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https://issues.apache.org/jira/browse/IOTDB-358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17046089#comment-17046089
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Jialin Qiao commented on IOTDB-358:
-----------------------------------
The start time point is the same as the start time of the quired interval. I
think the new syntax is more friendly to users.
> Questions about the `group by` down-samplying clause
> ----------------------------------------------------
>
> Key: IOTDB-358
> URL: https://issues.apache.org/jira/browse/IOTDB-358
> Project: Apache IoTDB
> Issue Type: Bug
> Affects Versions: 0.9.0
> Reporter: xiangdong Huang
> Priority: Major
> Labels: discussion
>
> When reading issue #331, I read the `group by` document again and find some
> confusing contents:
> V0.9:
> [http://iotdb.apache.org/#/Documents/0.9.0/chap5/sec2]
> # (minor), typo, Fig 5.2 rather than Fig 3.2
> # The first parameter of the GROUP BY statement above is the time interval
> for dividing the time axis. Taking this parameter (1d) as time interval and
> the default origin as the dividing origin, the time axis is divided into
> several continuous intervals, which are [0,1d], [1d, 2d], [2d, 3d], etc.
> My question is, is the data point at 1d calculated twice?
>
> V0.10:
> [http://iotdb.apache.org/#/Documents/progress/chap5/sec2]
> the syntax is quite different with v0.9.0. I originally thought it was an
> improvement comparing with 0.9, but when I read the document, I find it loses
> the ability to define the start point of the timestamp for splitting the time
> window.
> Can someone tell me why to design like this?
>
>
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