Hive UDAF中的NullPointException

Question

在蜂巢中使用它時，我編寫了一個蜂巢UDAF。 拋出NullPointException
代碼和整個任務日志均粘貼在github gist-> https://gist.github.com/hellojinjie/6750572

知道為什么會拋出NullPointException嗎？

或為什么這樣說：
stderr logs java.lang.reflect.InvocationTargetException Continuing ... java.lang.IllegalArgumentException: Unbound variable: GenericUDAFCdnBytesLoaded$GenericUDAFCdnBytesLoadedEvaluator0 Continuing ...

Answer 1

UDAT需要擴展AbstractGenericUDAFResolver

參見https://github.com/hellojinjie/hive-function/blob/d321281f67c357f50e8d3f98252c65682049da06/src/main/java/shaman/hive/udf/GenericUDAFCdnBytesLoaded.java