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https://issues.apache.org/jira/browse/SPARK-38932?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17524052#comment-17524052
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Apache Spark commented on SPARK-38932:
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User 'ulysses-you' has created a pull request for this issue:
https://github.com/apache/spark/pull/36253
> Datasource v2 support report unique keys
> ----------------------------------------
>
> Key: SPARK-38932
> URL: https://issues.apache.org/jira/browse/SPARK-38932
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.4.0
> Reporter: XiDuo You
> Priority: Major
>
> Datasource v2 can be used to connect to some databases who support [*unique
> key*|https://en.wikipedia.org/wiki/Unique_key].
> Spark catalyst optimizer support do further optimization through unique keys.
> So it can improve the performance if the Scan reports its unique keys to
> Spark.
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