Yuan Tian created IOTDB-5522:
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Summary: Last Query performance improvement
Key: IOTDB-5522
URL: https://issues.apache.org/jira/browse/IOTDB-5522
Project: Apache IoTDB
Issue Type: Improvement
Components: Core/Query
Reporter: Yuan Tian
Assignee: liaolanyu
Attachments: image-2023-02-10-21-23-28-478.png
If we have a lot of data regions and then we execute `select last s1 from
root.sg.d1`, this sql may not execute that fast as we expected, because it may
need to wait for all data regions' result and then merge it.
In some user's case, we build a 1C9D cluster, we set dataregion per database to
27. We need 300ms to get the last query result which even slower than MatrixDB.
!image-2023-02-10-21-23-28-478.png!
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