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https://issues.apache.org/jira/browse/ARROW-485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15826700#comment-15826700
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Li Jin commented on ARROW-485:
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Thanks, this is super helpful. I am going to follow the steps.
> [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
> Priority: Minor
>
> 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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