Hi,
Currently, we only support adding tag and attribute for one time series while creating it. We can't update it, drop it or add a new tag/attribute. So, I want to add the alter syntax to improve the functionality of the tag management. I plan to support the following five alter syntax: alter timeseries root.turbine.d1.s1 rename tag1 to newTag1 alter timeseries root.turbine.d1.s1 set tag1=newV1 alter timeseries root.turbine.d1.s1 drop tag1 alter timeseries root.turbine.d1.s1 add TAG tag3=v3 alter timeseries root.turbine.d1.s1 add ATTRIBUTE tag3=v3 The first one is used to change a tag/attribute key name. The second one is used to change an existing tag/attribute's value, it will throw exception if the tag/attribute doesn't exist. The third one is used to drop an existing tag/attribute if it exists. The Fourth one is used to add a new tag, if it has existed, it will throw exception. The fifth one is used to add a new attribute, if it has existed, it will throw exception.
