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https://issues.apache.org/jira/browse/IOTDB-750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17128032#comment-17128032
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Jialin Qiao commented on IOTDB-750:
-----------------------------------
Oh, I know. The last but one level is device. For root.laptop.d1.s1,
"root.laptop.d1" is device, "root.laptop.d1.s1" is time series. s1 is a leaf
node.
We allow to create a device under another device, but not allow create a time
series under a leaf node.
In this test:
CREATE TIMESERIES root.sg1.d1.s1 with datatype=INT32,encoding=RLE;
CREATE TIMESERIES root.sg1.d1.d2.s1 with datatype=INT32,encoding=RLE;
CREATE TIMESERIES root.sg1.d1.d2.s2 with datatype=INT32,encoding=RLE;
Device under device is ok.
In this test:
root.laptop.d1.s1
root.laptop.d1.s1.b
b is under a leaf node s1. This is not allowed.
> Allow Sub-Devices in IoTDB Server
> ---------------------------------
>
> Key: IOTDB-750
> URL: https://issues.apache.org/jira/browse/IOTDB-750
> Project: Apache IoTDB
> Issue Type: New Feature
> Components: Core/Engine
> Reporter: Julian Feinauer
> Assignee: Julian Feinauer
> Priority: Major
> Labels: pull-request-available
> Attachments: image-2020-06-08-11-56-45-575.png,
> image-2020-06-08-11-57-00-833.png
>
>
> Currently, a Node is considered a Device if it has a measurement. Then it is
> not possible that this devices has a "subpath" which again is a device but
> only measurements.
>
> This should be changed so that a Device can also have "subdevices".
>
> Example:
> {code:java}
> CREATE TIMESERIES root.sg1.d1.s1 with datatype=INT32,encoding=RLE;
> CREATE TIMESERIES root.sg1.d1.d2.s1 with datatype=INT32,encoding=RLE;
> CREATE TIMESERIES root.sg1.d1.d2.s2 with datatype=INT32,encoding=RLE;
> {code}
> Currently the first command succeeds but the second and third fail.
> But they should also be possible.
>
> Note: Example above is from [~jixuan1989]
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