[jira] [Created] (ARROW-485) [Java] Users are required to initialize VariableLengthVectors.offsetVector before calling VariableLengthVectors.mutator.getSafe

["Li Jin (JIRA)" <ji...@apache.org>]

Li Jin created ARROW-485:
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             Summary: [Java] Users are required to initialize VariableLengthVectors.offsetVector before calling VariableLengthVectors.mutator.getSafe 
                 Key: ARROW-485
                 URL: https://issues.apache.org/jira/browse/ARROW-485
             Project: Apache Arrow
          Issue Type: Improvement
            Reporter: Li Jin


https://github.com/apache/arrow/blob/master/java/vector/src/main/codegen/templates/VariableLengthVectors.java#L492

Here VariableLengthVectors.getMutator().setSafe() calls:
{code}
offsetVector.getAccessor().get(index)
{code}

 however, index 0 of offsetVector (which is always 0) is not initialized by VariableLengthVectors.

As a result, user of the VariableLengthVectors needs to manually initialize 
the class by calling:
{code}
VariableLengthVectors.getOffsetVector().getMutator().setSafe(0, 0)
{code}

I wonder if this is necessary or should VariableLengthVectors initialize this for the user




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