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 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

ComparisonOpMethodResolver(Class<? extends UDF> udfClass)
Constuctor.

Method Summary

Method

getEvalMethod(List<TypeInfo> argTypeInfos) Gets the evaluate method for the UDF given the parameter types.

Methods inherited from class java.lang.Object

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

Constructor Detail

ComparisonOpMethodResolver

public ComparisonOpMethodResolver(Class<? extends UDF> udfClass)

Constuctor.

Method Detail

getEvalMethod

public Method getEvalMethod(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