Xu Mingmin commented on BEAM-2747:

You're right [~xumingming], it's doable to copy `AggregationFunctionImpl` given 
that `public AggImplementor getImplementor(boolean windowContext)` is not 
actually used in Beam SQL(That method has lots of dependencies but we only use 
the parser of Calcite).

> accept CombineFn as UDAF
> ------------------------
>                 Key: BEAM-2747
>                 URL: https://issues.apache.org/jira/browse/BEAM-2747
>             Project: Beam
>          Issue Type: Sub-task
>          Components: dsl-sql
>            Reporter: Xu Mingmin
>            Assignee: Xu Mingmin
>              Labels: dsl_sql_merge, dsl_sql_review
> refer to 
> https://docs.google.com/document/d/1VlAqKLhQua6YpR42KuziIYHTB1FfQTi16Mh88MEYBsU/edit?disco=AAAABTmjhgo

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