preserve chunked data when creating DataArray from DataArray

xarray/core/variable.py

@@ -198,11 +198,13 @@ def as_compatible_data(data, fastpath=False):
 
     Finally, wrap it up with an adapter if necessary.
     """
+    from .dataarray import DataArray
+
     if fastpath and getattr(data, "ndim", 0) > 0:
         # can't use fastpath (yet) for scalars
         return _maybe_wrap_data(data)
 
-    if isinstance(data, Variable):
+    if isinstance(data, (Variable, DataArray)):
         return data.data
 
     if isinstance(data, NON_NUMPY_SUPPORTED_ARRAY_TYPES):

xarray/tests/test_dataarray.py

@@ -410,6 +410,18 @@ def test_constructor_from_self_described(self):
         actual = DataArray(IndexVariable("foo", ["a", "b"]))
         assert_identical(expected, actual)
 
+    @requires_dask
+    def test_constructor_from_self_described_chunked(self):
+        expected = DataArray(
+            [[-0.1, 21], [0, 2]],
+            coords={"x": ["a", "b"], "y": [-1, -2]},
+            dims=["x", "y"],
+            name="foobar",
+            attrs={"bar": 2},
+        ).chunk()
+        actual = DataArray(expected)
+        assert_identical(expected, actual)
+
     def test_constructor_from_0d(self):
         expected = Dataset({None: ([], 0)})[None]
         actual = DataArray(0)