org.apache.hadoop.hive.ql.lib
Interface GraphWalker

All Known Implementing Classes:

ColumnPruner.ColumnPrunerWalker, DefaultGraphWalker, GenMapRedWalker, PreOrderWalker, TaskGraphWalker

public interface GraphWalker

Interface for operator graph walker.

Method Summary

void	startWalking(Collection<Node> startNodes, HashMap<Node,Object> nodeOutput) starting point for walking.

Method Detail

startWalking

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

starting point for walking.

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