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Posted to issues@flink.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/10/29 07:26:00 UTC

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

     [ https://issues.apache.org/jira/browse/FLINK-19874?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated FLINK-19874:
-----------------------------------
    Labels: pull-request-available  (was: )

> 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
>            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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