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https://issues.apache.org/jira/browse/FLINK-4542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16517283#comment-16517283
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Timo Walther commented on FLINK-4542:
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Hi [~Sergey Nuyanzin],
I thought Calcite has support (at least parsing and validation) for the
operations mentioned in the issue, because they are listed in
{{org.apache.calcite.sql.fun.SqlStdOperatorTable}}. The multiset type is
supported in Flink SQL (this as been introduced as part of FLINK-7491).
However, creating literals using {{SELECT MULTISET(...)}} is not. For this we
need to implement the value constructor call
{{SqlStdOperatorTable.MULTISET_VALUE}}. I hope Calcite is releasing 1.17 soon
that we are not blocked on this. Feel free to split this issue in multiple
subtasks and open PRs for functions that we can already support and functions
that are blocked.
> 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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