jayzhan211 commented on code in PR #11989:
URL: https://github.com/apache/datafusion/pull/11989#discussion_r1720745280
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datafusion/physical-expr-functions-aggregate/src/aggregate.rs:
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@@ -435,6 +459,10 @@ impl AggregateExpr for AggregateFunctionExpr {
.is_descending()
.and_then(|flag| self.field().ok().map(|f| (f, flag)))
}
+
+ fn default_value(&self, data_type: &DataType) -> Result<ScalarValue> {
Review Comment:
I need to add 4 places for a new function, might be room to improve 🤔
Maybe we don't need `AggregateExpr` since there is only one implement at
all. I think trait is useful if there are at least 2 implementation shares
similar function. Similar idea from #11810
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