Github user mliesenberg commented on the pull request:
https://github.com/apache/flink/pull/1097#issuecomment-158766866
yep, based on the discussion above with fabian the default value is set
only on the long key.
I'll go ahead and set it on the short key as well, if nothing else is
defined.
I think the issue above is something else though:
when a value is found for the short key, but not the long key, it is copied
to the long key and removed from the short key - also based on my understanding
of the discussion above. rereading it and seeing your use case, it is probably
better to drop the removal from the short key.
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