Github user greghogan commented on the issue:

    https://github.com/apache/flink/pull/3511
  
    @heytitle apologies for the long delay. I've been working to improve the 
Gelly examples to process with each of the standard data types (from byte to 
string). I think we can validate both the correctness and performance of this 
PR in time for the 1.4 release.
    
    Are you able to continue working on this feature? There are several steps 
to proceed with:
    - rebase to master
    - fix checkstyle warnings against the new "strict checkstyle"
    - implement code generation for `FixedLengthRecordSorter`
    
    Rather than extending `NormalizedKeySorter`, we could pull the compare and 
swap functions out of `MemorySegment` into an interface with a default 
implementation moved from `NormalizedKeySorter` and `FixedLengthRecordSorter`. 
There is overlap in that the `normalizedKeyFullyDetermines` case of 
`NormalizedKeySorter` results in the same operations as in 
`FixedLengthRecordSorter`.


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