Veeupup commented on PR #8081:
URL: 
https://github.com/apache/arrow-datafusion/pull/8081#issuecomment-1799258790

   hi @edmondop @jayzhan211 , I have a draft implementation for 
array_intersect, I use a hashmap to store the first array values and find 
values that appear in the hashmap. And it works just fine?
   
   But I encounter a problem for Float32 and Float64, we can not just use 
`HashMap<f32/f64>`  because `std::hash::Hash` is not implemented for float 
types, so I want to fix it by introducing `ordered-float` to make it hashable, 
is it too heavy for this case ?
   


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