parthchandra commented on code in PR #2069:
URL: https://github.com/apache/datafusion-comet/pull/2069#discussion_r2286356219
##########
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:
> The `hashbrown` crate removed these sort of hints after finding they did
more harm than good. In practice, unless you have PGO we should let the
compiler and branch predictor do the work. I'll probably open an issue to
discuss removing
While this is generally correct, I feel it is okay to have `unlikey` in this
case. Benchmarks do not show any difference probably because the `unlikely`
path is, well, _unlikely_. It is nevertheless a valid hint to the branch
predictor.
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