comphead commented on code in PR #2069:
URL: https://github.com/apache/datafusion-comet/pull/2069#discussion_r2254688999


##########
native/spark-expr/src/agg_funcs/sum_decimal.rs:
##########
@@ -287,24 +287,16 @@ impl SumDecimalGroupsAccumulator {
         !self.is_empty.get_bit(index) && !self.is_not_null.get_bit(index)
     }
 
+    #[inline]
     fn update_single(&mut self, group_index: usize, value: i128) {
-        if unlikely(self.is_overflow(group_index)) {
-            // This means there's a overflow in decimal, so we will just skip 
the rest
-            // of the computation
-            return;
-        }
-
         self.is_empty.set_bit(group_index, false);
         let (new_sum, is_overflow) = 
self.sum[group_index].overflowing_add(value);
+        self.sum[group_index] = new_sum;
 
-        if is_overflow || !is_valid_decimal_precision(new_sum, self.precision) 
{
+        if unlikely(is_overflow || !is_valid_decimal_precision(new_sum, 
self.precision)) {

Review Comment:
   Thanks @leung-ming afaik `unlikely` is still in night builds 
https://doc.rust-lang.org/std/hint/fn.unlikely.html
   ?
   



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