berkaysynnada commented on code in PR #11989:
URL: https://github.com/apache/datafusion/pull/11989#discussion_r1722865644
##########
datafusion/functions-aggregate-common/src/aggregate.rs:
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@@ -171,6 +170,11 @@ pub trait AggregateExpr: Send + Sync + Debug +
PartialEq<dyn Any> {
fn get_minmax_desc(&self) -> Option<(Field, bool)> {
None
}
+
+ /// Returns default value of the function given the input is Null
+ /// Most of the aggregate function return Null if input is Null,
+ /// while `count` returns 0 if input is Null
+ fn default_value(&self, data_type: &DataType) -> Result<ScalarValue>;
Review Comment:
👍🏻
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