Hive UDAF中的NullPointException

Question

我在蜂巢中使用它时编写一个蜂巢UDAF。它抛出NullPointException
代码和整个任务日志粘贴在github gist上 - ＆gt; https://gist.github.com/hellojinjie/6750572

知道它为什么抛出NullPointException？

或者为什么说：
stderr logs java.lang.reflect.InvocationTargetException Continuing ... java.lang.IllegalArgumentException: Unbound variable: GenericUDAFCdnBytesLoaded$GenericUDAFCdnBytesLoadedEvaluator0 Continuing ...

Answer 1

UDAT需要扩展AbstractGenericUDAFResolver

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