jhorstmann commented on pull request #806:
URL: https://github.com/apache/arrow-datafusion/pull/806#issuecomment-890977100


   Cool, this is interesting to me since in our query engine we started from 
the opposite approach of initially rewriting all IN expressions into comparison 
and OR and are now introducing specialized kernel for IN. Would be very 
interested in finding out where the threshold for this optimization is. The 
benefit is probably bigger for dictionary encoded data and numbers since the 
string comparison itself will involve some branches.


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