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https://issues.apache.org/jira/browse/FLINK-8838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16479192#comment-16479192
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ASF GitHub Bot commented on FLINK-8838:
---------------------------------------

Github user lincoln-lil commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5619#discussion_r188988362
  
    --- Diff: 
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/rules/logical/LogicalUnnestRule.scala
 ---
    @@ -104,7 +109,7 @@ class LogicalUnnestRule(
                     ImmutableList.of(new RelDataTypeFieldImpl("f0", 0, 
componentType)))
                 case _: RelRecordType => componentType
                 case _ => throw TableException(
    -              s"Unsupported array component type in UNNEST: 
${componentType.toString}")
    --- End diff --
    
    Yes,  `multiset` shouldn't  appear.


> Add Support for UNNEST a MultiSet type field
> --------------------------------------------
>
>                 Key: FLINK-8838
>                 URL: https://issues.apache.org/jira/browse/FLINK-8838
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API & SQL
>            Reporter: lincoln.lee
>            Assignee: lincoln.lee
>            Priority: Major
>
> MultiSetTypeInfo was introduced by  FLINK-7491, and UNNEST support Array type 
> only,  so it would be nice to support UNNEST a MultiSet type field.



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