Github user rtudoran commented on the issue:
https://github.com/apache/flink/pull/3783
@fhueske @stefanobortoli
I recently fixed in Calcite the problem of porting distinct flag to the the
over. This was merged in the master. Hence it is a matter of when flink will
get the new calcite version. We can also consider the temporary solution IMHO
until then
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