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https://issues.apache.org/jira/browse/ARROW-6603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17007190#comment-17007190
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Anthony Abate commented on ARROW-6603:
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I added a PR
[https://github.com/apache/arrow/pull/6121]
note that this does not change the existing API, but can be used in-lieu of
when creating record batches.
> [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
> Original Estimate: 72h
> Remaining Estimate: 72h
>
> 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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