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https://issues.apache.org/jira/browse/ARROW-4091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16918781#comment-16918781
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Wes McKinney commented on ARROW-4091:
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I think convenient defaults for the C++ library are probably:
"null"
"NULL"
"NA" (possibly)
Not sure if any others
> [C++] Curate default list of CSV null spellings
> -----------------------------------------------
>
> Key: ARROW-4091
> URL: https://issues.apache.org/jira/browse/ARROW-4091
> Project: Apache Arrow
> Issue Type: Wish
> Components: C++
> Affects Versions: 0.11.1
> Reporter: Antoine Pitrou
> Priority: Major
> Labels: csv
> Fix For: 1.0.0
>
>
> "NaN" is not null in Arrow-land (at least not for float columns?).
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