[jira] [Created] (IOTDB-618) Support upsert in alter timeseries syntax

[Yuan Tian (Jira)]

Yuan Tian created IOTDB-618:
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             Summary: Support upsert in alter timeseries syntax
                 Key: IOTDB-618
                 URL: https://issues.apache.org/jira/browse/IOTDB-618
             Project: Apache IoTDB
          Issue Type: New Feature
          Components: Core/Engine
            Reporter: Yuan Tian
            Assignee: Yuan Tian


We need to support a new way to update tag/attribute info.

Upsert means add new key-value if the key doesn't exist, otherwise, update the 
old one with new value.



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