org.apache.drill.exec.resolver

Class TypeCastRules

java.lang.Object

org.apache.drill.exec.resolver.TypeCastRules

public class TypeCastRules
extends Object

Constructor Summary

Constructors

Constructor and Description
TypeCastRules()

Method Summary

Modifier and Type	Method and Description
static int	getCost(List<TypeProtos.MajorType> argumentTypes, DrillFuncHolder holder) Decide whether it's legal to do implicit cast.
static TypeProtos.DataMode	getLeastRestrictiveDataMode(List<TypeProtos.DataMode> dataModes)
static TypeProtos.MinorType	getLeastRestrictiveType(List<TypeProtos.MinorType> types)
static boolean	isCastable(TypeProtos.MinorType from, TypeProtos.MinorType to)
static boolean	isCastableWithNullHandling(TypeProtos.MajorType argumentType, TypeProtos.MajorType paramType, FunctionTemplate.NullHandling nullHandling)
static boolean	isNumericType(TypeProtos.MinorType inputType)

Methods inherited from class java.lang.Object

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

Constructor Detail

TypeCastRules

public TypeCastRules()

Method Detail

isCastableWithNullHandling

public static boolean isCastableWithNullHandling(TypeProtos.MajorType argumentType,
                                                 TypeProtos.MajorType paramType,
                                                 FunctionTemplate.NullHandling nullHandling)

isCastable

public static boolean isCastable(TypeProtos.MinorType from,
                                 TypeProtos.MinorType to)

getLeastRestrictiveDataMode

public static TypeProtos.DataMode getLeastRestrictiveDataMode(List<TypeProtos.DataMode> dataModes)

getLeastRestrictiveType

public static TypeProtos.MinorType getLeastRestrictiveType(List<TypeProtos.MinorType> types)

getCost

public static int getCost(List<TypeProtos.MajorType> argumentTypes,
                          DrillFuncHolder holder)

Decide whether it's legal to do implicit cast. -1 : not allowed for implicit cast > 0: cost associated with implicit cast. ==0: params are exactly same type of arg. No need of implicit.

isNumericType

public static boolean isNumericType(TypeProtos.MinorType inputType)