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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