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https://issues.apache.org/jira/browse/FLINK-13433?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated FLINK-13433:
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Labels: pull-request-available (was: )
> 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
> Labels: pull-request-available
> Attachments: LookupJoinITCase.scala
>
>
> 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`.
> I add some testcases in
> `org.apache.flink.table.planner.runtime.stream.sql.LookupJoinITCase`, the
> results are all unexpected.
> More detail cases could be find in patch.
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