Github user fhueske commented on the pull request:
https://github.com/apache/flink/pull/1465#issuecomment-170916212
Hi Timo, the PR looks good except for the `extractKeys` and
`getFlatComparator` methods. I think it is possible to support composite type
wrapping with the `NullAwareComparator` but we need to take care of composite
types in `extractKeys` and `getFlatComparators`.
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