org.apache.hadoop.hive.ql.exec
Class LimitOperator
java.lang.Object
org.apache.hadoop.hive.ql.exec.Operator<LimitDesc>
org.apache.hadoop.hive.ql.exec.LimitOperator
- All Implemented Interfaces:
- Serializable, Cloneable, Node
public class LimitOperator
- extends Operator<LimitDesc>
- implements Serializable
Limit operator implementation Limits the number of rows to be passed on.
- See Also:
- Serialized Form
Fields inherited from class org.apache.hadoop.hive.ql.exec.Operator |
alias, beginTime, childOperators, childOperatorsArray, childOperatorsTag, colExprMap, conf, counterNames, counterNameToEnum, counters, done, fatalErrorCntr, groupKeyObject, id, inputObjInspectors, inputRows, isLogInfoEnabled, LOG, numInputRowsCntr, numOutputRowsCntr, operatorId, out, outputObjInspector, outputRows, parentOperators, reporter, state, statsMap, timeTakenCntr, totalTime |
Methods inherited from class org.apache.hadoop.hive.ql.exec.Operator |
acceptLimitPushdown, allInitializedParentsAreClosed, areAllParentsInitialized, assignCounterNameToEnum, augmentPlan, checkFatalErrors, cleanUpInputFileChanged, cleanUpInputFileChangedOp, clone, close, columnNamesRowResolvedCanBeObtained, dump, dump, endGroup, fatalErrorMessage, flush, forward, getAdditionalCounters, getChildOperators, getChildren, getColumnExprMap, getConf, getConfiguration, getCounterNames, getCounterNameToEnum, getCounters, getDone, getExecContext, getGroupKeyObject, getIdentifier, getInputObjInspectors, getNextCntr, getNumChild, getNumParent, getOperatorId, getParentOperators, getSchema, getStats, getWrappedCounterName, incrCounter, initEvaluators, initEvaluators, initEvaluatorsAndReturnStruct, initialize, initialize, initializeChildren, initializeCounters, initializeLocalWork, initOperatorId, isUseBucketizedHiveInputFormat, jobClose, jobCloseOp, logStats, opAllowedAfterMapJoin, opAllowedBeforeMapJoin, opAllowedBeforeSortMergeJoin, opAllowedConvertMapJoin, passExecContext, preorderMap, process, processGroup, removeChild, removeChildAndAdoptItsChildren, removeChildren, removeParent, replaceChild, replaceParent, reset, resetId, resetLastEnumUsed, resetStats, setAlias, setChildOperators, setColumnExprMap, setConf, setCounterNames, setCounterNameToEnum, setDone, setExecContext, setGroupKeyObject, setId, setInputObjInspectors, setOperatorId, setOutputCollector, setParentOperators, setReporter, setSchema, setUseBucketizedHiveInputFormat, startGroup, supportAutomaticSortMergeJoin, supportSkewJoinOptimization, supportUnionRemoveOptimization, toString, toString, updateCounters |
limit
protected transient int limit
leastRow
protected transient int leastRow
currCount
protected transient int currCount
isMap
protected transient boolean isMap
LimitOperator
public LimitOperator()
initializeOp
protected void initializeOp(Configuration hconf)
throws HiveException
- Description copied from class:
Operator
- Operator specific initialization.
- Overrides:
initializeOp
in class Operator<LimitDesc>
- Throws:
HiveException
processOp
public void processOp(Object row,
int tag)
throws HiveException
- Description copied from class:
Operator
- Process the row.
- Specified by:
processOp
in class Operator<LimitDesc>
- Parameters:
row
- The object representing the row.tag
- The tag of the row usually means which parent this row comes from.
Rows with the same tag should have exactly the same rowInspector
all the time.
- Throws:
HiveException
getName
public String getName()
- Description copied from class:
Operator
- Implements the getName function for the Node Interface.
- Specified by:
getName
in interface Node
- Overrides:
getName
in class Operator<LimitDesc>
- Returns:
- the name of the operator
getOperatorName
public static String getOperatorName()
getType
public OperatorType getType()
- Description copied from class:
Operator
- Return the type of the specific operator among the
types in OperatorType.
- Specified by:
getType
in class Operator<LimitDesc>
- Returns:
- OperatorType.*
closeOp
public void closeOp(boolean abort)
throws HiveException
- Description copied from class:
Operator
- Operator specific close routine. Operators which inherents this class
should overwrite this funtion for their specific cleanup routine.
- Overrides:
closeOp
in class Operator<LimitDesc>
- Throws:
HiveException
Copyright © 2012 The Apache Software Foundation