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https://issues.apache.org/jira/browse/ARROW-5981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17026879#comment-17026879
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Antoine Pitrou commented on ARROW-5981:
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Can you elaborate a bit? Which kind of errors are we talking about here?
> [C++] DictionaryBuilder<T> initialization with Array can fail silently
> ----------------------------------------------------------------------
>
> Key: ARROW-5981
> URL: https://issues.apache.org/jira/browse/ARROW-5981
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Wes McKinney
> Priority: Major
>
> See
> https://github.com/apache/arrow/blob/master/cpp/src/arrow/array/builder_dict.cc#L267
> I think it would be better to expose {{InsertValues}} on
> {{DictionaryBuilder}} and initialize from a known dictionary that way
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