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

Class AbstractJoinTaskDispatcher

java.lang.Object

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

All Implemented Interfaces:

Dispatcher

Direct Known Subclasses:

CommonJoinTaskDispatcher, SortMergeJoinTaskDispatcher

public abstract class AbstractJoinTaskDispatcher
extends Object
implements Dispatcher

Common iteration methods for converting joins and sort-merge joins.

Field Summary

Fields

Modifier and Type	Field and Description
protected PhysicalContext	physicalContext

Constructor Summary

Constructors

Constructor and Description
AbstractJoinTaskDispatcher(PhysicalContext context)

Method Summary

Methods

Modifier and Type	Method and Description
Object	dispatch(Node nd, Stack<Node> stack, Object... nodeOutputs) Dispatcher function.
long	getTotalKnownInputSize(Context context, MapWork currWork, Map<String,ArrayList<String>> pathToAliases, HashMap<String,Long> aliasToSize)
abstract Task<? extends Serializable>	processCurrentTask(MapRedTask currTask, ConditionalTask conditionalTask, Context context)
protected void	replaceTask(Task<? extends Serializable> currTask, Task<? extends Serializable> newTask)
protected void	replaceTaskWithConditionalTask(Task<? extends Serializable> currTask, ConditionalTask cndTsk)

Methods inherited from class java.lang.Object

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

Field Detail

physicalContext

protected final PhysicalContext physicalContext

Constructor Detail

AbstractJoinTaskDispatcher

public AbstractJoinTaskDispatcher(PhysicalContext context)

Method Detail

processCurrentTask

public abstract Task<? extends Serializable> processCurrentTask(MapRedTask currTask,
                                              ConditionalTask conditionalTask,
                                              Context context)
                                                         throws SemanticException

Throws:

SemanticException

replaceTaskWithConditionalTask

protected void replaceTaskWithConditionalTask(Task<? extends Serializable> currTask,
                                  ConditionalTask cndTsk)

replaceTask

protected void replaceTask(Task<? extends Serializable> currTask,
               Task<? extends Serializable> newTask)

getTotalKnownInputSize

public long getTotalKnownInputSize(Context context,
                          MapWork currWork,
                          Map<String,ArrayList<String>> pathToAliases,
                          HashMap<String,Long> aliasToSize)
                            throws SemanticException

Throws:

SemanticException

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