pitrou commented on a change in pull request #11886:
URL: https://github.com/apache/arrow/pull/11886#discussion_r773943201
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File path: cpp/src/arrow/compute/kernels/scalar_validity.cc
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@@ -189,6 +194,73 @@ Status ConstBoolExec(KernelContext* ctx, const ExecBatch&
batch, Datum* out) {
return Status::OK();
}
+struct NonZeroVisitor {
+ UInt64Builder* builder;
+ const ArrayData& array;
+
+ NonZeroVisitor(UInt64Builder* builder, const ArrayData& array)
+ : builder(builder), array(array) {}
+
+ Status Visit(const DataType& type) { return
Status::NotImplemented(type.ToString()); }
+
+ template <typename Type>
+ enable_if_t<is_primitive_ctype<Type>::value, Status> Visit(const Type&) {
+ using T = typename GetViewType<Type>::T;
+ uint32_t index = 0;
+
+ return VisitArrayDataInline<Type>(
+ this->array,
+ [&](T v) {
+ if (v) {
+ this->builder->UnsafeAppend(index);
+ }
+ ++index;
+ return Status::OK();
+ },
+ [&]() {
+ ++index;
+ return Status::OK();
+ });
+ }
+};
+
+Status IndicesNonZeroExec(KernelContext* ctx, const ExecBatch& batch, Datum*
out) {
+ std::shared_ptr<ArrayData> array = batch[0].array();
+ UInt64Builder builder;
+
+ RETURN_NOT_OK(builder.Reserve(array->length));
+ NonZeroVisitor visitor(&builder, *array.get());
+ RETURN_NOT_OK(VisitTypeInline(*(array->type), &visitor));
+
+ std::shared_ptr<ArrayData> out_data;
+ RETURN_NOT_OK(builder.FinishInternal(&out_data));
+ out->value = std::move(out_data);
+ return Status::OK();
+}
+
+std::shared_ptr<ScalarFunction> MakeIndicesNonZeroFunction(std::string name,
Review comment:
As a first approach, you could put it into `vector_selection.cc`.
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