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https://issues.apache.org/jira/browse/ARROW-8305?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ji Liu updated ARROW-8305:
--------------------------
    Description: 
In ExtensionTypeVector seems not check nullability for underlyingVector, and it 
will throw exception when it is null in some api like accept/reset/getField etc.

it's better to do null check when create ExtensionTypeVector rather than when 
really use it.

  was:
In ExtensionTypeVector seems not check nullability for underlyingVector, and it 
will throw exception when it is null in some api like accpt/reset/getField etc.

it's better to do null check when create ExtensionTypeVector rather than when 
really use it.


> [Java] ExtensionTypeVector should make sure underlyingVector not null
> ---------------------------------------------------------------------
>
>                 Key: ARROW-8305
>                 URL: https://issues.apache.org/jira/browse/ARROW-8305
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Java
>            Reporter: Ji Liu
>            Assignee: Ji Liu
>            Priority: Major
>
> In ExtensionTypeVector seems not check nullability for underlyingVector, and 
> it will throw exception when it is null in some api like 
> accept/reset/getField etc.
> it's better to do null check when create ExtensionTypeVector rather than when 
> really use it.



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