org.apache.hadoop.hive.ql.optimizer

Class ColumnPruner.ColumnPrunerWalker

java.lang.Object

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

org.apache.hadoop.hive.ql.optimizer.ColumnPruner.ColumnPrunerWalker

All Implemented Interfaces:

GraphWalker

Enclosing class:

ColumnPruner

public static class ColumnPruner.ColumnPrunerWalker
extends DefaultGraphWalker

Walks the op tree in post order fashion (skips selects with file sink or script op children).

Field Summary

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

dispatcher, opQueue, opStack, retMap, toWalk

Constructor Summary

Constructors

Constructor and Description
ColumnPrunerWalker(Dispatcher disp)

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

ColumnPrunerWalker

public ColumnPrunerWalker(Dispatcher disp)

Method Detail

walk

protected void walk(Node nd)
             throws SemanticException

Walk the given operator.

Overrides:

walk in class DefaultGraphWalker

Parameters:

nd - current operator in the graph

Throws:

SemanticException