milesgranger commented on code in PR #14106:
URL: https://github.com/apache/arrow/pull/14106#discussion_r971949459
##########
cpp/src/arrow/compute/kernels/scalar_cast_numeric.cc:
##########
@@ -769,6 +770,41 @@ std::vector<std::shared_ptr<CastFunction>>
GetNumericCasts() {
return functions;
}
+
+Status CastToExtension(KernelContext* ctx, const ExecSpan& batch, ExecResult*
out) {
+ const CastOptions& options = checked_cast<const
CastState*>(ctx->state())->options;
+
+ DCHECK(batch[0].is_array());
+ std::shared_ptr<Array> array = batch[0].array.ToArray();
+ std::shared_ptr<Array> result;
+ auto ext_ty = GetExtensionType(kOutputTargetType.type()->name());
+ if (ext_ty == nullptr) {
+ return Status::Invalid("Could not find extension type: " +
kOutputTargetType.type()->name());
+ }
+ auto out_ty = ext_ty->storage_type();
+ RETURN_NOT_OK(Cast(*array, out_ty, options,
+ ctx->exec_context())
+ .Value(&result));
+ ExtensionArray extension(ext_ty, result);
+ out->value = std::move(extension.data());
+ return Status::OK();
+}
+
+std::shared_ptr<CastFunction> GetCastToExtension(std::string name) {
+ auto func = std::make_shared<CastFunction>(std::move(name), Type::EXTENSION);
+ auto out_ty = kOutputTargetType.type();
+ std::cout << "About to add to kernel" << std::endl;
+ DCHECK_OK(func->AddKernel(Type::INT64, {InputType(Type::INT64)},
+ out_ty, CastToExtension));
Review Comment:
Okay, nice, that is almost where I found myself now, and think I have more
headway. Thank you again.
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