[
https://issues.apache.org/jira/browse/IOTDB-5735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17705846#comment-17705846
]
Chao Wang commented on IOTDB-5735:
----------------------------------
!image-2023-03-28-15-05-39-555.png!
> 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
> Priority: Major
> Attachments: image-2023-03-28-15-04-19-381.png,
> image-2023-03-28-15-04-40-437.png
>
>
> 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.
> !image-2023-03-28-15-04-19-381.png!
> !image-2023-03-28-15-04-40-437.png!
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
