implement_group_accumulators_count_distinct

Author: coderfender

datafusion/functions-aggregate-common/src/aggregate/count_distinct/groups.rs

@@ -6,6 +6,7 @@ use datafusion_common::HashSet;
 use datafusion_common::hash_utils::RandomState;
 use datafusion_expr_common::groups_accumulator::{EmitTo, GroupsAccumulator};
 use std::hash::Hash;
+use std::mem::size_of;
 use std::sync::Arc;
 
 pub struct PrimitiveDistinctCountGroupsAccumulator<T: ArrowPrimitiveType>