fix clippy errors

Author: kosiew

src/context.rs

@@ -767,7 +767,7 @@ impl PySessionContext {
         // Extract schema data if available to avoid borrowing
         let schema_owned = schema.map(|s| s.0.clone());
 
-        let _ = if path.is_instance_of::<PyList>() {
+        _ = if path.is_instance_of::<PyList>() {
             let paths = path.extract::<Vec<String>>()?;
             // Clone self to avoid borrowing
             let self_clone = self.clone();

src/substrait.rs

@@ -116,7 +116,7 @@ impl PySubstraitSerializer {
         // Create a future that moves owned values
         let future = async move { serializer::serialize_bytes(&sql_owned, &ctx_owned).await };
 
-        let proto_bytes: Vec<u8> = wait_for_future(py, future)??.into();
+        let proto_bytes: Vec<u8> = wait_for_future(py, future)??;
         Ok(PyBytes::new(py, &proto_bytes).into())
     }
 

src/utils.rs

@@ -85,6 +85,7 @@ where
                     }
                     _ = interval.tick() => {
                         // Time to check Python signals
+                        #[allow(clippy::question_mark)]
                         if let Err(py_exc) = Python::with_gil(|py| py.check_signals()) {
                             return Err(py_exc);
                         }