Fix compilation errors for features: dtype-struct and dtype-full (#99)

pyo3-polars/Cargo.toml

@@ -27,7 +27,7 @@ thiserror = "1"
 [features]
 lazy = ["polars/serde-lazy", "polars-plan", "polars-lazy/serde", "ciborium"]
 derive = ["pyo3-polars-derive", "polars-plan", "polars-ffi", "serde-pickle", "serde"]
-dtype-full = ["polars/dtype-full", "dtype-decimal", "dtype-array", "dtype-categorical"]
+dtype-full = ["polars/dtype-full", "dtype-decimal", "dtype-array", "dtype-struct", "dtype-categorical"]
 object = ["polars/object"]
 dtype-decimal = ["polars/dtype-decimal"]
 dtype-struct = ["polars/dtype-struct"]

pyo3-polars/src/types.rs

@@ -460,7 +460,7 @@ impl ToPyObject for PyDataType {
                 let categories = rev_map.as_ref().unwrap().get_categories();
                 let class = pl.getattr(intern!(py, "Enum")).unwrap();
                 let s = Series::from_arrow("category", categories.clone().boxed()).unwrap();
-                let series = to_series(py, s.into());
+                let series = to_series(py, PySeries(s));
                 return class.call1((series,)).unwrap().into();
             }
             DataType::Time => pl.getattr(intern!(py, "Time")).unwrap().into(),
@@ -577,7 +577,9 @@ impl<'py> FromPyObject<'py> for PyDataType {
                 let ordering = match ordering.extract::<&str>()? {
                     "physical" => CategoricalOrdering::Physical,
                     "lexical" => CategoricalOrdering::Lexical,
-                    ordering => PyValueError::new_err(format!("invalid ordering argument: {ordering}"))
+                    ordering => {
+                        return Err(PyValueError::new_err(format!("invalid ordering argument: {ordering}")))
+                    }
                 };
 
                 DataType::Categorical(None, ordering)