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

java.lang.Object
  org.apache.hadoop.hive.ql.optimizer.physical.SamplingOptimizer

All Implemented Interfaces:

PhysicalPlanResolver

public class SamplingOptimizer
extends Object
implements PhysicalPlanResolver

Mark final MapredWork for ORDER BY to use sampling and set number of reduce task as -1

Constructor Summary

SamplingOptimizer()

Method Summary

PhysicalContext

resolve(PhysicalContext pctx) All physical plan resolvers have to implement this entry method.

Methods inherited from class java.lang.Object

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

Constructor Detail

SamplingOptimizer

public SamplingOptimizer()

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