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https://issues.apache.org/jira/browse/ARROW-1489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17268163#comment-17268163
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David Li commented on ARROW-1489:
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Additionally it seems right now, even with unsafe cast enabled, a failed
string-to-float cast always raises an ArrowInvalid (it may make sense to have
an option to allow filling a null or nan or some other value instead).
> [C++] Add casting option to set unsafe casts to null rather than some garbage
> value
> -----------------------------------------------------------------------------------
>
> Key: ARROW-1489
> URL: https://issues.apache.org/jira/browse/ARROW-1489
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Wes McKinney
> Priority: Major
>
> Null is the obvious choice when certain casts fail, like string to number,
> but in other kinds of unsafe casts there may be more ambiguity.
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