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https://issues.apache.org/jira/browse/IOTDB-452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17029818#comment-17029818
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Xiangdong Huang commented on IOTDB-452:
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I see. Make sense.
> Do all aggregations of one series at one pass in GroupBy
> --------------------------------------------------------
>
> Key: IOTDB-452
> URL: https://issues.apache.org/jira/browse/IOTDB-452
> Project: Apache IoTDB
> Issue Type: Improvement
> Reporter: Jialin Qiao
> Priority: Minor
>
> For example
>
> select avg(s1), count(s1), first(s1) from root.sg.d1 group by ([100,199],10ms)
>
> We could just construct one aggregate reader and get three aggregation
> results at one pass.
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