chore: import upstream snapshot with attribution

python/ray/data/_internal/savemode.py

@@ -0,0 +1,28 @@
+from enum import Enum
+
+from ray.util.annotations import PublicAPI
+
+
+@PublicAPI(stability="alpha")
+class SaveMode(str, Enum):
+    """Enum of possible modes for saving/writing data."""
+
+    """Create new data and error if data already exists."""
+    CREATE = "create"
+
+    """Add new data without modifying existing data."""
+    APPEND = "append"
+
+    """Replace all existing data with new data."""
+    OVERWRITE = "overwrite"
+
+    """Don't write if data already exists."""
+    IGNORE = "ignore"
+
+    """Raise an error if data already exists."""
+    ERROR = "error"
+
+    """Update existing rows that match on key fields, or insert new rows.
+    Requires identifier/key fields to be specified.
+    """
+    UPSERT = "upsert"