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

Class NullScanTaskDispatcher

java.lang.Object

org.apache.hadoop.hive.ql.optimizer.physical.NullScanTaskDispatcher

All Implemented Interfaces:

Dispatcher

public class NullScanTaskDispatcher
extends Object
implements Dispatcher

Iterate over all tasks one by one and removes all input paths from task if conditions as defined in rules match.

Constructor Summary

Constructors

Constructor and Description
NullScanTaskDispatcher(PhysicalContext context, Map<Rule,NodeProcessor> rules)

Method Summary

Modifier and Type	Method and Description
Object	dispatch(Node nd, Stack<Node> stack, Object... nodeOutputs) Dispatcher function.

Methods inherited from class java.lang.Object

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

Constructor Detail

NullScanTaskDispatcher

public NullScanTaskDispatcher(PhysicalContext context,
                              Map<Rule,NodeProcessor> rules)

Method Detail

dispatch

public Object dispatch(Node nd,
                       Stack<Node> stack,
                       Object... nodeOutputs)
                throws SemanticException

Description copied from interface: Dispatcher

Dispatcher function.

Specified by:

dispatch in interface Dispatcher

Parameters:

nd - operator to process.

stack - operator stack to process.

nodeOutputs - The argument list of outputs from processing other nodes that are passed to this dispatcher from the walker.

Returns:

Object The return object from the processing call.

Throws:

SemanticException