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https://issues.apache.org/jira/browse/IOTDB-4754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17624159#comment-17624159
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Yukun Zhou commented on IOTDB-4754:
-----------------------------------
https://github.com/apache/iotdb/pull/7728
> NULL String while executing schema related queries
> --------------------------------------------------
>
> Key: IOTDB-4754
> URL: https://issues.apache.org/jira/browse/IOTDB-4754
> Project: Apache IoTDB
> Issue Type: Bug
> Reporter: Yuan Tian
> Assignee: Yukun Zhou
> Priority: Major
> Attachments: image-2022-10-25-17-45-11-835.png,
> image-2022-10-25-17-45-17-194.png
>
> Original Estimate: 8h
> Remaining Estimate: 8h
>
> In `Column` of `TsBlock`, we should use `valueIsNull` field to indicate that
> current position value is null instead of directly write a "null" string
> value.
> !image-2022-10-25-17-45-11-835.png|width=284,height=326!
> !image-2022-10-25-17-45-17-194.png|width=883,height=497!
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