Subfolder with no name under /data folder

[umiddey]

Hello,

We have some processes on Glue that creates/merges into Iceberg tables. We noticed that the warehouse subfolder has created a folder with no name but a single /, screenshot attached here:

Because of this, we are facing issues (bad path due to double slash after data, like data//) while trying to read the snaphot using the python library pyiceberg (we need it as we are creating a customized tool to test the latest iceberg snapshots for data quality).

Some guidance on how to solve this or why this folder is created would be nice.

EDIT 1: The unnamed subfolder has data files in it.

EDIT 2: Some more context; I see this pattern only with tables having merge-on-read property.

[RussellSpitzer]

Are you using the HadoopFileIO or the S3FileIO? I know HadoopFileIO has some quirks with S3 where it creates psudeo-directories some times to mimic posix.

[umiddey]

Are you using the HadoopFileIO or the S3FileIO? I know HadoopFileIO has some quirks with S3 where it creates psudeo-directories some times to mimic posix.

I am using the S3FileIO, not HadoopFileIO. Seems it is not exclusive to the file system. :(