org.apache.hadoop.hive.ql.parse
Class GenTezWorkWalker

java.lang.Object
  org.apache.hadoop.hive.ql.lib.DefaultGraphWalker
      org.apache.hadoop.hive.ql.parse.GenTezWorkWalker

All Implemented Interfaces:

GraphWalker

public class GenTezWorkWalker
extends DefaultGraphWalker

Walks the operator tree in DFS fashion.

Field Summary

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

dispatcher, opStack, retMap, toWalk

Constructor Summary

GenTezWorkWalker(Dispatcher disp, GenTezProcContext ctx)
constructor of the walker - the dispatcher is passed.

Method Summary

void	startWalking(Collection<Node> startNodes, HashMap<Node,Object> nodeOutput) starting point for walking.
void	walk(Node nd) Walk the given operator.

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

dispatch, dispatchAndReturn, getDispatchedList, getToWalk

Methods inherited from class java.lang.Object

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

Constructor Detail

GenTezWorkWalker

public GenTezWorkWalker(Dispatcher disp,
                        GenTezProcContext ctx)

constructor of the walker - the dispatcher is passed.

Parameters:

disp - the dispatcher to be called for each node visited

ctx - the context where we'll set the current root operator

Method Detail

startWalking

public void startWalking(Collection<Node> startNodes,
                         HashMap<Node,Object> nodeOutput)
                  throws SemanticException

starting point for walking.

Specified by:

startWalking in interface GraphWalker

Overrides:

startWalking in class DefaultGraphWalker

Parameters:

startNodes - list of starting operators

nodeOutput - If this parameter is not null, the call to the function returns the map from node to objects returned by the processors.

Throws:

SemanticException

walk

public void walk(Node nd)
          throws SemanticException

Walk the given operator.

Overrides:

walk in class DefaultGraphWalker

Parameters:

nd - operator being walked

Throws:

SemanticException