Package 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	Description
TypeCastRules()

Method Summary

Modifier and Type	Method	Description
static Optional<TypeProtos.MinorType>	getCheapestCast(TypeProtos.MinorType fromType, TypeProtos.MinorType... toTypes)	Finds the type in a given set that has the cheapest cast from a given starting type.
static float	getCost(List<TypeProtos.MajorType> argumentTypes, DrillFuncHolder holder)	Decide whether it's legal to do implicit cast.
static TypeProtos.DataMode	getLeastRestrictiveDataMode(TypeProtos.DataMode... dataModes)
static TypeProtos.MinorType	getLeastRestrictiveType(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 Details

TypeCastRules

public TypeCastRules()

Method Details

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(TypeProtos.DataMode... dataModes)

getLeastRestrictiveType

public static TypeProtos.MinorType getLeastRestrictiveType(TypeProtos.MinorType... types)

getCheapestCast

public static Optional<TypeProtos.MinorType> getCheapestCast(TypeProtos.MinorType fromType,
 TypeProtos.MinorType... toTypes)

Finds the type in a given set that has the cheapest cast from a given starting type.

Parameters:

fromType - type to cast from.

toTypes - candidate types to cast to.

Returns:

the type in toTypes that has the cheapest cast or empty if no finite cost cast can be found.

getCost

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

Decide whether it's legal to do implicit cast.

isNumericType

public static boolean isNumericType(TypeProtos.MinorType inputType)