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https://issues.apache.org/jira/browse/FLINK-21949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17337051#comment-17337051
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Jark Wu commented on FLINK-21949:
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Thanks [~jiabao.sun], the {{collect_list}} and {{collect_set}} sounds good to
me.
[~Sergey Nuyanzin] is designing built-in functions related to collections,
would be great to hear opinions from him.
> Support collect to array aggregate function
> -------------------------------------------
>
> Key: FLINK-21949
> URL: https://issues.apache.org/jira/browse/FLINK-21949
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / API
> Affects Versions: 1.12.0
> Reporter: jiabao sun
> Priority: Minor
>
> Some nosql databases like mongodb and elasticsearch support nested data types.
> Aggregating multiple rows into ARRAY<ROW> is a common requirement.
> The CollectToArray function is similar to Collect, except that it returns
> ARRAY<ROW> instead of MULTISET<ROW>.
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