Package org.apache.drill.exec.resolver

Class ResolverTypePrecedence

java.lang.Object

org.apache.drill.exec.resolver.ResolverTypePrecedence

public class ResolverTypePrecedence
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
static final com.google.common.graph.ImmutableValueGraph<TypeProtos.MinorType,Float>	CAST_GRAPH

Constructor Summary

Constructors

Constructor	Description
ResolverTypePrecedence()

Method Summary

Modifier and Type	Method	Description
static float	computeCost(TypeProtos.MinorType fromType, TypeProtos.MinorType toType)	Searches the implicit casting graph for the path of least total cost using Dijkstra's algorithm.

Methods inherited from class java.lang.Object

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

Field Details

CAST_GRAPH

public static final com.google.common.graph.ImmutableValueGraph<TypeProtos.MinorType,Float> CAST_GRAPH

Constructor Details

ResolverTypePrecedence

public ResolverTypePrecedence()

Method Details

computeCost

public static float computeCost(TypeProtos.MinorType fromType,
 TypeProtos.MinorType toType)

Searches the implicit casting graph for the path of least total cost using Dijkstra's algorithm.

Parameters:

fromType - type to cast from

toType - type to cast to

Returns:

a positive float path cost or +∞ if no path exists