Github user wuchong commented on the issue:
https://github.com/apache/flink/pull/4585
Hi @suez1224 thanks for the PR, I think we can use `Array` instead of
`AbstractMultiSet`. `AbstractMultiSet` is too obscure for users. In that case,
we do not need the MultiSetSerilizer and MultiSetTypeInfo, also the following
queries can use UDF on the field with array type as the `evel(...)` parameters.
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