You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@flink.apache.org by "Fabian Hueske (JIRA)" <ji...@apache.org> on 2017/10/10 21:47:00 UTC
[jira] [Created] (FLINK-7800) Enable window joins without equi-join
predicates
Fabian Hueske created FLINK-7800:
------------------------------------
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.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)