icexelloss commented on code in PR #34912:
URL: https://github.com/apache/arrow/pull/34912#discussion_r1167171059
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cpp/src/arrow/compute/kernels/aggregate_basic_internal.h:
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@@ -272,8 +273,120 @@ struct MeanKernelInit : public SumLikeInit<KernelClass> {
};
// ----------------------------------------------------------------------
-// MinMax implementation
+// Last implementation
+template <typename ArrowType, SimdLevel::type SimdLevel, typename Enable =
void>
+struct FirstLastState {};
+
+template <typename ArrowType, SimdLevel::type SimdLevel>
+struct FirstLastState<ArrowType, SimdLevel,
enable_if_floating_point<ArrowType>> {
+ using ThisType = FirstLastState<ArrowType, SimdLevel>;
+ using T = typename ArrowType::c_type;
+ using ScalarType = typename TypeTraits<ArrowType>::ScalarType;
+
+ ThisType& operator+=(const ThisType& rhs) {
+ this->has_nulls |= rhs.has_nulls;
+ this->first = this->first.has_value() ? this->first : rhs.first;
+ this->last = rhs.last.has_value() ? rhs.last : this->last;
+ return *this;
+ }
+
+ void MergeOne(T value) {
+ if (!this->first.has_value()) {
+ this->first = value;
+ }
+ this->last = value;
+ }
+
+ std::optional<T> first = std::nullopt;
Review Comment:
Done
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