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https://issues.apache.org/jira/browse/FLINK-21949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17730964#comment-17730964
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Martijn Visser commented on FLINK-21949:
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Given that ARRAY_AGG was added in Calcite 1.27 via CALCITE-4335 I hope that
implementing it should be straightforward, since Flink is on a later version of
Calcite already.
[~rolandjohann] Are you still willing to work on this? If so, perhaps [~Sergey
Nuyanzin] and/or [~twalthr] could provide some guidance.
> 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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