HaochengLIU commented on code in PR #41822:
URL: https://github.com/apache/arrow/pull/41822#discussion_r1625104098


##########
cpp/src/arrow/filesystem/s3fs.cc:
##########
@@ -2859,17 +2859,41 @@ Status S3FileSystem::CreateDir(const std::string& s, 
bool recursive) {
     return impl_->CreateBucket(path.bucket);
   }
 
+  FileInfo file_info;
   // Create object
   if (recursive) {
     // Ensure bucket exists
     ARROW_ASSIGN_OR_RAISE(bool bucket_exists, 
impl_->BucketExists(path.bucket));
     if (!bucket_exists) {
       RETURN_NOT_OK(impl_->CreateBucket(path.bucket));
     }
+
+    auto key_i = path.key_parts.begin();
+    std::string parent_key{};
+    if (options().check_directory_existence_before_creation) {

Review Comment:
   This if condition walks upwards.



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