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The "Hive/GenericUDAFCaseStudy" page has been changed by JohnSichi. http://wiki.apache.org/hadoop/Hive/GenericUDAFCaseStudy?action=diff&rev1=6&rev2=7 -------------------------------------------------- || init || Called by Hive to initialize an instance of your UDAF evaluator class. || || getNewAggregationBuffer || Return an object that will be used to store temporary aggregation results. || || iterate || Process a new row of data into the aggregation buffer || - || terminatePartial || Return the contents of the current aggregation in a serializable way || + || terminatePartial || Return the contents of the current aggregation in a persistable way. Here persistable means the return value can only be built up in terms of Java primitives, arrays, primitive wrappers (e.g. Double), Hadoop Writables, Lists, and Maps. Do NOT use your own classes (even if they implement java.io.Serializable), otherwise you may get strange errors or (probably worse) wrong results. || || merge || Merge a partial aggregation returned by '''terminatePartial''' into the current aggregation || || terminate || Return the final result of the aggregation to Hive ||
