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https://issues.apache.org/jira/browse/ARROW-14068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17418551#comment-17418551
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David Li commented on ARROW-14068:
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Oh, interesting. We could dictionary-decode in C++ but ideally we should
operate on the dictionary itself if possible.
> [R] Better handling of calling string functions on dictionaries
> ---------------------------------------------------------------
>
> Key: ARROW-14068
> URL: https://issues.apache.org/jira/browse/ARROW-14068
> Project: Apache Arrow
> Issue Type: Improvement
> Components: R
> Reporter: Nicola Crane
> Priority: Major
>
> When working with R tables that have factor columns and then have been
> converted into Arrow Tables, it's not pretty when we try to call string
> functions on those columns (which are now dictionaries)
> {code:java}
> Table$create(iris) %>%
> mutate(x = str_to_lower(Species))
> ## Error: NotImplemented: Function utf8_lower has no kernel matching input
> types (array[dictionary<values=string, indices=int8, ordered=0>])
> {code}
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