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https://issues.apache.org/jira/browse/FLINK-4542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16573128#comment-16573128
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Timo Walther commented on FLINK-4542:
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[~Sergey Nuyanzin] we upgraded to Calcite 1.17. So you could continue your
efforts here, if you find time. Thank you.
> Add MULTISET operations
> -----------------------
>
> Key: FLINK-4542
> URL: https://issues.apache.org/jira/browse/FLINK-4542
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Timo Walther
> Assignee: Sergey Nuyanzin
> Priority: Minor
>
> Umbrella issue for MULTISET operations like:
> MULTISET UNION, MULTISET UNION ALL, MULTISET EXCEPT, MULTISET EXCEPT ALL,
> MULTISET INTERSECT, MULTISET INTERSECT ALL, CARDINALITY, ELEMENT, MEMBER OF,
> SUBMULTISET OF, IS A SET, FUSION
> At the moment we only support COLLECT.
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