Hi,
Apache IoTDB supports Measurement Template feature from version 0.13.
The current version allows user to set different templates to different
nodes of a path and the nearest template to current node will be valid.
This will result in schema and data lost while user set a new template,
which doesn't contain schemas in the existing upper template.
Therefore, a new constraint will be introduced. If a template has been
set to a node, it will be forbidden to set any template to the ancestors or
descendants of this node, like the constraint of storage group.
Thanks,
Yukun Zhou
