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https://issues.apache.org/jira/browse/FLINK-19072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17215440#comment-17215440
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godfrey he commented on FLINK-19072:
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master: cd65bbb7cc2ec2099d70375cc009215cf57afe13
> Import Temporal Table join rule
> -------------------------------
>
> Key: FLINK-19072
> URL: https://issues.apache.org/jira/browse/FLINK-19072
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / Planner
> Reporter: Leonard Xu
> Assignee: Leonard Xu
> Priority: Major
> Labels: pull-request-available
>
> The initial temporal table join (FOR SYSTEM_TIME AS OF) is a Correlate, we
> need rewrite it into a Join to make join condition can be pushed-down. The
> join will be translated into [[StreamExecLookupJoin]] or
> [[StreamExecTemporalJoin]] in physical.
> Import Temporal table join rule to deal above temporal join rewrite logic.
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