Add a LazyArray.to_cframe()

Author: FrancescAlted

src/blosc2/lazyexpr.py

@@ -465,6 +465,10 @@ def __array_interface__(self):
             "version": 3,
         }
 
+    # Provide a way to serialize the LazyArray
+    def to_cframe(self):
+        return self.compute().to_cframe()
+
 
 def convert_inputs(inputs):
     if not inputs or len(inputs) == 0:

tests/ndarray/test_lazyexpr.py

@@ -1423,3 +1423,18 @@ def test_scalar_dtypes(values):
     avalue2 = blosc2.asarray(value2) if hasattr(value2, "shape") else value2
     dtype2 = (avalue1 * avalue2).dtype
     assert dtype1 == dtype2, f"Expected {dtype1} but got {dtype2}"
+
+
+def test_to_cframe():
+    N = 1_000
+    dtype = "float64"
+    a = blosc2.linspace(0, 1, N * N, dtype=dtype, shape=(N, N))
+    b = blosc2.linspace(1, 2, N * N, dtype=dtype, shape=(N, N))
+    c = blosc2.linspace(0, 1, N, dtype=dtype, shape=(N,))
+    expr = a**3 + blosc2.sin(a**2)
+    cframe = expr.to_cframe()
+    assert len(cframe) > 0
+    arr = blosc2.ndarray_from_cframe(cframe)
+    assert arr.shape == expr.shape
+    assert arr.dtype == expr.dtype
+    assert np.allclose(arr[:], expr[:])