Github user StephanEwen commented on the pull request:
https://github.com/apache/incubator-flink/pull/4#issuecomment-46659389
To make sure it does not matter whether you are looking at a two-byte char
or a three byte char, you can do the following: If the three byte chars are
always sorted higher than the two byte chars, then we can use an encoding
where the indicating bits for three byte chars are large than those for two
byte chars.
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