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https://issues.apache.org/jira/browse/FLINK-39287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18068262#comment-18068262
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Xuyang Zhong commented on FLINK-39287:
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Merged into master: 370a8870450e4cd827c5fd1c4aacef551c15193e
> Introduce FlinkRelMdImmutableColumns to implement the derivation logic of
> some simple nodes
> -------------------------------------------------------------------------------------------
>
> Key: FLINK-39287
> URL: https://issues.apache.org/jira/browse/FLINK-39287
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / Planner
> Affects Versions: 2.3.0
> Reporter: Xuyang Zhong
> Assignee: Xuyang Zhong
> Priority: Major
> Fix For: 2.3.0
>
>
> # Introduce FlinkRelMdImmutableColumns to implement the derivation logic of
> some simple nodes
> # Update the logic about join to infer upsert key with immutable columns in
> FlinkRelMdUniqueKeys
> Note: this Jira will not implement the derivation logic for all operators;
> this part will be driven by subsequent Jiras.
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