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https://issues.apache.org/jira/browse/BEAM-2747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16121906#comment-16121906
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Xu Mingmin commented on BEAM-2747:
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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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