wesm commented on pull request #7442:
URL: https://github.com/apache/arrow/pull/7442#issuecomment-644913406


   The string perf regressions are mostly for the cases where 99.9% of the 
values are selected. I'll take a closer look at this to see what can be done. 
The varbinary case is so important that we might want to create a specialized 
implementation for it


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