org.apache.iotdb.tsfile.read.common

Class DescReadBatchData

java.lang.Object

org.apache.iotdb.tsfile.read.common.BatchData

org.apache.iotdb.tsfile.read.common.DescReadBatchData

Direct Known Subclasses:

DescReadWriteBatchData

public class DescReadBatchData
extends BatchData

This class is just for reading batch data reversely. The data source is from page reader. For example, the timeRet from pageReader is [1, 1000], It will be written in ascending sequence, but the sequence of reading will be 1000 -> 1.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.iotdb.tsfile.read.common.BatchData

BatchData.BatchDataType

Field Summary

Fields inherited from class org.apache.iotdb.tsfile.read.common.BatchData

batchDataType, binaryRet, booleanRet, capacity, CAPACITY_THRESHOLD, count, dataType, doubleRet, floatRet, intRet, longRet, readCurArrayIndex, readCurListIndex, timeRet, vectorRet, writeCurArrayIndex, writeCurListIndex

Constructor Summary

Constructors

Constructor and Description
DescReadBatchData()
DescReadBatchData(TSDataType dataType)

Method Summary

Modifier and Type	Method and Description
BatchData	flip() When put data, the writeIndex increases while the readIndex remains 0.
Object	getValueInTimestamp(long time)
boolean	hasCurrent()
void	next()
void	resetBatchData() This method is used to reset batch data when more than one group by aggregation functions visit the same batch data

Methods inherited from class org.apache.iotdb.tsfile.read.common.BatchData

currentTime, currentTsPrimitiveType, currentValue, getBatchDataIterator, getBatchDataIterator, getBatchDataType, getBinary, getBinaryByIndex, getBoolean, getBooleanByIndex, getDataType, getDouble, getDoubleByIndex, getFloat, getFloatByIndex, getInt, getIntByIndex, getLastPairBeforeOrEqualTimestamp, getLong, getLongByIndex, getMaxTimestamp, getMinTimestamp, getReadCurArrayIndex, getReadCurListIndex, getTimeByIndex, getVector, getVectorByIndex, init, isEmpty, length, putAnObject, putBinary, putBoolean, putDouble, putFloat, putInt, putLong, putVector, resetBatchData, serializeData, setBinary, setBoolean, setDataType, setDouble, setFloat, setInt, setLong, setTime, setVector

Methods inherited from class java.lang.Object

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

Constructor Detail

DescReadBatchData

public DescReadBatchData()

DescReadBatchData

public DescReadBatchData(TSDataType dataType)

Method Detail

hasCurrent

public boolean hasCurrent()

Overrides:

hasCurrent in class BatchData

next

public void next()

Overrides:

next in class BatchData

resetBatchData

public void resetBatchData()

Description copied from class: BatchData

This method is used to reset batch data when more than one group by aggregation functions visit the same batch data

Overrides:

resetBatchData in class BatchData

flip

public BatchData flip()

When put data, the writeIndex increases while the readIndex remains 0. For descending read, we need to read from writeIndex to 0 (set the readIndex to writeIndex)

Overrides:

flip in class BatchData

getValueInTimestamp

public Object getValueInTimestamp(long time)

Overrides:

getValueInTimestamp in class BatchData