alamb commented on code in PR #6734:
URL: https://github.com/apache/arrow-datafusion/pull/6734#discussion_r1238824885
##########
datafusion/physical-expr/src/aggregate/first_last.rs:
##########
@@ -117,42 +153,57 @@ impl PartialEq<dyn Any> for FirstValue {
#[derive(Debug)]
struct FirstValueAccumulator {
first: ScalarValue,
- // At the beginning, `is_set` is `false`, this means `first` is not seen
yet.
- // Once we see (`is_set=true`) first value, we do not update `first`.
+ // At the beginning, `is_set` is false, which means `first` is not seen
yet.
Review Comment:
I don't have a strong preference -- `is_set` is fine from my perspective
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