Github user fhueske commented on the pull request:
https://github.com/apache/flink/pull/1279#issuecomment-150163567
Regarding the PR itself:
The `ProjectOperator` class can be cleaned up a bit more. By removing the
two methods, the member variable `proj` becomes unused and the constructor with
the signature `public ProjectOperator(DataSet<IN> input, int[] fields,
TupleTypeInfo<OUT> returnType, Projection<IN> proj)` can be removed, if the
code generated by the `TupleGenerator` is adapted such that it does not use the
`Projection` anymore.
I am also OK with breaking the API, but we should do it now (with the 0.10
release), IMO.
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