jorgecarleitao commented on a change in pull request #7687:
URL: https://github.com/apache/arrow/pull/7687#discussion_r463919728



##########
File path: rust/datafusion/src/execution/physical_plan/hash_aggregate.rs
##########
@@ -327,120 +278,47 @@ impl RecordBatchReader for GroupedHashAggregateIterator {
                 })
                 .collect::<ArrowResult<Vec<_>>>()?;
 
-            // create vector large enough to hold the grouping key
+            // create vector to hold the grouping key
             let mut key = Vec::with_capacity(group_values.len());
             for _ in 0..group_values.len() {
-                key.push(GroupByScalar::UInt32(0));
+                key.push(KeyScalar::UInt32(0));
             }
 
             // iterate over each row in the batch and create the accumulators 
for each grouping key
-            let mut accumulators: Vec<Rc<AccumulatorSet>> =

Review comment:
       Actually, this information is incorrect. My CPU family is [Kaby 
Lake](https://en.wikipedia.org/wiki/Kaby_Lake), which as the AVX2.0 extension.




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