[jira] [Commented] (ARROW-1489) [C++] Add casting option to set unsafe casts to null rather than some garbage value

["David Li (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-1489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17268163#comment-17268163 ] 

David Li commented on ARROW-1489:
---------------------------------

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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