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https://issues.apache.org/jira/browse/ARROW-13319?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17379435#comment-17379435
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David Li commented on ARROW-13319:
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Possibly related to/the same as ARROW-12804?
> [C++] NullArray::IsNull always returns false and NullArray::IsValid always
> returns true
> ---------------------------------------------------------------------------------------
>
> Key: ARROW-13319
> URL: https://issues.apache.org/jira/browse/ARROW-13319
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Affects Versions: 3.0.0, 5.0.0
> Reporter: Nate Clark
> Priority: Major
>
> NullArray::SetData sets null_bitmap_data_ to NULLPTR which IsNull and IsValid
> interpret as all values are not null. However, null_count() and length() will
> return the same value which makes it seem like IsNull() and IsValid() should
> return true and false respectively.
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