cyb70289 commented on a change in pull request #7418:
URL: https://github.com/apache/arrow/pull/7418#discussion_r439448175
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File path: cpp/src/arrow/compute/kernels/scalar_string.cc
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@@ -37,26 +39,108 @@ struct AsciiLength {
}
};
-struct AsciiUpper {
- // XXX: the Scalar codegen path passes template arguments that are unused
- 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::toupper(c); });
- return result;
+using TransformFunc = std::function<void(const uint8_t*, int64_t, uint8_t*)>;
+
+void StringDataTransform(KernelContext* ctx, const ExecBatch& batch,
+ TransformFunc transform, Datum* out) {
+ if (batch[0].kind() == Datum::ARRAY) {
+ const ArrayData& input = *batch[0].array();
+ ArrayData* out_arr = out->mutable_array();
+ // Reuse offsets from input
+ out_arr->buffers[1] = input.buffers[1];
Review comment:
These buffers[1], buffers[2] are mysterious to me. Any hint to figure it
out? Thanks.
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