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Posted to notifications@iotdb.apache.org by "songbinghua (Jira)" <ji...@apache.org> on 2021/02/02 04:48:00 UTC

[jira] [Created] (IOTDB-1143) continuous query

songbinghua created IOTDB-1143:
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             Summary: continuous query
                 Key: IOTDB-1143
                 URL: https://issues.apache.org/jira/browse/IOTDB-1143
             Project: Apache IoTDB
          Issue Type: New Feature
          Components: Core/Engine
            Reporter: songbinghua
            Assignee: songbinghua


Continuous Query is a very useful feature for users to query time series data periodically according to the time interval and time range.

For example, using the continuous query described below, the IoTDB downsamples the CPU load metric, and keeps a single average datapoint per 15 minutes grouped by server region:

CREATE CONTINUOUS QUERY "downsampled_cpu_load"
ON database_name
BEGIN
  SELECT mean(value) as value,
  INTO "downsampled.cpu_load"
  FROM cpu_load
  GROUP BY time(15m), region
END

However, the IoTDB does not yet support this feature，but the InfluxDB has supported this feature and many scenario need this feature eagerly. So we need to support  Continuous Query，and I would like to develop it. 



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