[GitHub] [iotdb] jixuan1989 commented on issue #2769: Question; Listing Unique Sensor Values (not numeric)

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jixuan1989 commented on issue #2769:
URL: https://github.com/apache/iotdb/issues/2769#issuecomment-792621293


   Hi ope-nz, 
   At least, IoTDB does not support that currently...
   
   "Group by" in IoTDB:
   1. Group by time interval.
   2. Group by partial path of series, e.g., group by level=1,
   e.g., you have two prefix path: `root.china.a`, `root.china.b`, `root.newzealand.a`,
    `select count(*) from root group by level=1` will returns the the total count of data points that belongs to China, and the total counts of data points taht belongs to New Zealand.
   
   3. Group by data value is not supported now..
   Quickly thinking, I have no a very efficient algorithm to implement it...
   
   How do you think?
   
   BYW, send mails to  dev@iotdb.apache.org (subscribe dev-subscribe@iotdb.apache.org before your first sending email) if you can not get responses from github issues (Some guys in the community like Github issue, but for me, I rarely read these issues... and mainly focus the mailing list..)
   
   
   
   
   
   
   
   
   


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