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