Increase testing of generic types storage (#282)

- add list of structs
 - rename for clarity

Co-authored-by: Eric Vergnaud <eric.vergnaud@databricks.com>

tests/integration/test_structs.py

@@ -5,18 +5,25 @@
 
 
 @dataclass
-class Foo:
+class Nested:
     first: str
     second: bool | None
 
 
 @dataclass
-class Nested:
-    foo: Foo
+class NestedWithDict:
+    name: str
+    other: dict[str, str] | None
+
+
+@dataclass
+class Nesting:
+    nested: Nested
     since: datetime.date
     created: datetime.datetime
     mapping: dict[str, int]
-    array: list[int]
+    int_array: list[int]
+    struct_array: list[NestedWithDict]
 
 
 def test_appends_complex_types(ws, env_or_skip, make_random) -> None:
@@ -27,10 +34,10 @@ def test_appends_complex_types(ws, env_or_skip, make_random) -> None:
     sql_backend.save_table(
         full_name,
         [
-            Nested(Foo("a", True), today, now, {"a": 1, "b": 2}, [1, 2, 3]),
-            Nested(Foo("b", False), today, now, {"c": 3, "d": 4}, [4, 5, 6]),
+            Nesting(Nested("a", True), today, now, {"a": 1, "b": 2}, [1, 2, 3], [NestedWithDict("s", {"f1": "v1", "f2": "v2"})]),
+            Nesting(Nested("b", False), today, now, {"c": 3, "d": 4}, [4, 5, 6], []),
         ],
-        Nested,
+        Nesting,
     )
     rows = list(sql_backend.fetch(f"SELECT * FROM {full_name}"))
     assert len(rows) == 2