[BUG] FileNotFoundError when apply Categorify after JoinExternal

[PaulSteffen-betclic]

Bug description

When I try to use the Categorify() operator on a column after a JoinExternal(), I have the following kind of error:
FileNotFoundError: [Errno 2] No such file or directory: '~/data/categories/unique.XXXXX.parquet'

Expected behavior

Save file unique values of categorified column, like the ones done before the JoinExternal operation.

Environment details

• Merlin version: 23.8.0
• Platform: macOS
• Python version: 3.11.6
• Tensorflow version (GPU?): 2.12.1 CPU

[rnyak]

@PaulSteffen-betclic can you pls send us a toy repro example? thanks.