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https://issues.apache.org/jira/browse/FLINK-15441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17328127#comment-17328127
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Flink Jira Bot commented on FLINK-15441:
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This major issue is unassigned and itself and all of its Sub-Tasks have not
been updated for 30 days. So, it has been labeled "stale-major". If this ticket
is indeed "major", please either assign yourself or give an update. Afterwards,
please remove the label. In 7 days the issue will be deprioritized.
> Refactor StreamExecWindowJoin to extends CommonPhysicalJoin
> -----------------------------------------------------------
>
> Key: FLINK-15441
> URL: https://issues.apache.org/jira/browse/FLINK-15441
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Planner
> Reporter: Jark Wu
> Priority: Major
> Labels: stale-major
>
> Currently, {{StreamExecWindowJoin}} put join keys in the {{remainCondition}},
> this will generate redundant condition for join keys, and results in [this
> code branch
> |https://github.com/apache/flink/blob/master/flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/planner/plan/utils/WindowJoinUtil.scala#L128]
> is never reached.
> I better desgin is have a new {{joinCondition}} which removes the window
> bounds condition, and generate condition for non-equal conditions in
> {{joinCondition}}, and make {{StreamExecWindowJoin}} extends
> {{CommonPhysicalJoin}} . We should also take filter null join keys into
> account.
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