pitrou commented on a change in pull request #11298:
URL: https://github.com/apache/arrow/pull/11298#discussion_r721338932
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File path: cpp/src/arrow/compute/kernels/scalar_string.cc
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@@ -592,6 +592,70 @@ struct Utf8ReverseTransform : public StringTransformBase {
template <typename Type>
using Utf8Reverse = StringTransformExec<Type, Utf8ReverseTransform>;
+struct Utf8NfTransformBase : public StringTransformBase {
+ int64_t MaxCodeunits(int64_t ninputs, int64_t input_ncodeunits) override {
+ // Section 5.18 of the Unicode spec claims that the number of codepoints
for case
Review comment:
Hmm... is the growth factor actually the same for normalization as for
case transforms? That seems a bit surprising.
Also, the growth factor could actually depend on the actual normalization:
combined forms should arguably be more compact that decomposed form?
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