fix test

Author: Jiayu Liu

datafusion/src/physical_plan/window_functions.rs

@@ -49,7 +49,7 @@ impl FromStr for WindowFunction {
             Ok(WindowFunction::BuiltInWindowFunction(built_in_function))
         } else {
             Err(DataFusionError::Plan(format!(
-                "There is no built-in function named {}",
+                "There is no window function named {}",
                 name
             )))
         }
@@ -292,6 +292,15 @@ mod tests {
         Ok(())
     }
 
+    #[test]
+    fn test_nth_value_return_type() -> Result<()> {
+        let fun = WindowFunction::from_str("nth_value")?;
+        let observed = return_type(&fun, &[DataType::Utf8])?;
+        assert_eq!(DataType::Utf8, observed);
+
+        Ok(())
+    }
+
     #[test]
     fn test_cume_dist_return_type() -> Result<()> {
         let fun = WindowFunction::from_str("cume_dist")?;

datafusion/src/sql/planner.rs

@@ -2746,7 +2746,7 @@ mod tests {
         let sql = "SELECT order_id, MAX(delivered) OVER (order BY order_id) from orders";
         let err = logical_plan(sql).expect_err("query should have failed");
         assert_eq!(
-            "NotImplemented(\"Unsupported OVER clause (PARTITION BY order_id)\")",
+            "NotImplemented(\"Unsupported OVER clause (ORDER BY order_id)\")",
             format!("{:?}", err)
         );
     }