Yuan Tian created IOTDB-4754:
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Summary: 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
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-2022-10-25-17-44-33-639.png!
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