Feature Description

Support the write_if_not_exists capability for the fs backend. This should be easy by opening the file with the O_EXCL POSIX flag

Problem and Solution

Some DAL clients rely on write-if-not-exists as a concurrency mechanism in the presence of multiple writers. One example is Iceberg clients using File System Tables: https://iceberg.apache.org/spec/#file-system-tables .

This feature would allow such clients to work with the fs backend.

Additional Context

No response

Are you willing to contribute to the development of this feature?

• Yes, I am willing to contribute to the development of this feature.