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https://issues.apache.org/jira/browse/FLINK-39779?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Fabian Hueske reassigned FLINK-39779:
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Assignee: Fabian Hueske
> FLIP-579: LATERAL SNAPSHOT Join
> -------------------------------
>
> Key: FLINK-39779
> URL: https://issues.apache.org/jira/browse/FLINK-39779
> Project: Flink
> Issue Type: New Feature
> Components: Table SQL / API, Table SQL / Planner, Table SQL / Runtime
> Reporter: Fabian Hueske
> Assignee: Fabian Hueske
> Priority: Major
>
> Add new LATERAL SNAPSHOT Join to support processing-time temporal table joins.
> This feature consists of the following tasks
> * make TABLE keyword optional in LATERAL contexts
> * add built-in SNAPSHOT function definition to specify temporal table joins
> in SQL with a built-in (temporal) table function.
> * add implementation of new join operator for processing-time temporal table
> joins with improved semantics
> ** initialization phase to prevent early joining
> ** immediate joining after initialization (no dependency on build-side WMs)
> ** atomic application of update changes (U- and U+)
> * add optimization rules to translate LATERAL call of SNAPSHOT function into
> new join operator and prevent usage of SNAPSHOT outside of LATERAL context
> * end-to-end tests to ensure correctness of join
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