org.apache.hadoop.hive.ql.optimizer.physical

Class SkewJoinResolver

java.lang.Object

org.apache.hadoop.hive.ql.optimizer.physical.SkewJoinResolver

All Implemented Interfaces:

PhysicalPlanResolver

public class SkewJoinResolver
extends Object
implements PhysicalPlanResolver

An implementation of PhysicalPlanResolver. It iterator each task with a rule dispatcher for its reducer operator tree, for task with join op in reducer, it will try to add a conditional task associated a list of skew join tasks.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	SkewJoinResolver.SkewJoinProcCtx A container of current task and parse context.

Constructor Summary

Constructors

Constructor and Description
SkewJoinResolver()

Method Summary

Methods

Modifier and Type	Method and Description
PhysicalContext	resolve(PhysicalContext pctx) All physical plan resolvers have to implement this entry method.

Methods inherited from class java.lang.Object

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

Constructor Detail

SkewJoinResolver

public SkewJoinResolver()

Method Detail

resolve

public PhysicalContext resolve(PhysicalContext pctx)
                        throws SemanticException

Description copied from interface: PhysicalPlanResolver

All physical plan resolvers have to implement this entry method.

Specified by:

resolve in interface PhysicalPlanResolver

Returns:

the physical plan

Throws:

SemanticException