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https://issues.apache.org/jira/browse/FLINK-13509?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jark Wu reassigned FLINK-13509:
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Assignee: Jing Zhang
> Support `is not distinct from ` and similar syntax in LookupJoin
> ----------------------------------------------------------------
>
> Key: FLINK-13509
> URL: https://issues.apache.org/jira/browse/FLINK-13509
> Project: Flink
> Issue Type: Task
> Components: Table SQL / Planner
> Affects Versions: 1.10.0
> Reporter: Jing Zhang
> Assignee: Jing Zhang
> Priority: Minor
> Fix For: 1.10.0
>
>
> Example1:
> {code:java}
> `SELECT T.id, T.len, T.content, D.name FROM T JOIN userTable for system_time
> as of T.proctime AS D ON T.id = D.id OR (T.id is null and D.id is null)`
> {code}
> Example2:
> {code:java}
> "SELECT T.id, T.len, T.content, D.name FROM T JOIN userTable for system_time
> as of T.proctime AS D ON T.id IS NOT DISTINCT FROM D.id"
> {code}
> Now run the above sql in Blink planner, the results are not expected.Because
> LookupJoin does not handle the case correctly.
> Here is plan:
> In 1.9 version, simply throw exception in compile phase for the above sql.
> Support the feature in 1.10 version.
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