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https://issues.apache.org/jira/browse/CALCITE-5704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17723260#comment-17723260
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Julian Hyde commented on CALCITE-5704:
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These should be functions in {{SqlLibraryOperators}}, but should desugar to
operators such as {{ARRAY_UNION}} in {{SqlStdOperatorTable}}. Such operators
should be in {{SqlStdOperatorTable}} because {{ARRAY UNION}} etc. are defined
in the SQL standard. They are not currently implemented, but very similar
operators {{SqlStdOperatorTable.MULTISET_UNION}} were added already (in
CALCITE-2355).
> Add ARRAY_EXCEPT, ARRAY_INTERSECT and ARRAY_UNION for Spark dialect
> -------------------------------------------------------------------
>
> Key: CALCITE-5704
> URL: https://issues.apache.org/jira/browse/CALCITE-5704
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.35.0
> Reporter: jackylau
> Priority: Major
> Fix For: 1.35.0
>
>
> array_union(array1, array2) - Returns an array of the elements in the union
> of array1 and array2, without duplicates.
> array_intersect(array1, array2) - Returns an array of the elements in the
> intersection of array1 and array2, without duplicates.
> array_except(array1, array2) - Returns an array of the elements in array1 but
> not in array2, without duplicates.
> For more details
> [https://spark.apache.org/docs/latest/api/sql/index.html]
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