We’d like to add these, and there are JIRA cases logged, e.g. 
https://issues.apache.org/jira/browse/CALCITE-768 
<https://issues.apache.org/jira/browse/CALCITE-768>, but we have not committed 
to a particular timeline.

> On Sep 14, 2016, at 1:00 AM, Yuan,Youjun <yuanyou...@baidu.com> wrote:
> 
> Hi all,
> 
> I am working on a project to translate SQL into Flink stream API, and want to 
> leverage Calcite to do the parsing, validation and converting to RelNode.
> So my question is: is there a plan which release will Calcite support the 
> window functions, as introduced in 
> https://calcite.apache.org/docs/stream.html#tumbling-windows?
> 
> I know there are CEIL, FLOOR functions, but that seems not expressive enough 
> to express tumbling, sliding, session window syntax.
> 
> Thanks in advance!
> 
> Youjun Yuan

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