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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