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https://issues.apache.org/jira/browse/DRILL-22?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13998967#comment-13998967
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Jacques Nadeau commented on DRILL-22:
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Resolved some time ago by StreamAgg
> Aggregation of entire stream should be possible by specifying empty list of
> keys
> --------------------------------------------------------------------------------
>
> Key: DRILL-22
> URL: https://issues.apache.org/jira/browse/DRILL-22
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Ted Dunning
> Assignee: Jacques Nadeau
>
> The aggregate operator should support an empty list of keys to allow
> aggregation across the entire input something like this:
> {code}
> { op: "aggregate", type: "simple", keys: [],
> aggregations: [ref: "average", expr: "AVG(y)"]}
> {code}
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