Hive UDAF 中的 NullPointErexception

Question

我写了一个 hive UDAF，在 hive 中使用它时。它抛出 NullPointException
代码和整个任务日志贴在github gist --> https://gist.github.com/hellojinjie/6750572

知道为什么会抛出 NullPointException 吗？

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

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