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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