org.apache.hadoop.hive.contrib.udaf.example

Class UDAFExampleAvg

java.lang.Object

org.apache.hadoop.hive.ql.exec.UDAF

org.apache.hadoop.hive.contrib.udaf.example.UDAFExampleAvg

public final class UDAFExampleAvg
extends UDAF

This is a simple UDAF that calculates average. It should be very easy to follow and can be used as an example for writing new UDAFs. Note that Hive internally uses a different mechanism (called GenericUDAF) to implement built-in aggregation functions, which are harder to program but more efficient.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	UDAFExampleAvg.UDAFAvgState The internal state of an aggregation for average.
static class	UDAFExampleAvg.UDAFExampleAvgEvaluator The actual class for doing the aggregation.

Method Summary

Methods inherited from class org.apache.hadoop.hive.ql.exec.UDAF

getResolver, setResolver

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait