public class SelectOperator extends Operator<SelectDesc> implements java.io.Serializable
Operator.OperatorFunc, Operator.ProgressCounter, Operator.State
Modifier and Type | Field and Description |
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protected ExprNodeEvaluator[] |
eval |
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
Constructor and Description |
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SelectOperator() |
Modifier and Type | Method and Description |
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boolean |
acceptLimitPushdown()
used for LimitPushdownOptimizer
if all of the operators between limit and reduce-sink does not remove any input rows
in the range of limit count, limit can be pushed down to reduce-sink operator.
|
boolean |
columnNamesRowResolvedCanBeObtained() |
java.lang.String |
getName()
Implements the getName function for the Node Interface.
|
static java.lang.String |
getOperatorName() |
OperatorType |
getType()
Return the type of the specific operator among the
types in OperatorType.
|
protected void |
initializeOp(Configuration hconf)
Operator specific initialization.
|
void |
processOp(java.lang.Object row,
int tag)
Process the row.
|
boolean |
supportAutomaticSortMergeJoin()
Whether this operator supports automatic sort merge join.
|
boolean |
supportSkewJoinOptimization() |
boolean |
supportUnionRemoveOptimization() |
allInitializedParentsAreClosed, areAllParentsInitialized, assignCounterNameToEnum, augmentPlan, checkFatalErrors, cleanUpInputFileChanged, cleanUpInputFileChangedOp, clone, close, closeOp, 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, toString, toString, updateCounters
protected transient ExprNodeEvaluator[] eval
protected void initializeOp(Configuration hconf) throws HiveException
Operator
initializeOp
in class Operator<SelectDesc>
HiveException
public void processOp(java.lang.Object row, int tag) throws HiveException
Operator
processOp
in class Operator<SelectDesc>
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.HiveException
public java.lang.String getName()
Operator
getName
in interface Node
getName
in class Operator<SelectDesc>
public static java.lang.String getOperatorName()
public OperatorType getType()
Operator
getType
in class Operator<SelectDesc>
public boolean supportSkewJoinOptimization()
supportSkewJoinOptimization
in class Operator<SelectDesc>
public boolean columnNamesRowResolvedCanBeObtained()
columnNamesRowResolvedCanBeObtained
in class Operator<SelectDesc>
public boolean supportAutomaticSortMergeJoin()
Operator
supportAutomaticSortMergeJoin
in class Operator<SelectDesc>
public boolean supportUnionRemoveOptimization()
supportUnionRemoveOptimization
in class Operator<SelectDesc>
public boolean acceptLimitPushdown()
Operator
acceptLimitPushdown
in class Operator<SelectDesc>
Copyright © 2012 The Apache Software Foundation