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https://issues.apache.org/jira/browse/SPARK-28580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16899773#comment-16899773
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Dongjoon Hyun commented on SPARK-28580:
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Please make a PR with a working implementation.
> ANSI SQL: unique predicate
> --------------------------
>
> Key: SPARK-28580
> URL: https://issues.apache.org/jira/browse/SPARK-28580
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: jiaan.geng
> Priority: Major
>
> Format
> {code:java}
> <unique predicate> ::=
> UNIQUE <table subquery>{code}
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