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

Class SingleInputAggregationOperator

java.lang.Object

org.apache.iotdb.db.mpp.execution.operator.process.SingleInputAggregationOperator

All Implemented Interfaces:

java.lang.AutoCloseable, Operator, ProcessOperator

Direct Known Subclasses:

RawDataAggregationOperator, SlidingWindowAggregationOperator

public abstract class SingleInputAggregationOperator
extends java.lang.Object
implements ProcessOperator

Field Summary

Fields

Modifier and Type	Field	Description
protected java.util.List<Aggregator>	aggregators
protected boolean	ascending
protected boolean	canCallNext
protected Operator	child
protected org.apache.iotdb.tsfile.read.common.TimeRange	curTimeRange
protected org.apache.iotdb.tsfile.read.common.block.TsBlock	inputTsBlock
protected long	maxRetainedSize
protected long	maxReturnSize
protected OperatorContext	operatorContext
protected org.apache.iotdb.tsfile.read.common.block.TsBlockBuilder	resultTsBlockBuilder
protected ITimeRangeIterator	timeRangeIterator

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

NOT_BLOCKED

Constructor Summary

Constructors

Constructor	Description
SingleInputAggregationOperator(OperatorContext operatorContext, java.util.List<Aggregator> aggregators, Operator child, boolean ascending, ITimeRangeIterator timeRangeIterator, long maxReturnSize)

Method Summary

Modifier and Type	Method	Description
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 abstract boolean	calculateNextAggregationResult()
long	calculateRetainedSizeAfterCallingNext()
void	close()	This method will always be called before releasing the Operator reference.
OperatorContext	getOperatorContext()
boolean	hasNext()
com.google.common.util.concurrent.ListenableFuture<?>	isBlocked()	Returns a future that will be completed when the operator becomes unblocked.
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 void	updateResultTsBlock()

Methods inherited from class java.lang.Object

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

Field Detail

operatorContext

protected final OperatorContext operatorContext

ascending

protected final boolean ascending

child

protected final Operator child

inputTsBlock

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

canCallNext

protected boolean canCallNext

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

maxRetainedSize

protected final long maxRetainedSize

maxReturnSize

protected final long maxReturnSize

Constructor Detail

SingleInputAggregationOperator

public SingleInputAggregationOperator(OperatorContext operatorContext,
                                      java.util.List<Aggregator> aggregators,
                                      Operator child,
                                      boolean ascending,
                                      ITimeRangeIterator timeRangeIterator,
                                      long maxReturnSize)

Method Detail

getOperatorContext

public OperatorContext getOperatorContext()

Specified by:

getOperatorContext in interface Operator

isBlocked

public com.google.common.util.concurrent.ListenableFuture<?> isBlocked()

Description copied from interface: Operator

Returns a future that will be completed when the operator becomes unblocked. If the operator is not blocked, this method should return NOT_BLOCKED.

Specified by:

isBlocked in interface Operator

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

close

public void close()
           throws java.lang.Exception

Description copied from interface: Operator

This method will always be called before releasing the Operator reference.

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface Operator

Throws:

java.lang.Exception

calculateNextAggregationResult

protected abstract boolean calculateNextAggregationResult()

updateResultTsBlock

protected void updateResultTsBlock()

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