pitrou commented on a change in pull request #10567:
URL: https://github.com/apache/arrow/pull/10567#discussion_r663993579
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File path: cpp/src/arrow/compute/kernels/scalar_arithmetic.cc
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@@ -686,6 +686,118 @@ struct Atan2 {
}
};
+struct LogNatural {
+ template <typename T, typename Arg>
+ static enable_if_floating_point<Arg, T> Call(KernelContext*, Arg arg,
Status*) {
+ static_assert(std::is_same<T, Arg>::value, "");
+ if (arg == 0.0) {
+ return -std::numeric_limits<T>::infinity();
+ } else if (arg < 0.0) {
+ return std::numeric_limits<T>::quiet_NaN();
+ }
+ return std::log(arg);
+ }
+};
+
+struct LogNaturalChecked {
+ template <typename T, typename Arg>
+ static enable_if_floating_point<Arg, T> Call(KernelContext*, Arg arg,
Status* st) {
+ static_assert(std::is_same<T, Arg>::value, "");
+ if (arg == 0.0) {
+ *st = Status::Invalid("divide by zero");
+ return arg;
+ } else if (arg < 0.0) {
+ *st = Status::Invalid("domain error");
+ return arg;
+ }
+ return std::log(arg);
+ }
+};
+
+struct Log10 {
+ template <typename T, typename Arg>
+ static enable_if_floating_point<Arg, T> Call(KernelContext*, Arg arg,
Status*) {
+ static_assert(std::is_same<T, Arg>::value, "");
+ if (arg == 0.0) {
+ return -std::numeric_limits<T>::infinity();
+ } else if (arg < 0.0) {
+ return std::numeric_limits<T>::quiet_NaN();
+ }
+ return std::log10(arg);
+ }
+};
+
+struct Log10Checked {
+ template <typename T, typename Arg>
+ static enable_if_floating_point<Arg, T> Call(KernelContext*, Arg arg,
Status* st) {
+ static_assert(std::is_same<T, Arg>::value, "");
+ if (arg == 0) {
+ *st = Status::Invalid("divide by zero");
+ return arg;
+ } else if (arg < 0) {
+ *st = Status::Invalid("domain error");
+ return arg;
+ }
+ return std::log10(arg);
+ }
+};
+
+struct Log2 {
+ template <typename T, typename Arg>
+ static enable_if_floating_point<Arg, T> Call(KernelContext*, Arg arg,
Status*) {
+ static_assert(std::is_same<T, Arg>::value, "");
+ if (arg == 0.0) {
+ return -std::numeric_limits<T>::infinity();
+ } else if (arg < 0.0) {
+ return std::numeric_limits<T>::quiet_NaN();
+ }
+ return std::log2(arg);
+ }
+};
+
+struct Log2Checked {
+ template <typename T, typename Arg>
+ static enable_if_floating_point<Arg, T> Call(KernelContext*, Arg arg,
Status* st) {
+ static_assert(std::is_same<T, Arg>::value, "");
+ if (arg == 0.0) {
+ *st = Status::Invalid("divide by zero");
+ return arg;
+ } else if (arg < 0.0) {
+ *st = Status::Invalid("domain error");
+ return arg;
+ }
+ return std::log2(arg);
+ }
+};
Review comment:
Perhaps, or on a struct defining those two functions.
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