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Posted to notifications@iotdb.apache.org by "WangChao (Jira)" <ji...@apache.org> on 2020/08/26 04:13:00 UTC

[jira] [Commented] (IOTDB-828) Support Fill in raw data query

    [ https://issues.apache.org/jira/browse/IOTDB-828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17184919#comment-17184919 ] 

WangChao commented on IOTDB-828:
--------------------------------

how does it fill? previouse ? linear? or avg?  and we need to caculate each null point when fill?

> Support Fill in raw data query
> ------------------------------
>
>                 Key: IOTDB-828
>                 URL: https://issues.apache.org/jira/browse/IOTDB-828
>             Project: Apache IoTDB
>          Issue Type: New Feature
>          Components: Core/Engine
>            Reporter: Jialin Qiao
>            Priority: Major
>
> In some cases, the collected data belongs to different manufacturing batch, the manufacturing batch is stored as a field and only inserted when it changes.
>  
> When querying multiple series with the batch, some null will occurs. The following case contains two batch data.
>  
> time, s1, batch
> 1,  1,  1
> 2, 2,  null
> 3, 3,  null
> 4, 4,  2
> 5, 5,  null
> 6, 6,  null
> In this case, we could support filling the null after aligning by time.
>  
> time, s1, batch
> 1,  1,  1
> 2, 2,  1
> 3, 3,  1
> 4, 4,  2
> 5, 5,  2
> 6, 6,  2
>  
> The related sql: select s1, batch from xxx fill()



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