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https://issues.apache.org/jira/browse/CALCITE-1867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16236822#comment-16236822
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Julian Hyde commented on CALCITE-1867:
--------------------------------------
Fixed in http://git-wip-us.apache.org/repos/asf/calcite/commit/814de232; thanks
for the PR, [~twalthr]!
I renamed {{SqlGroupFunction}} to {{SqlGroupedWindowFunction}} and moved it to
the {{org.apache.calcite.sql}} package.
> 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
>
> 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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