jorgecarleitao commented on a change in pull request #9778:
URL: https://github.com/apache/arrow/pull/9778#discussion_r602847991



##########
File path: rust/arrow-pyarrow-integration-testing/tests/test_sql.py
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@@ -78,3 +78,23 @@ def test_time32_python(self):
         del expected
         # No leak of C++ memory
         self.assertEqual(old_allocated, pyarrow.total_allocated_bytes())
+
+    def test_list_array(self):
+        """
+        Python -> Rust -> Python
+        """
+        old_allocated = pyarrow.total_allocated_bytes()
+        a = pyarrow.array([[1, 2], [1, 2]], pyarrow.list_(pyarrow.int64()))
+        b = arrow_pyarrow_integration_testing.round_trip(a)
+        # list equality does not work, so we check the elements

Review comment:
       Interesting. Equality is not part of the spec but it is very important 
that we get this right. Let's cc @pitrou here to see if this is something on 
rust or C++ side.




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