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

["Liya Fan (JIRA)" <ji...@apache.org>]

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

Liya Fan updated ARROW-5973:
----------------------------
    Summary: [Java] Variable width vectors' get methods should return null when the underlying data is null  (was: [Java] Variable width vectors' get methods should return return null when the underlying data is null)

> [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
>
> 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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