org.apache.hadoop.hive.ql.exec
Class NumericUDAFEvaluatorResolver

java.lang.Object
  org.apache.hadoop.hive.ql.exec.DefaultUDAFEvaluatorResolver
      org.apache.hadoop.hive.ql.exec.NumericUDAFEvaluatorResolver

All Implemented Interfaces:

UDAFEvaluatorResolver

public class NumericUDAFEvaluatorResolver
extends DefaultUDAFEvaluatorResolver

Resolver for Numeric UDAFs like sum and avg. If the input argument is string or date, the resolver returns the evaluator whose iterate function operates on doubles.

Constructor Summary

NumericUDAFEvaluatorResolver(Class<? extends UDAF> udafClass)
Constructor.

Method Summary

Class<? extends UDAFEvaluator>

getEvaluatorClass(List<TypeInfo> argTypeInfos) Gets the evaluator class for the UDAF given the parameter types.

Methods inherited from class java.lang.Object

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

Constructor Detail

NumericUDAFEvaluatorResolver

public NumericUDAFEvaluatorResolver(Class<? extends UDAF> udafClass)

Constructor.

Method Detail

getEvaluatorClass

public Class<? extends UDAFEvaluator> getEvaluatorClass(List<TypeInfo> argTypeInfos)
                                                 throws UDFArgumentException

Description copied from class: DefaultUDAFEvaluatorResolver

Gets the evaluator class for the UDAF given the parameter types.

Specified by:

getEvaluatorClass in interface UDAFEvaluatorResolver

Overrides:

getEvaluatorClass in class DefaultUDAFEvaluatorResolver

Parameters:

argTypeInfos - The list of the parameter types.

Throws:

UDFArgumentException