org.apache.hadoop.hive.ql.exec

Class ComparisonOpMethodResolver

java.lang.Object

org.apache.hadoop.hive.ql.exec.ComparisonOpMethodResolver

All Implemented Interfaces:

UDFMethodResolver

public class ComparisonOpMethodResolver
extends java.lang.Object
implements UDFMethodResolver

The class implements the method resolution for operators like (> < <= >= = <>). The resolution logic is as follows: 1. If one of the parameters is null, then it resolves to evaluate(Double, Double) 2. If both of the parameters are of type T, then it resolves to evaluate(T, T) 3. If 1 and 2 fails then it resolves to evaluate(Double, Double).

Constructor Summary

Constructors

Constructor and Description
ComparisonOpMethodResolver(java.lang.Class<? extends UDF> udfClass) Constuctor.

Method Summary

Modifier and Type	Method and Description
java.lang.reflect.Method	getEvalMethod(java.util.List<TypeInfo> argTypeInfos) Gets the evaluate method for the UDF given the parameter types.

Methods inherited from class java.lang.Object

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

Constructor Detail

ComparisonOpMethodResolver

public ComparisonOpMethodResolver(java.lang.Class<? extends UDF> udfClass)

Constuctor.

Method Detail

getEvalMethod

public java.lang.reflect.Method getEvalMethod(java.util.List<TypeInfo> argTypeInfos)
                                       throws UDFArgumentException

Description copied from interface: UDFMethodResolver

Gets the evaluate method for the UDF given the parameter types.

Specified by:

getEvalMethod in interface UDFMethodResolver

Parameters:

argTypeInfos - The list of the argument types that need to matched with the evaluate function signature.

Throws:

UDFArgumentException