[GitHub] [incubator-iotdb] samperson1997 opened a new pull request #517: [IOTDB-276] Fix inconsistent ways of judging whether a Field is null

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samperson1997 opened a new pull request #517: [IOTDB-276] Fix inconsistent ways of judging whether a Field is null
URL: https://github.com/apache/incubator-iotdb/pull/517
 
 
   Fix inconsistent ways of judging whether a Field is null by removing `isNull` field and `setNull` method. Only retain one way of defining a null field `new Field(null)`, and `isNull()` method can be realized by checking `this.dataType == null`.

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