[jira] [Commented] (CALCITE-1867) Allow creating additional SqlGroupFunctions

["Julian Hyde (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-1867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16070395#comment-16070395 ] 

Julian Hyde commented on CALCITE-1867:
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Makes sense.

Before we make the APIs public (therefore permanent) I wish we could find a better name than "group function" (or "window function") because those names are taken.

> Allow creating additional SqlGroupFunctions
> -------------------------------------------
>
>                 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
>
> 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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