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https://issues.apache.org/jira/browse/ARROW-6236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16910603#comment-16910603
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Wes McKinney commented on ARROW-6236:
-------------------------------------
Some basic profiling I did suggested the performance gains may not be that
significant but it would be worth taking a closer look to see
> [R] Deduplicate strings using Arrow hash tables instead of passing all values
> through R's global hash table
> -----------------------------------------------------------------------------------------------------------
>
> Key: ARROW-6236
> URL: https://issues.apache.org/jira/browse/ARROW-6236
> Project: Apache Arrow
> Issue Type: Improvement
> Components: R
> Reporter: Wes McKinney
> Priority: Major
> Fix For: 0.15.0
>
>
> I suspect that deserialization performance from Arrow to R vector can be
> improved by deduplicating strings locally prior to setting into R character
> vectors. You can see our corresponding deduplication logic in Python (which
> is a slightly different situation because Python does not have a GSHT, but we
> can have many references to the same object in an output NumPy array)
> https://github.com/apache/arrow/blob/master/cpp/src/arrow/python/arrow_to_pandas.cc#L409
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