[jira] [Created] (FLINK-7996) Add support for (left.time = right.time) predicates to window join.

[Shang Yuanchun (Jira)]

Fabian Hueske created FLINK-7996:
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             Summary: Add support for (left.time = right.time) predicates to window join.
                 Key: FLINK-7996
                 URL: https://issues.apache.org/jira/browse/FLINK-7996
             Project: Flink
          Issue Type: Sub-task
          Components: Table API & SQL
    Affects Versions: 1.4.0
            Reporter: Fabian Hueske
            Priority: Critical
             Fix For: 1.4.0


A common operation is to join the result of two window aggregations on the same timestamp.

However, window joins do not support equality predicates on time attributes such as {{left.time = right.time}} but require two range predicates such as {{left.time >= right.time AND left.time <= right.time}}.

This can be fixed in the translation code (the operator does not have to be touched).



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