[KYUUBI #5877][FOLLOWUP] Catch all exception when dump the result to json and fix typo

externals/kyuubi-spark-sql-engine/src/main/resources/python/execute_python.py

@@ -497,7 +497,21 @@ def main():
                         "content": {
                             "status": "error",
                             "ename": "ValueError",
-                            "evalue": "cannot json-ify %s" % response,
+                            "evalue": "cannot json-ify %s" % result,
+                            "traceback": [],
+                        },
+                    }
+                )
+            except Exception:
+                exc_type, exc_value, tb = sys.exc_info()
+                result = json.dumps(
+                    {
+                        "msg_type": "inspect_reply",
+                        "content": {
+                            "status": "error",
+                            "ename": str(exc_type.__name__),
+                            "evalue": "cannot json-ify %s: %s"
+                            % (result, str(exc_value)),
                             "traceback": [],
                         },
                     }

kyuubi-server/src/test/scala/org/apache/kyuubi/engine/spark/PySparkTests.scala

@@ -187,6 +187,26 @@ class PySparkTests extends WithKyuubiServer with HiveJDBCTestHelper {
     }
   }
 
+  test("catch all exception when dump the result to json") {
+    checkPythonRuntimeAndVersion()
+    withSessionConf()(Map(KyuubiConf.ENGINE_SPARK_PYTHON_MAGIC_ENABLED.key -> "true"))() {
+      withMultipleConnectionJdbcStatement()({ stmt =>
+        val statement = stmt.asInstanceOf[KyuubiStatement]
+        statement.executePython("l = [('Alice', 1)]")
+        statement.executePython("df = spark.createDataFrame(l)")
+        val errorMsg = intercept[KyuubiSQLException] {
+          statement.executePython("%json df")
+        }.getMessage
+        assert(errorMsg.contains("Object of type DataFrame is not JSON serializable"))
+
+        statement.executePython("df = spark.createDataFrame(l).collect()")
+        val result = statement.executePython("%json df")
+        assert(result.next())
+        assert(result.getString("output") == "{\"application/json\":[[\"Alice\",1]]}")
+      })
+    }
+  }
+
   private def runPySparkTest(
       pyCode: String,
       output: String): Unit = {