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Posted to issues@flink.apache.org by "Jark Wu (JIRA)" <ji...@apache.org> on 2019/07/26 09:52:00 UTC

[jira] [Assigned] (FLINK-13433) Do not fetch data from LookupableTableSource if the JoinKey in left side of LookupJoin contains null value

     [ https://issues.apache.org/jira/browse/FLINK-13433?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jark Wu reassigned FLINK-13433:
-------------------------------

    Assignee: Jing Zhang

> Do not fetch data from LookupableTableSource if the JoinKey in left side of LookupJoin contains null value
> ----------------------------------------------------------------------------------------------------------
>
>                 Key: FLINK-13433
>                 URL: https://issues.apache.org/jira/browse/FLINK-13433
>             Project: Flink
>          Issue Type: Task
>          Components: Table SQL / Planner
>    Affects Versions: 1.9.0, 1.10.0
>            Reporter: Jing Zhang
>            Assignee: Jing Zhang
>            Priority: Minor
>             Fix For: 1.10.0
>
>
> For LookupJoin, if joinKey in left side of a LeftOuterJoin/InnerJoin contains null values, there is no need to fetch data from `LookupableTableSource`. 
> However, we don't shortcut the fetch function under the case at present, the correctness of results depends on the `TableFunction` implementation of  each `LookupableTableSource`.



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