Files are not logged in txn-log for savemode ErrorIfExists

[ShahSunny]

Files are not getting logged in the txn-log for savemode, ErrorIfExists.

• This can hamper the recovery from future partial writes/failed txns.
• Partial/failed writes can also become visible in this case.

[mukulmurthy]

Hi Sunny, can you provide a bit more detail or a repro case?

Partial or failed writes should never be committed to Delta's transaction log, and so the files should never logically be part of the table.