test: update duckdb example

Author: sunng87

arrow-pg/examples/duckdb.rs

@@ -26,6 +26,7 @@ pub struct DuckDBBackend {
     query_parser: Arc<NoopQueryParser>,
 }
 
+#[derive(Debug)]
 struct DummyAuthSource;
 
 #[async_trait]
@@ -44,7 +45,7 @@ impl AuthSource for DummyAuthSource {
 
 #[async_trait]
 impl SimpleQueryHandler for DuckDBBackend {
-    async fn do_query<'a, C>(&self, _client: &mut C, query: &str) -> PgWireResult<Vec<Response<'a>>>
+    async fn do_query<C>(&self, _client: &mut C, query: &str) -> PgWireResult<Vec<Response>>
     where
         C: ClientInfo + Unpin + Send + Sync,
     {
@@ -152,12 +153,12 @@ impl ExtendedQueryHandler for DuckDBBackend {
         self.query_parser.clone()
     }
 
-    async fn do_query<'a, C>(
+    async fn do_query<C>(
         &self,
         _client: &mut C,
         portal: &Portal<Self::Statement>,
         _max_rows: usize,
-    ) -> PgWireResult<Response<'a>>
+    ) -> PgWireResult<Response>
     where
         C: ClientInfo + Unpin + Send + Sync,
     {