Github user fhueske commented on the pull request:
https://github.com/apache/flink/pull/525#issuecomment-85499509
Yes, I agree. The fix is more conservative than necessary.
I think we can safely relax it if we make the rule for forwarded fields on
group-wise operators as follows:
*"All forwarded fields of an emitted record must be forwarded from the same
input record. Each output record can have forwarded values from a different
input record."*
This allows to preserve partitionings (also on composite keys) but voids
all grouping / sorting on non-key fields because the order of the emitted
records is not specified.
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