com.bigdata.bop.controller

Class JVMNamedSubqueryOp

java.lang.Object

com.bigdata.bop.CoreBaseBOp

com.bigdata.bop.BOpBase

com.bigdata.bop.PipelineOp

com.bigdata.bop.controller.JVMNamedSubqueryOp

All Implemented Interfaces:

BOp, INamedSubqueryOp, ISingleThreadedOp, IPropertySet, Serializable, Cloneable

public class JVMNamedSubqueryOp
extends PipelineOp
implements INamedSubqueryOp, ISingleThreadedOp

Evaluation of a subquery, producing a named result set. This operator passes through any source binding sets without modification. The subquery is evaluated exactly once, the first time this operator is invoked for a given query plan. If some variables are known to be bound, then they should be rewritten into constants or their bindings should be inserted into the subquery using LET() operator.

This operator is NOT thread-safe. It relies on the query engine to provide synchronization for the "run-once" contract of the subquery. The operator MUST be run on the query controller.

Author:

Bryan Thompson

See Also:

JVMSolutionSetHashJoinOp, Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	JVMNamedSubqueryOp.Annotations

Field Summary

Fields inherited from class com.bigdata.bop.CoreBaseBOp

DEFAULT_INITIAL_CAPACITY

Fields inherited from interface com.bigdata.bop.BOp

NOANNS, NOARGS

Constructor Summary

Constructors

Constructor and Description
JVMNamedSubqueryOp(BOp[] args, Map<String,Object> annotations) Shallow copy constructor.
JVMNamedSubqueryOp(BOp[] args, NV... annotations)
JVMNamedSubqueryOp(JVMNamedSubqueryOp op) Deep copy constructor.

Method Summary

Methods

Modifier and Type	Method and Description
FutureTask<Void>	eval(BOpContext<IBindingSet> context) Return a FutureTask which computes the operator against the evaluation context.
BOpStats	newStats() Return a new object which can be used to collect statistics on the operator evaluation.

Methods inherited from class com.bigdata.bop.PipelineOp

assertAtOnceJavaHeapOp, assertMaxParallelOne, getChunkCapacity, getChunkOfChunksCapacity, getChunkTimeout, getMaxMemory, getMaxParallel, isAtOnceEvaluation, isBlockedEvaluation, isLastPassRequested, isPipelinedEvaluation, isReorderSolutions, isSharedState

Methods inherited from class com.bigdata.bop.BOpBase

__replaceArg, _clearProperty, _set, _setProperty, annotations, annotationsCopy, annotationsEqual, annotationsRef, argIterator, args, argsCopy, arity, clearAnnotations, clearProperty, deepCopy, deepCopy, get, getProperty, setArg, setProperty, setUnboundProperty, toArray, toArray

Methods inherited from class com.bigdata.bop.CoreBaseBOp

annotationsEqual, annotationsToString, annotationsToString, annotationValueToString, checkArgs, clone, equals, getEvaluationContext, getId, getProperty, getRequiredProperty, hashCode, indent, isController, mutation, shortenName, toShortString, toString, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

JVMNamedSubqueryOp

public JVMNamedSubqueryOp(JVMNamedSubqueryOp op)

Deep copy constructor.

JVMNamedSubqueryOp

public JVMNamedSubqueryOp(BOp[] args,
                  Map<String,Object> annotations)

Shallow copy constructor.

Parameters:

args -

annotations -

JVMNamedSubqueryOp

public JVMNamedSubqueryOp(BOp[] args,
                  NV... annotations)

Method Detail

newStats

public BOpStats newStats()

Description copied from class: PipelineOp

Return a new object which can be used to collect statistics on the operator evaluation. This may be overridden to return a more specific class depending on the operator.

Overrides:

newStats in class PipelineOp

eval

public FutureTask<Void> eval(BOpContext<IBindingSet> context)

Description copied from class: PipelineOp

Return a FutureTask which computes the operator against the evaluation context. The caller is responsible for executing the FutureTask (this gives them the ability to hook the completion of the computation).

Specified by:

eval in class PipelineOp

Parameters:

context - The evaluation context.

Returns:

The FutureTask which will compute the operator's evaluation.