Github user fhueske commented on the pull request:
https://github.com/apache/flink/pull/905#issuecomment-121286738
Hi, thanks for the pull request.
I noticed that the `CollectionDataSets.getStringDataSet` data set does not
contain any duplicates. Therefore, it is not well suited to test the distinct
operator.
There also a few more tests for the Distinct operator that need to be
adapted:
- DistinctITCase.java
- DistinctOperatorTest.java
- DistinctOperatorTest.scala
The Unit tests (*Test) check if correct arguments are accepted and invalid
arguments are rejected. It would be nice, if you could try to do a distinct()
on a DataSet<YourObject>, where YourObject is not a Pojo but a generic type
which does not implement `Comparable`, i.e., it is not a Key type.
Thank you, Fabian
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