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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