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Posted to notifications@iotdb.apache.org by "Yuan Tian (Jira)" <ji...@apache.org> on 2022/11/23 02:12:00 UTC

[jira] [Created] (IOTDB-5026) Improvement of Last Query in MPP

Yuan Tian created IOTDB-5026:
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             Summary: Improvement of Last Query in MPP
                 Key: IOTDB-5026
                 URL: https://issues.apache.org/jira/browse/IOTDB-5026
             Project: Apache IoTDB
          Issue Type: Improvement
          Components: Core/Query
            Reporter: Yuan Tian
            Assignee: liaolanyu


In tsbs last-point case which contains 4000 devices and 10 sensors for each devuce, we found that too much time spent in plan phase while executing `select last * from root.cpu.*`. It's because even if we use aligned device in such case, we still treat each sensor as non-aligned, so we generate 40,000 plannodes which are too time-consuming.

Actually, we should figure out a way to make control of the plan nodes number.



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