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

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

     [ https://issues.apache.org/jira/browse/ARROW-485?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Li Jin resolved ARROW-485.
--------------------------
    Resolution: Fixed

> [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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