Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/1983
I think the code looks good.
There are no tests so far, though. I am wondering if some would help to
catch copy/paste errors.
It is very easy to write comparator tests simply extending the
`ComparatorTestBase`.
For the future: I am wondering if we can "generate" these serializers and
comparators somehow (and their test classes), like we do for the tuple classes.
Writing them seems like very repetitive work.
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