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https://issues.apache.org/jira/browse/FLINK-19874?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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godfrey he closed FLINK-19874.
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Resolution: Implemented
master: d0458aa649255a37bc2af7ddfeaea109abdac44a
> Apply JoinDeriveNullFilterRule after join reorder
> -------------------------------------------------
>
> Key: FLINK-19874
> URL: https://issues.apache.org/jira/browse/FLINK-19874
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Planner
> Reporter: Caizhi Weng
> Assignee: Caizhi Weng
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.12.0
>
>
> {{JoinDeriveNullFilterRule}} will filter out null join keys to prevent data
> skew for joins. Currently this rule is only applied before join reorder.
> After join reorder the join keys for some inputs might change and we need to
> apply this rule again.
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