[jira] [Resolved] (ARROW-5973) [Java] Variable width vectors' get methods should return null when the underlying data is null

["Micah Kornfield (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-5973?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Micah Kornfield resolved ARROW-5973.
------------------------------------
       Resolution: Fixed
    Fix Version/s: 1.0.0

Issue resolved by pull request 4901
[https://github.com/apache/arrow/pull/4901]

> [Java] Variable width vectors' get methods should return null when the underlying data is null
> ----------------------------------------------------------------------------------------------
>
>                 Key: ARROW-5973
>                 URL: https://issues.apache.org/jira/browse/ARROW-5973
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Java
>            Reporter: Liya Fan
>            Assignee: Liya Fan
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.0.0
>
>          Time Spent: 1h 10m
>  Remaining Estimate: 0h
>
> For variable-width vectors (VarCharVector and VarBinaryVector), when the validity bit is not set, it means the underlying data is null, so the get method should return null.
> However, the current implementation throws an IllegalStateException when NULL_CHECKING_ENABLED is set, or returns an empty array when the flag is clear.
> Maybe the purpose of this design is to be consistent with fixed-width vectors. However, the scenario is different: fixed-width vectors (e.g. IntVector) throw an IllegalStateException, simply because the primitive types are non-nullable.



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