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https://issues.apache.org/jira/browse/FLINK-33765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17794070#comment-17794070
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Martijn Visser commented on FLINK-33765:
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[~zhenzhongxu] Please take a look at FLINK-21949 - We should support ARRAY_AGG,
not COLLECT_LIST (but the idea is the same)
> Flink SQL to support COLLECT_LIST
> ---------------------------------
>
> Key: FLINK-33765
> URL: https://issues.apache.org/jira/browse/FLINK-33765
> Project: Flink
> Issue Type: Improvement
> Components: API / DataSet
> Reporter: Zhenzhong Xu
> Priority: Major
>
> Flink SQL currently supports COLLECT, which returns a multiset, however,
> given support for casting from multiset to other types (especially
> array/list) is *very* limited, see
> [here,|https://github.com/apache/flink/blob/master/docs/content/docs/dev/table/types.md#casting]
> this is creating lots of headaches for ease of use.
> Can we support COLLECT_LIST as a built-in system function? (I believe Spark
> supports it)
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