[jira] [Created] (FLINK-21949) Support collect to array aggregate function

[Shang Yuanchun (Jira)]

jiabao sun created FLINK-21949:
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             Summary: Support collect to array aggregate function
                 Key: FLINK-21949
                 URL: https://issues.apache.org/jira/browse/FLINK-21949
             Project: Flink
          Issue Type: Improvement
          Components: Build System / Stateful Functions, Table SQL / Planner
    Affects Versions: 1.12.0
            Reporter: jiabao sun


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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