Hi @mits1,

This looks like the same issue I covered recently. Please see here. 

The issue is that Autoloader is ingesting your checkpoint files as data. Because Checkpoint/ lives inside the data directory, Autoloader picks up those checkpoint JSONs. They don’t match your explicit schema, so all your business columns (and _metadata after cast) become NULL, and their content goes into _rescued_data.

To fix this, consider moving the checkpoint location outside the source path..

If this answer resolves your question, could you mark it as “Accept as Solution”? That helps other users quickly find the correct fix.