org.apache.iotdb.db.query.aggregation

类 AggregateResult

java.lang.Object

org.apache.iotdb.db.query.aggregation.AggregateResult

直接已知子类:

AvgAggrResult, CountAggrResult, ExtremeAggrResult, FirstValueAggrResult, LastValueAggrResult, MaxTimeAggrResult, MaxValueAggrResult, MinTimeAggrResult, MinValueAggrResult, SumAggrResult

public abstract class AggregateResult
extends Object

字段概要

字段

限定符和类型	字段和说明
protected boolean	hasCandidateResult
protected TSDataType	resultDataType
static int	TIME_LENGTH_FOR_FIRST_VALUE

构造器概要

构造器

构造器和说明
AggregateResult(TSDataType resultDataType, AggregationType aggregationType) construct.

方法概要

限定符和类型	方法和说明
static AggregateResult	deserializeFrom(ByteBuffer buffer)
protected abstract void	deserializeSpecificFields(ByteBuffer buffer)
AggregationType	getAggregationType()
protected Binary	getBinaryValue()
protected boolean	getBooleanValue()
protected double	getDoubleValue()
protected float	getFloatValue()
protected int	getIntValue()
protected long	getLongValue()
abstract Object	getResult()
TSDataType	getResultDataType()
protected Object	getValue()
protected boolean	hasCandidateResult()
abstract boolean	hasFinalResult() Judge if aggregation results have been calculated.
boolean	isAscending() Whether the AggregationResult accepts data in time ascending order, if it returns false, the data should be passed in time descending order.
abstract void	merge(AggregateResult another) Merge another aggregateResult into this
void	reset()
protected abstract void	serializeSpecificFields(OutputStream outputStream)
void	serializeTo(OutputStream outputStream)
void	setBinaryValue(Binary binaryValue)
void	setBooleanValue(boolean booleanValue)
void	setDoubleValue(double doubleValue)
void	setFloatValue(float floatValue)
void	setIntValue(int intValue)
void	setLongValue(long longValue)
protected void	setValue(Object v) set an object.
String	toString()
abstract void	updateResultFromPageData(IBatchDataIterator batchIterator) Aggregate results cannot be calculated using Statistics directly, using the data in each page.
abstract void	updateResultFromPageData(IBatchDataIterator batchIterator, Predicate<Long> boundPredicate) Aggregate results cannot be calculated using Statistics directly, using the data in each page.
abstract void	updateResultFromStatistics(Statistics statistics) Calculate the aggregation using Statistics
abstract void	updateResultUsingTimestamps(long[] timestamps, int length, IReaderByTimestamp dataReader) This method calculates the aggregation using common timestamps of the cross series filter.
abstract void	updateResultUsingValues(long[] timestamps, int length, ValueIterator valueIterator) This method calculates the aggregation using values that have been calculated

从类继承的方法 java.lang.Object

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

字段详细资料

TIME_LENGTH_FOR_FIRST_VALUE

public static final int TIME_LENGTH_FOR_FIRST_VALUE

另请参阅:

常量字段值

resultDataType

protected TSDataType resultDataType

hasCandidateResult

protected boolean hasCandidateResult

构造器详细资料

AggregateResult

public AggregateResult(TSDataType resultDataType,
                       AggregationType aggregationType)

construct.

参数:

resultDataType - result data type.

方法详细资料

getResult

public abstract Object getResult()

updateResultFromStatistics

public abstract void updateResultFromStatistics(Statistics statistics)
                                         throws QueryProcessException

Calculate the aggregation using Statistics

参数:

statistics - chunkStatistics or pageStatistics

抛出:

QueryProcessException

updateResultFromPageData

public abstract void updateResultFromPageData(IBatchDataIterator batchIterator)
                                       throws IOException,
                                              QueryProcessException

Aggregate results cannot be calculated using Statistics directly, using the data in each page. This method is used in global aggregation query.

参数:

batchIterator - the data in Page

抛出:

IOException

QueryProcessException

updateResultFromPageData

public abstract void updateResultFromPageData(IBatchDataIterator batchIterator,
                                              Predicate<Long> boundPredicate)
                                       throws IOException

Aggregate results cannot be calculated using Statistics directly, using the data in each page. This method is used in GROUP BY aggregation query.

参数:

batchIterator - the data in Page

boundPredicate - used to judge whether the current timestamp is out of time range, returns true if it is.

抛出:

IOException

updateResultUsingTimestamps

public abstract void updateResultUsingTimestamps(long[] timestamps,
                                                 int length,
                                                 IReaderByTimestamp dataReader)
                                          throws IOException

This method calculates the aggregation using common timestamps of the cross series filter.

抛出:

IOException - TsFile data read error

updateResultUsingValues

public abstract void updateResultUsingValues(long[] timestamps,
                                             int length,
                                             ValueIterator valueIterator)

This method calculates the aggregation using values that have been calculated

hasFinalResult

public abstract boolean hasFinalResult()

Judge if aggregation results have been calculated. In other words, if the aggregated result does not need to compute the remaining data, it returns true.

返回:

If the aggregation result has been calculated return true, else return false.

merge

public abstract void merge(AggregateResult another)

Merge another aggregateResult into this

deserializeFrom

public static AggregateResult deserializeFrom(ByteBuffer buffer)

deserializeSpecificFields

protected abstract void deserializeSpecificFields(ByteBuffer buffer)

serializeTo

public void serializeTo(OutputStream outputStream)
                 throws IOException

抛出:

IOException

serializeSpecificFields

protected abstract void serializeSpecificFields(OutputStream outputStream)
                                         throws IOException

抛出:

IOException

reset

public void reset()

getValue

protected Object getValue()

setValue

protected void setValue(Object v)

set an object.

参数:

v - object value

getResultDataType

public TSDataType getResultDataType()

getBooleanValue

protected boolean getBooleanValue()

setBooleanValue

public void setBooleanValue(boolean booleanValue)

getIntValue

protected int getIntValue()

setIntValue

public void setIntValue(int intValue)

getLongValue

protected long getLongValue()

setLongValue

public void setLongValue(long longValue)

getFloatValue

protected float getFloatValue()

setFloatValue

public void setFloatValue(float floatValue)

getDoubleValue

protected double getDoubleValue()

setDoubleValue

public void setDoubleValue(double doubleValue)

getBinaryValue

protected Binary getBinaryValue()

setBinaryValue

public void setBinaryValue(Binary binaryValue)

hasCandidateResult

protected boolean hasCandidateResult()

toString

public String toString()

覆盖:

toString 在类中 Object

getAggregationType

public AggregationType getAggregationType()

isAscending

public boolean isAscending()

Whether the AggregationResult accepts data in time ascending order, if it returns false, the data should be passed in time descending order.