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https://issues.apache.org/jira/browse/ARROW-8532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17090615#comment-17090615
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Wes McKinney commented on ARROW-8532:
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If you want to propose a configuration option to place some non-zero value in
the null slots, please feel free to do so.
> [C++][CSV] Add support for sentinel values.
> -------------------------------------------
>
> Key: ARROW-8532
> URL: https://issues.apache.org/jira/browse/ARROW-8532
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Ravil Bikbulatov
> Priority: Major
>
> Some systems still use sentinel values to store nulls. It would be good if
> read_csv would place sentinel values and user wouldn't need to convet null
> bitmaps to sentinel values.
> Adding this support doesn't contradict Arrow specification as null values are
> undefined. Also it wouldn't add any overhead to read_csv. Since Arrow is
> general purpose framework I think we can relieve users from pain of
> converting bitmats to sentinel values.
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