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Posted to issues@flink.apache.org by "Zhenzhong Xu (Jira)" <ji...@apache.org> on 2023/12/06 19:47:00 UTC

[jira] [Created] (FLINK-33765) Flink SQL to support COLLECTLIST

Zhenzhong Xu created FLINK-33765:
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             Summary: Flink SQL to support COLLECTLIST
                 Key: FLINK-33765
                 URL: https://issues.apache.org/jira/browse/FLINK-33765
             Project: Flink
          Issue Type: Improvement
          Components: API / DataSet
            Reporter: Zhenzhong Xu


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?



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