Github user rtudoran commented on the issue:
https://github.com/apache/flink/pull/3609
@fhueske @twalthr @sunjincheng121 @shijinkui @stefanobortoli @hongyuhong
I have made a first implementation draft for supporting inner queries
mainly when operating on processing time. I would highly appreciate some
feedback from you to further enhance the approach.
The idea of the implementation is described in
https://issues.apache.org/jira/browse/FLINK-6073?filter=-2
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