[jira] [Created] (FLINK-7800) Enable window joins without equi-join predicates

[Shang Yuanchun (Jira)]

Fabian Hueske created FLINK-7800:
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             Summary: Enable window joins without equi-join predicates
                 Key: FLINK-7800
                 URL: https://issues.apache.org/jira/browse/FLINK-7800
             Project: Flink
          Issue Type: Sub-task
          Components: Table API & SQL
    Affects Versions: 1.4.0
            Reporter: Fabian Hueske


Currently, windowed joins can only be translated if they have at least on equi-join predicate. This limitation exists due to the lack of a good cross join strategy for the DataSet API.

Due to the window, windowed joins do not have to be executed as cross joins. Hence, the equi-join limitation does not need to be enforces (even though non-equi joins are executed with a parallelism of 1 right now).

We can resolve this issue by adding a boolean flag to the {{FlinkLogicalJoinConverter}} rule to permit non-equi joins and add such a rule to the logical optimization set of the DataStream API.



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