alamb commented on code in PR #12017:
URL: https://github.com/apache/datafusion/pull/12017#discussion_r1719087314
##########
datafusion/functions-aggregate-common/src/aggregate/groups_accumulator/bool_op.rs:
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@@ -77,7 +82,9 @@ where
if self.values.len() < total_num_groups {
let new_groups = total_num_groups - self.values.len();
- self.values.append_n(new_groups, Default::default());
+ // Fill with the identity element, so that when the first non-null
value is encountered,
+ // it will combine with the identity and the result will be the
first non-null value itself.
+ self.values.append_n(new_groups, self.identity);
Review Comment:
Nice -- this is similar to the default value for the PrimitiveOp accumulator
too
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