only wrap BackendArrays in CopyOnWriteArray

pydata · Feb 6, 2024 · ca17266 · ca17266
1 parent c9ba2be
commit ca17266
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/xarray/backends/api.py b/xarray/backends/api.py
@@ -236,7 +236,10 @@ def _protect_dataset_variables_inplace(dataset, cache):
     for name, variable in dataset.variables.items():
         if name not in dataset._indexes:
             # no need to protect IndexVariable objects
-            data = indexing.CopyOnWriteArray(variable._data)
+            if isinstance(variable._data, backends.BackendArray):
+                data = indexing.CopyOnWriteArray(variable._data)
+            else:
+                data = variable.data
             if cache:
                 data = indexing.MemoryCachedArray(data)
             variable.data = data