wesm commented on a change in pull request #7357:
URL: https://github.com/apache/arrow/pull/7357#discussion_r438827531
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File path: cpp/src/arrow/compute/kernels/scalar_string.cc
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@@ -48,6 +48,16 @@ struct AsciiUpper {
}
};
+struct AsciiLower {
+ template <typename... Ignored>
+ static std::string Call(KernelContext*, const util::string_view& val) {
+ std::string result = val.to_string();
+ std::transform(result.begin(), result.end(), result.begin(),
+ [](unsigned char c) { return std::tolower(c); });
Review comment:
Note that I used `std::toupper` _just_ for illustration purposes, not
because I thought it was the correct way to implement the kernel.
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