add count distinct group benchmarks

Author: coderfender

datafusion/functions-aggregate/benches/count_distinct.rs

@@ -228,7 +228,7 @@ fn count_distinct_groups_benchmark(c: &mut Criterion) {
                 b.iter(|| {
                     let (_schema, args) = prepare_args(DataType::Int64);
                     let mut acc = count_fn.create_groups_accumulator(args).unwrap();
-                    acc.update_batch(&[values.clone()], &group_indices, None, num_groups)
+                    acc.update_batch(std::slice::from_ref(&values), &group_indices, None, num_groups)
                         .unwrap();
                     acc.evaluate(EmitTo::All).unwrap()
                 })