com.metamatrix.query.processor.relational
Class DependentAccessNode

java.lang.Object
  com.metamatrix.query.processor.relational.RelationalNode
      com.metamatrix.query.processor.relational.AccessNode
          com.metamatrix.query.processor.relational.DependentAccessNode

All Implemented Interfaces:

Describable, java.lang.Cloneable

public class DependentAccessNode
extends AccessNode

Takes a query with 1 or more dependent sets from 1 or more sources and creates a series of commands. Dependent sets from the same source are treated as a special case. If there are multiple batches from that source, we will create replacement criteria in lock step - rather than forming the full cartesian product space. This implementation assumes that ordering will be respected above the access node and that the incoming dependent tuple values are already sorted.

Field Summary

Fields inherited from interface com.metamatrix.query.processor.Describable

PROP_BINDINGS, PROP_CHILDREN, PROP_CONDITIONS, PROP_CRITERIA, PROP_DATA_COL, PROP_DEFAULT, PROP_DEFAULT_PROGRAM, PROP_ELSE, PROP_ENCODING, PROP_EXECUTION_PLAN, PROP_EXPRESSION, PROP_FORMATTED, PROP_GROUP, PROP_GROUP_COLS, PROP_IN_MEMORY, PROP_INTO_GROUP, PROP_IS_STAGING, PROP_JOIN_CRITERIA, PROP_JOIN_STRATEGY, PROP_JOIN_TYPE, PROP_MESSAGE, PROP_MODEL_NAME, PROP_NAMESPACE, PROP_NAMESPACE_DECL, PROP_NODE_COST_ESTIMATES, PROP_NODE_STATS_LIST, PROP_NODE_STATS_PROPS, PROP_OPTIONAL, PROP_OUTPUT_COLS, PROP_PROGRAM, PROP_PROGRAMS, PROP_RECURSE_DIR, PROP_REMOVE_DUPS, PROP_RESULT_SET, PROP_ROW_LIMIT, PROP_ROW_OFFSET, PROP_SELECT_COLS, PROP_SORT_COLS, PROP_SQL, PROP_TAG, PROP_THEN, PROP_TYPE, PROP_VARIABLE

Constructor Summary

DependentAccessNode(int nodeID)

Method Summary

java.lang.Object	clone() All the implementation of Cloneable interface need to implement clone() method.
void	close()
java.util.Map	getDescriptionProperties() Get a description as a set of properties of primitive types such as String, Integer, etc.
int	getMaxSetSize()
protected boolean	hasNextCommand()
protected boolean	prepareNextCommand(Command atomicCommand)
void	reset()
void	setMaxSetSize(int maxSize)

Methods inherited from class com.metamatrix.query.processor.relational.AccessNode

copy, getCommand, getConnectorBindingId, getModelName, getNodeString, nextBatchDirect, open, setCommand, setConnectorBindingId, setModelName, setShouldEvaluateExpressions

Methods inherited from class com.metamatrix.query.processor.relational.RelationalNode

addBatchRow, addChild, copy, createLookupMap, getBatchSize, getBufferManager, getChildDescriptionProperties, getChildPlans, getChildren, getClassName, getConnectionID, getContext, getDataManager, getElements, getEstimateNodeCardinality, getID, getNodeStatistics, getParent, initialize, isBatchFull, isClosed, nextBatch, nodeToString, projectTuple, pullBatch, setElements, setEstimateDepAccessCardinality, setEstimateDepJoinCost, setEstimateJoinCost, setEstimateNodeCardinality, setEstimateNodeSetSize, setID, setParent, terminateBatches, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

DependentAccessNode

public DependentAccessNode(int nodeID)

Method Detail

close

public void close()
           throws MetaMatrixComponentException

Overrides:

close in class AccessNode

Throws:

MetaMatrixComponentException

See Also:

AccessNode.close()

reset

public void reset()

Overrides:

reset in class AccessNode

clone

public java.lang.Object clone()

Description copied from class: RelationalNode

All the implementation of Cloneable interface need to implement clone() method. The plan is only clonable in the pre-execution stage, not the execution state (things like program state, result sets, etc). It's only safe to call that method in between query processings, in other words, it's only safe to call clone() on a plan after nextTuple() returns null, meaning the plan has finished processing.

Overrides:

clone in class AccessNode

getDescriptionProperties

public java.util.Map getDescriptionProperties()

Description copied from interface: Describable

Get a description as a set of properties of primitive types such as String, Integer, etc.

Specified by:

getDescriptionProperties in interface Describable

Overrides:

getDescriptionProperties in class AccessNode

Returns:

Map of properties

getMaxSetSize

public int getMaxSetSize()

Returns:

Returns the maxSize.

setMaxSetSize

public void setMaxSetSize(int maxSize)

Parameters:

maxSize - The maxSize to set.

prepareNextCommand

protected boolean prepareNextCommand(Command atomicCommand)
                              throws MetaMatrixComponentException,
                                     MetaMatrixProcessingException

Overrides:

prepareNextCommand in class AccessNode

Throws:

MetaMatrixComponentException

MetaMatrixProcessingException

See Also:

AccessNode.prepareNextCommand(com.metamatrix.query.sql.lang.Command)

hasNextCommand

protected boolean hasNextCommand()

Overrides:

hasNextCommand in class AccessNode

See Also:

AccessNode.hasNextCommand()