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https://issues.apache.org/jira/browse/IOTDB-452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17029814#comment-17029814
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Zesong Sun commented on IOTDB-452:
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Hi [~hxd], aggregations without group by clause is implemented in [this
PR|https://github.com/apache/incubator-iotdb/pull/765].
With the development and improvement of query codes refactor, "group by clause"
part is optimized today, so this new JIRA issue is opened for group by clause.
> 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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