Hi, I'm new to MonetDB, and I find that the component Mdiff would generate unexpected results if inputted wrong files, e.g., ./Mdiff wrong_file_1 wrong_file1. Mdiff will output that these two files are equal, whereas the expected result shoud be "files not exist". Attached please find the patch against version MonetDB-11.27.5. Hopefully, it can solve this problem. Best, Zhouyang