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https://issues.apache.org/jira/browse/DRILL-35?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on DRILL-35 stopped by Timothy Chen.
> Implement RunningAggregate Reference Operator
> ---------------------------------------------
>
> Key: DRILL-35
> URL: https://issues.apache.org/jira/browse/DRILL-35
> Project: Apache Drill
> Issue Type: New Feature
> Reporter: Timothy Chen
> Assignee: Timothy Chen
> Labels: logical
>
> RunningAggregate (1)
> The running aggregate operator takes an input record and adds appends a set
> of running aggregations and outputs the resulting record. The aggregations
> are re-evaluated on each record within the incoming segment in the order they
> are provided. Segment focus can be defined with the ‘within’ value such that
> aggregations are reset at each segment boundary.
> { @id†: <opref>, op: “runningaggregate”,
> input†: <input>,
> within*: <name>,
> aggregations: [
> {ref: <name>, expr: <aggexpr> },...
> ]
> }
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