Github user fhueske commented on the pull request:
https://github.com/apache/flink/pull/1138#issuecomment-141111654
@jkovacs and @r-pogalz, thank you very much for this PR and the detailed
description!
It's quite a bit of code so it will take some time to be reviewed. I hope
to give feedback soon.
Nonetheless, we can start a discussion about the handling of projection for
outer joins. By changing the type information to `GenericTypeInfo<TupleX>` to
support tuples with null values, a `DataSet<TupleX>` cannot be used (in a join,
groupBy, reduce, ...) as before because the runtime will use completely
different serializers and comparators. Therefore, I am more in favor of not
supporting projection for outer joins.
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