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https://issues.apache.org/jira/browse/CALCITE-565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17501947#comment-17501947
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shampoo liu commented on CALCITE-565:
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any progress on this task ?
> Implement windowed aggregate in interpreter
> -------------------------------------------
>
> Key: CALCITE-565
> URL: https://issues.apache.org/jira/browse/CALCITE-565
> Project: Calcite
> Issue Type: Sub-task
> Reporter: Julian Hyde
> Priority: Major
>
> Implement windowed aggregate (the Window relational expression) in the
> interpreter.
> Aggregate functions could be implemented by generating Java ASTs (via
> AggImplementor) but it would be simpler to implement them using
> AggregateFunctionImpl, as if they were user-defined aggregates.
> (AggregateNode already does this.)
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