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https://issues.apache.org/jira/browse/CALCITE-1867?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde resolved CALCITE-1867.
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Resolution: Fixed
Fix Version/s: 1.15.0
> Allow user-defined SqlGroupedWindowFunction
> -------------------------------------------
>
> Key: CALCITE-1867
> URL: https://issues.apache.org/jira/browse/CALCITE-1867
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Timo Walther
> Assignee: Julian Hyde
> Priority: Major
> Fix For: 1.15.0
>
>
> In Flink we want to create additional group auxiliary functions (such as
> {{TUMBLE_ROWTIME(), TUMBLE_PROCTIME()}}).
> Unfortunately, {{SqlGroupFunction}} and its methods are package-private which
> prevents us from adding custom functions. Also {{AuxiliaryConverter}} limits
> because it is statically defined and not pluggable.
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