Function RemoveTrailingSlash

cpp/src/arrow/dataset/subtree_test.cc:102–107

using PT = TestPathTree;

std::string_view RemoveTrailingSlash(std::string_view key) {
  while (!key.empty() && key.back() == '/') {
    key.remove_suffix(1);
  }
  return key;
}
bool IsAncestorOf(std::string_view ancestor, std::string_view descendant) {
  // See filesystem/path_util.h
  ancestor = RemoveTrailingSlash(ancestor);