pitrou commented on pull request #9606:
URL: https://github.com/apache/arrow/pull/9606#issuecomment-790546124


   Also note that the current implementation (in `scalar_set_lookup.cc`) is 
suboptimal as it decodes the dictionary array and runs the set lookup for each 
decoded dictionary value. It would be more efficient to compute and cache 
lookup results for distinct dictionary elements. That can be for a later JIRA, 
though.


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