[jira] [Assigned] (IOTDB-3784) Tag aggregation

["Zhong Wang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IOTDB-3784?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zhong Wang reassigned IOTDB-3784:
---------------------------------

    Assignee: Zhong Wang

> Tag aggregation
> ---------------
>
>                 Key: IOTDB-3784
>                 URL: https://issues.apache.org/jira/browse/IOTDB-3784
>             Project: Apache IoTDB
>          Issue Type: New Feature
>          Components: Core/Query
>            Reporter: Zhong Wang
>            Assignee: Zhong Wang
>            Priority: Major
>
> Tags and levels of a path represent some dimensions of a timeseries. While the levels are anonymous, tags has the tag key as their name. Since the path of a timeseries is hard to change once it is created, tags are more flexible and can be added or dropped easily.
> IoTDB now supports level aggregation. But tags are used only to filter out timeseries in  `SHOW TIMESERIES` statement, and that's why tags are not widely used.
> Supporting tag aggregation allows users to store the dimensions as tags and provides the ability to do complex analysis over their timeseries data.



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