[GitHub] [arrow] liyafan82 commented on pull request #9187: ARROW-11223: [Java] Fix: BaseVariableWidthVector/BaseLargeVariableWidthVector setNull() and getBufferSizeFor() trigger offset buffer overflow

[GitBox <gi...@apache.org>]

liyafan82 commented on pull request #9187:
URL: https://github.com/apache/arrow/pull/9187#issuecomment-763362710


   Thanks for reporting the problem and thanks for the discussion. 
   IMO, the behavior is by design, and the problem can be solved by calling the `setValueCount` method after calling `setNull`.
   Before calling `setValueCount`, the vector is in an undefined state, and can have some unexpected behaviors. 
   
   To use the vectors properly, we need to respect its life-cycle. Details can be found in https://arrow.apache.org/docs/java/vector.html#vector-life-cycle


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