Any idea why I've got a null object appearing here?

Could this be a directory marker? some tools would write a file that technically has an empty "base name" i.e.

PutObject <lakefs://using-r-with-lakefs/dev2/nyc/>

that has no content, to mark a directory..

poking around the code I saw this comment

Parent may be implicitly deleted if it became empty, recreate it

However, it won't be empty because there's the

.parquet

file that I've added at the same time

I agree with @Oz Katz: directory markers on S3 are a mess. They may well be behind this as well, empty directory or not. I think you might be running into this issue.

Thanks both. Tested this and confirmed that it's the

DeleteFile

that's creating the empty file. I've added a note to the issue that @Ariel Shaqed (Scolnicov) found.