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rdd不能巢狀rdd

Py4JError: An error occurred while calling o131.__getnewargs__. Trace: py4j.Py4JException: Method __getnewargs__([]) does not exist at py4j.reflection.ReflectionEngine.getMethod(ReflectionEngine.java:335) at py4j.reflection.ReflectionEngine.getMethod(ReflectionEngine.java:344) at py4j.Gateway.invoke(Gateway.java:252) at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:133) at py4j.commands.CallCommand.execute(CallCommand.java:79) at py4j.GatewayConnection.run(GatewayConnection.java:209) at java.lang.Thread.run(Thread.java:745)