[GitHub] [arrow] ShaoxiongTang opened a new issue #9360: Appending vector to vector which had been not assigned with VectorAppender.append throw exception

Fri, 29 Jan 2021 03:17:56 -0800 


ShaoxiongTang opened a new issue #9360:
URL: https://github.com/apache/arrow/issues/9360


   In our project , when we attempt to append some vector to output buffer 
which is created by 'VectorSchemaRoot.create' method and had been not set 
values, we got follow error message 
   
   
![image](https://user-images.githubusercontent.com/7252486/106268144-a38bd000-6265-11eb-9cce-829aa0e19631.png)
   
   Related code: 
   
![image](https://user-images.githubusercontent.com/7252486/106268220-c0280800-6265-11eb-9b8b-c7db9c3b4ac2.png)
   
   Could we change code like this ?
   ``` 
   int targetDataSize = targetVector.getValueCount() == 0 ?
               0 : 
targetVector.getOffsetBuffer().getInt((long)targetVector.getValueCount() * 
BaseVariableWidthVector.OFFSET_WIDTH);
   ```


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