Tian Jiang created IOTDB-276:
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Summary: Inconsistent ways of judging the nullness of a Field
Key: IOTDB-276
URL: https://issues.apache.org/jira/browse/IOTDB-276
Project: Apache IoTDB
Issue Type: Bug
Reporter: Tian Jiang
Attachments: image-2019-10-29-11-43-40-180.png,
image-2019-10-29-11-45-53-763.png
Several places are using the `dataType == null` to judge whether a field is
null or not, while there is a field `isNull` which better suits this job.
The inconsistent usages may result in that one sets `isNull` to true but find
that the displayed result is not null.
!image-2019-10-29-11-43-40-180.png|thumbnail!
!image-2019-10-29-11-45-53-763.png|thumbnail!
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