Github user greghogan commented on the issue:
https://github.com/apache/flink/pull/3392
This change also effects running in a cluster environment where the UDF
requests multiple iterators but accepts that the same iterator is returned, as
in the modified test.
Since this only affects the batch API, since 2.0 may be a ways off, and
since the changed behavior throws an exception I'm in favor of making the
change in 1.3.
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