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

java.lang.Object
  org.apache.hadoop.hive.ql.exec.NumericOpMethodResolver

All Implemented Interfaces:

UDFMethodResolver

public class NumericOpMethodResolver
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 a string, then it resolves to evaluate(double, double) 2. If one of the parameters is null, then it resolves to evaluate(T, T) where T is the other non-null parameter type. 3. If both of the parameters are null, then it resolves to evaluate(byte, byte) 4. Otherwise, it resolves to evaluate(T, T), where T is the type resulting from calling FunctionRegistry.getCommonClass() on the two arguments.

Constructor Summary

NumericOpMethodResolver(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

NumericOpMethodResolver

public NumericOpMethodResolver(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