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https://issues.apache.org/jira/browse/FLINK-7491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16143104#comment-16143104
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Jark Wu commented on FLINK-7491:
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Hi [~suez1224] , what I mean use {{Array}} instead of {{AbstractMultiSet}} is
the runtime type, not sql type. For sql type, of course we should use the
{{MultisetSqlType}}. But for the runtime type, you are using a guava
{{AbstractMultiSet}} (collect elements into the AbstractMultiSet) which I think
is poor performance, and I think maybe a Java array is enough for this. Calcite
MultisetSqlType doesn't force us to use which Java type in runtime.
> Support COLLECT Aggregate function in Flink SQL
> -----------------------------------------------
>
> Key: FLINK-7491
> URL: https://issues.apache.org/jira/browse/FLINK-7491
> Project: Flink
> Issue Type: New Feature
> Components: Table API & SQL
> Reporter: Shuyi Chen
> Assignee: Shuyi Chen
>
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