Package org.apache.iotdb.db.mpp.execution.operator.source

Class AbstractSeriesAggregationScanOperator

java.lang.Object

org.apache.iotdb.db.mpp.execution.operator.source.AbstractSeriesAggregationScanOperator

All Implemented Interfaces:

java.lang.AutoCloseable, Operator, DataSourceOperator, SourceOperator

Direct Known Subclasses:

AlignedSeriesAggregationScanOperator, SeriesAggregationScanOperator

public abstract class AbstractSeriesAggregationScanOperator
extends java.lang.Object
implements DataSourceOperator

Field Summary

Fields

Modifier and Type	Field	Description
protected java.util.List<Aggregator>	aggregators
protected boolean	ascending
protected org.apache.iotdb.tsfile.read.common.TimeRange	curTimeRange
protected boolean	finished
protected org.apache.iotdb.tsfile.read.common.block.TsBlock	inputTsBlock
protected boolean	isGroupByQuery
protected OperatorContext	operatorContext
protected org.apache.iotdb.tsfile.read.common.block.TsBlockBuilder	resultTsBlockBuilder
protected SeriesScanUtil	seriesScanUtil
protected PlanNodeId	sourceId
protected int	subSensorSize
protected ITimeRangeIterator	timeRangeIterator

Fields inherited from interface org.apache.iotdb.db.mpp.execution.operator.Operator

NOT_BLOCKED

Constructor Summary

Constructors

Constructor	Description
AbstractSeriesAggregationScanOperator(PlanNodeId sourceId, OperatorContext context, SeriesScanUtil seriesScanUtil, int subSensorSize, java.util.List<Aggregator> aggregators, ITimeRangeIterator timeRangeIterator, boolean ascending, GroupByTimeParameter groupByTimeParameter, long maxReturnSize)

Method Summary

Modifier and Type	Method	Description
protected boolean	calcFromCachedData()
protected void	calcFromStatistics(org.apache.iotdb.tsfile.file.metadata.statistics.Statistics[] statistics)
long	calculateMaxPeekMemory()	We should also consider the memory used by its children operator, so the calculation logic may be like: long estimatedOfCurrentOperator = XXXXX; return max(estimatedOfCurrentOperator, child1.calculateMaxPeekMemory(), child2.calculateMaxPeekMemory(), ....)
long	calculateMaxReturnSize()
protected void	calculateNextAggregationResult()
long	calculateRetainedSizeAfterCallingNext()
protected boolean	canUseCurrentChunkStatistics()
protected boolean	canUseCurrentFileStatistics()
protected boolean	canUseCurrentPageStatistics()
OperatorContext	getOperatorContext()
PlanNodeId	getSourceId()
boolean	hasNext()
void	initQueryDataSource(QueryDataSource dataSource)
boolean	isFinished()	Is this operator completely finished processing and no more output TsBlock will be produced.
org.apache.iotdb.tsfile.read.common.block.TsBlock	next()	Gets next tsBlock from this operator.
protected boolean	readAndCalcFromChunk()
protected boolean	readAndCalcFromFile()
protected boolean	readAndCalcFromPage()
protected void	updateResultTsBlock()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.iotdb.db.mpp.execution.operator.Operator

close, isBlocked

Field Detail

sourceId

protected final PlanNodeId sourceId

operatorContext

protected final OperatorContext operatorContext

ascending

protected final boolean ascending

isGroupByQuery

protected final boolean isGroupByQuery

seriesScanUtil

protected SeriesScanUtil seriesScanUtil

subSensorSize

protected int subSensorSize

inputTsBlock

protected org.apache.iotdb.tsfile.read.common.block.TsBlock inputTsBlock

timeRangeIterator

protected final ITimeRangeIterator timeRangeIterator

curTimeRange

protected org.apache.iotdb.tsfile.read.common.TimeRange curTimeRange

aggregators

protected final java.util.List<Aggregator> aggregators

resultTsBlockBuilder

protected final org.apache.iotdb.tsfile.read.common.block.TsBlockBuilder resultTsBlockBuilder

finished

protected boolean finished

Constructor Detail

AbstractSeriesAggregationScanOperator

public AbstractSeriesAggregationScanOperator(PlanNodeId sourceId,
                                             OperatorContext context,
                                             SeriesScanUtil seriesScanUtil,
                                             int subSensorSize,
                                             java.util.List<Aggregator> aggregators,
                                             ITimeRangeIterator timeRangeIterator,
                                             boolean ascending,
                                             GroupByTimeParameter groupByTimeParameter,
                                             long maxReturnSize)

Method Detail

getSourceId

public PlanNodeId getSourceId()

Specified by:

getSourceId in interface SourceOperator

getOperatorContext

public OperatorContext getOperatorContext()

Specified by:

getOperatorContext in interface Operator

initQueryDataSource

public void initQueryDataSource(QueryDataSource dataSource)

Specified by:

initQueryDataSource in interface DataSourceOperator

calculateMaxPeekMemory

public long calculateMaxPeekMemory()

Description copied from interface: Operator

We should also consider the memory used by its children operator, so the calculation logic may be like: long estimatedOfCurrentOperator = XXXXX; return max(estimatedOfCurrentOperator, child1.calculateMaxPeekMemory(), child2.calculateMaxPeekMemory(), ....)

Each operator's MaxPeekMemory should also take retained size of each child operator into account.

Specified by:

calculateMaxPeekMemory in interface Operator

Returns:

estimated max memory footprint that the Operator Tree(rooted from this operator) will use while doing its own query processing

calculateMaxReturnSize

public long calculateMaxReturnSize()

Specified by:

calculateMaxReturnSize in interface Operator

Returns:

estimated max memory footprint for returned TsBlock when calling operator.next()

calculateRetainedSizeAfterCallingNext

public long calculateRetainedSizeAfterCallingNext()

Specified by:

calculateRetainedSizeAfterCallingNext in interface Operator

Returns:

each operator's retained size(including all its children's retained size) after calling its next() method

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Operator

Returns:

true if the operator has more data, otherwise false

next

public org.apache.iotdb.tsfile.read.common.block.TsBlock next()

Description copied from interface: Operator

Gets next tsBlock from this operator. If no data is currently available, return null.

Specified by:

next in interface Operator

isFinished

public boolean isFinished()

Description copied from interface: Operator

Is this operator completely finished processing and no more output TsBlock will be produced.

Specified by:

isFinished in interface Operator

calculateNextAggregationResult

protected void calculateNextAggregationResult()

updateResultTsBlock

protected void updateResultTsBlock()

calcFromCachedData

protected boolean calcFromCachedData()

calcFromStatistics

protected void calcFromStatistics(org.apache.iotdb.tsfile.file.metadata.statistics.Statistics[] statistics)

readAndCalcFromFile

protected boolean readAndCalcFromFile()
                               throws java.io.IOException

Throws:

java.io.IOException

readAndCalcFromChunk

protected boolean readAndCalcFromChunk()
                                throws java.io.IOException

Throws:

java.io.IOException

readAndCalcFromPage

protected boolean readAndCalcFromPage()
                               throws java.io.IOException

Throws:

java.io.IOException

canUseCurrentFileStatistics

protected boolean canUseCurrentFileStatistics()
                                       throws java.io.IOException

Throws:

java.io.IOException

canUseCurrentChunkStatistics

protected boolean canUseCurrentChunkStatistics()
                                        throws java.io.IOException

Throws:

java.io.IOException

canUseCurrentPageStatistics

protected boolean canUseCurrentPageStatistics()
                                       throws java.io.IOException

Throws:

java.io.IOException