clarifies that currently no support for nested json paths

tests/extract/test_incremental.py

@@ -698,14 +698,13 @@ def some_data(created_at=dlt.sources.incremental("created_at", on_cursor_value_n
     assert s["last_value"] == 2
 
 
-# @pytest.mark.parametrize("item_type", ALL_TEST_DATA_ITEM_FORMATS)
 def test_cursor_path_none_can_raise_on_none() -> None:
-    data = [
+    # No nested json path support for pandas and arrow. See test_nested_cursor_path_arrow_fails
+    source_items = [
         {"id": 1, "created_at": 1},
         {"id": 2, "created_at": None},
         {"id": 3, "created_at": 2},
     ]
-    source_items = data_to_item_format("object", data)
 
     @dlt.resource
     def some_data(created_at=dlt.sources.incremental("created_at", on_cursor_value_none="raise")):
@@ -717,13 +716,15 @@ def some_data(created_at=dlt.sources.incremental("created_at", on_cursor_value_n
 
     # same thing when run in pipeline
     with pytest.raises(PipelineStepFailed) as pip_ex:
-        dlt.run(some_data(), destination="dummy")
+        p = dlt.pipeline(pipeline_name=uniq_id())
+        p.extract(some_data())
+
     assert isinstance(pip_ex.value.__context__, IncrementalCursorPathHasValueNone)
     assert pip_ex.value.__context__.json_path == "created_at"
 
 
 def test_cursor_path_none_nested_can_raise_on_none_1() -> None:
-    # No pandas and arrow. See test_nested_cursor_path_arrow_fails
+    # No nested json path support for pandas and arrow. See test_nested_cursor_path_arrow_fails
     @dlt.resource
     def some_data(
         created_at=dlt.sources.incremental("data.items[0].created_at", on_cursor_value_none="raise")
@@ -749,6 +750,7 @@ def some_data(
 
 
 def test_cursor_path_none_nested_can_include_on_none_1() -> None:
+    # No nested json path support for pandas and arrow. See test_nested_cursor_path_arrow_fails
     @dlt.resource
     def some_data(
         created_at=dlt.sources.incremental(
@@ -762,6 +764,7 @@ def some_data(
 
 
 def test_cursor_path_none_nested_can_include_on_none_2() -> None:
+    # No nested json path support for pandas and arrow. See test_nested_cursor_path_arrow_fails
     @dlt.resource
     def some_data(
         created_at=dlt.sources.incremental(