[jira] [Created] (FLINK-19874) Apply JoinDeriveNullFilterRule after join reorder

[Shang Yuanchun (Jira)]

Caizhi Weng created FLINK-19874:
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             Summary: 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
             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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