DeleteTripsSnapshotSpec: + https://iceberg.apache.org/docs/1.5.1/spark-procedures/#snapshot A snapshot - should blow up if the underlying data is deleted !!! IGNORED !!! - should create no new files for copy-on-write !!! IGNORED !!! - should insert creates new files for copy-on-write !!! IGNORED !!! - should be cleaned up with remove_orphan_files !!! IGNORED !!!