alamb opened a new issue, #161:
URL: https://github.com/apache/arrow-rs/issues/161

   *Note*: migrated from original JIRA: 
https://issues.apache.org/jira/browse/ARROW-11051
   
   Minimal example
   
    
   {quote}use arrow::\{array::PrimitiveArray, datatypes::Int64Type};
   
   fn main() \{
        let mut s = vec![];
        for _ in 0..32  
         
        \{
            s.push(Some(1i64));         s.push(None);     
        }
        let v: PrimitiveArray<Int64Type> = s.into();
        dbg!(arrow::compute::sum(&v));
    }
     
   {quote}
    dependency
   {quote}arrow = \{version = "2", features = ["simd"]}
   {quote}
   The following code in `compute::sum` is wrong. The bit mask is checked 
reversed.
   {quote}            remainder.iter().enumerate().for_each(|(i, value)| \{
                    if remainder_bits & (1 << i) != 0  \{
   
                       remainder_sum = remainder_sum + *value;
   
                    }
   
               });
     
   {quote}


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