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https://issues.apache.org/jira/browse/ARROW-6603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17091913#comment-17091913
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Zachary Gramana commented on ARROW-6603:
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I came across this conversation late, and _after_ implementing an alternative
approach which much more in-line with other Arrow implementations.
I have submitted [GitHub Pull Request
#7032|https://github.com/apache/arrow/pull/7032] which includes:
* A newly added interface member, `AppendNull`, along with implementations for
`PrimitiveArrayBuilder` and `Binary.BuilderBase`.
* Additional work to finish the previously stubbed support for
`NullBitmapBuffer` in a few of the specialized `Array` classes.
* Several new and expanded tests.
> [C#] ArrayBuilder API to support writing nulls
> ----------------------------------------------
>
> Key: ARROW-6603
> URL: https://issues.apache.org/jira/browse/ARROW-6603
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C#
> Reporter: Eric Erhardt
> Assignee: Anthony Abate
> Priority: Major
> Labels: pull-request-available
> Original Estimate: 72h
> Time Spent: 3h 10m
> Remaining Estimate: 68h 50m
>
> There is currently no API in the PrimitiveArrayBuilder class to support
> writing nulls. See this TODO -
> [https://github.com/apache/arrow/blob/1515fe10c039fb6685df2e282e2e888b773caa86/csharp/src/Apache.Arrow/Arrays/PrimitiveArrayBuilder.cs#L101.]
>
> Also see [https://github.com/apache/arrow/issues/5381].
>
> We should add some APIs to support writing nulls.
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