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Posted to notifications@iotdb.apache.org by "Chao Wang (Jira)" <ji...@apache.org> on 2023/03/28 07:03:00 UTC

[jira] [Created] (IOTDB-5735) The result of adding the distinct function to the align by device is incorrect.

Chao Wang created IOTDB-5735:
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             Summary: The result of adding the distinct function to the align by device is incorrect.
                 Key: IOTDB-5735
                 URL: https://issues.apache.org/jira/browse/IOTDB-5735
             Project: Apache IoTDB
          Issue Type: Bug
          Components: mpp-cluster
    Affects Versions: 1.0.0
            Reporter: Chao Wang


Currently, a storage group can contain a maximum of five RegionGroups. Data in different time periods of the same sequence is allocated to different RegionGroups using hash algorithm. In this case, data of the same sequence is stored in different Region Groups.
According to the execution plan of the distinct + align by device syntax, distinct data is delivered to multiple region groups for execution and then summarized and returned. During the summarization, distinct processing is not performed. As a result, duplicate data exists between multiple region groups.

!https://clouddevops.huawei.com/vision-file-storage/api/file/download/upload-v2/2023/2/27/w00549253/b70e9e8244d845f58c3891fe54c20571/image.png!

!https://clouddevops.huawei.com/vision-file-storage/api/file/download/upload-v2/2023/2/27/w00549253/90246c3a906c44fc8422b839ba27c8d2/image.png!



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