com.metamatrix.query.processor.relational
Class LimitNode
java.lang.Object
com.metamatrix.query.processor.relational.RelationalNode
com.metamatrix.query.processor.relational.LimitNode
- All Implemented Interfaces:
- Describable, java.lang.Cloneable
public class LimitNode
- extends RelationalNode
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 |
Methods inherited from class com.metamatrix.query.processor.relational.RelationalNode |
addBatchRow, addChild, close, copy, createLookupMap, getBatchSize, getBufferManager, getChildDescriptionProperties, getChildPlans, getChildren, getClassName, getConnectionID, getContext, getDataManager, getElements, getEstimateNodeCardinality, getID, getLanguageObjects, getNodeStatistics, getParent, hasPendingRows, initialize, isBatchFull, isClosed, nextBatch, nodeToString, projectTuple, pullBatch, setContext, 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 |
LimitNode
public LimitNode(int nodeID,
Expression limitExpr,
Expression offsetExpr)
nextBatchDirect
protected TupleBatch nextBatchDirect()
throws BlockedException,
MetaMatrixComponentException,
MetaMatrixProcessingException
- Description copied from class:
RelationalNode
- Template method for subclasses to implement.
- Specified by:
nextBatchDirect
in class RelationalNode
- Returns:
-
- Throws:
BlockedException
MetaMatrixComponentException
MetaMatrixProcessingException
- if exception related to user input occured
open
public void open()
throws MetaMatrixComponentException,
MetaMatrixProcessingException
- Overrides:
open
in class RelationalNode
- Throws:
MetaMatrixComponentException
MetaMatrixProcessingException
reset
public void reset()
- Overrides:
reset
in class RelationalNode
getNodeString
protected void getNodeString(java.lang.StringBuffer buf)
- Overrides:
getNodeString
in class RelationalNode
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 RelationalNode
- Returns:
- Map of properties
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.
- Specified by:
clone
in class RelationalNode
getLimitExpr
public Expression getLimitExpr()
getOffsetExpr
public Expression getOffsetExpr()
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