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https://issues.apache.org/jira/browse/ARROW-1757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16341814#comment-16341814
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Wes McKinney commented on ARROW-1757:
-------------------------------------
I believe that dictionary indices are currently constrained to be signed
integers. So you can switch on {{indices->type_id()}} and return error in the
{{default:}} branch. See an example of this here
https://github.com/apache/arrow/blob/master/cpp/src/arrow/python/arrow_to_pandas.cc#L1057.
See also
https://github.com/apache/arrow/blob/master/cpp/src/arrow/type_traits.h to be
able to resolve other classes given a particular value type class (like
{{Int16Type}}).
> [C++] Add DictionaryArray::FromArrays alternate ctor that can check or
> sanitized "untrusted" indices
> ----------------------------------------------------------------------------------------------------
>
> Key: ARROW-1757
> URL: https://issues.apache.org/jira/browse/ARROW-1757
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Wes McKinney
> Priority: Major
> Fix For: 0.9.0
>
>
> Related to ARROW-1658. This is related to the offset sanitization in
> {{ListArray::FromArrays}}
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