bugfix

Author: dcherian

xarray/backends/api.py

@@ -245,6 +245,9 @@ def _chunk_ds(
 
     variables = {}
     for name, var in backend_ds.variables.items():
+        if var._in_memory:
+            variables[name] = var
+            continue
         var_chunks = _get_chunk(
             var._data,
             chunks,

xarray/namedarray/utils.py

@@ -215,7 +215,7 @@ def _get_chunk(  # type: ignore[no-untyped-def]
     from xarray.core.utils import emit_user_level_warning
     from xarray.structure.chunks import _get_breaks_cached
 
-    dims = dims or chunks.keys()
+    dims = chunks.keys() if dims is None else dims
     shape = data.shape
 
     # Determine the explicit requested chunks.