org.apache.hadoop.hive.ql.parse

Class GenMapRedWalker

java.lang.Object

org.apache.hadoop.hive.ql.lib.DefaultGraphWalker

org.apache.hadoop.hive.ql.parse.GenMapRedWalker

All Implemented Interfaces:

GraphWalker

public class GenMapRedWalker
extends DefaultGraphWalker

Walks the operator tree in pre order fashion.

Field Summary

Fields inherited from class org.apache.hadoop.hive.ql.lib.DefaultGraphWalker

dispatcher, opQueue, opStack, retMap, toWalk

Constructor Summary

Constructors

Constructor and Description
GenMapRedWalker(Dispatcher disp) constructor of the walker - the dispatcher is passed.

Method Summary

Modifier and Type	Method and Description
protected void	walk(Node nd) Walk the given operator.

Methods inherited from class org.apache.hadoop.hive.ql.lib.DefaultGraphWalker

dispatch, dispatchAndReturn, getDispatchedList, startWalking

Methods inherited from class java.lang.Object

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

Constructor Detail

GenMapRedWalker

public GenMapRedWalker(Dispatcher disp)

constructor of the walker - the dispatcher is passed.

Parameters:

disp - the dispatcher to be called for each node visited

Method Detail

walk

protected void walk(Node nd)
             throws SemanticException

Walk the given operator.

Overrides:

walk in class DefaultGraphWalker

Parameters:

nd - operator being walked

Throws:

SemanticException