) UDAF: Multiple iterator() functions not respected

UDAF: Multiple iterator() functions not respected
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                 Key: HIVE-2480
                 URL: https://issues.apache.org/jira/browse/HIVE-2480
             Project: Hive
          Issue Type: Bug
            Reporter: Adam Kramer
            Priority: Minor


The UDAF function allows definition of an iterator() function. In keeping with how Java works and how the UDF (non-aggregating) structure works, multiple iterator() functions should be definable for different functionality of the same function (especially for something like defining defaults).

Multiple methods for a single UDAF is currently possible via definition of multiple Evaluators, but that is overkill for the "defining defaults" case. Overloading functions is also a standard practice in Java, so the fact that Hive silently disallows this is actually a bug. Further, the manner by which Hive ignores this (publishing only the last iterator defined in the file) is buggy, potentially inconsistent, and wholly undocumented.

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