Github user fhueske commented on the pull request:
https://github.com/apache/flink/pull/1465#issuecomment-170921788
The `NullAwareComparator` knows about the order of its wrapped comparator.
So we can implement the `getFlatComparators()` method of `NullAwareComparator`,
call `getFlatComparators()` on the wrapped comparator and wrap each returned
comparator again in a `NullAwareComparator` with the same order as the wrapping
one. I think that should work, but maybe I am overlooking something here...
IMO, the problem with `isAscending()` is that it is only implemented for
BasicTypes (Int, String, etc.) but not for other atomic types such as generic
or writable types.
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