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

clone, equals, finalize, 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