CachedPriorityMergeReader (IoTDB Server 0.14.0-preview2 API)

java.lang.Object
- org.apache.iotdb.db.query.reader.universal.PriorityMergeReader
- - org.apache.iotdb.db.query.reader.universal.CachedPriorityMergeReader

All Implemented Interfaces:

org.apache.iotdb.tsfile.read.reader.IPointReader

Direct Known Subclasses:

CachedUnseqResourceMergeReader
```
public class CachedPriorityMergeReader
extends PriorityMergeReader
```
CachedPriorityMergeReader use a cache to reduce unnecessary heap updates and increase locality.

Nested Class Summary
- Nested classes/interfaces inherited from class org.apache.iotdb.db.query.reader.universal.PriorityMergeReader
  PriorityMergeReader.MergeReaderPriority

Field Summary
- Fields inherited from class org.apache.iotdb.db.query.reader.universal.PriorityMergeReader
  currentReadStopTime, heap

Constructor Summary

Constructors
Constructor Description

CachedPriorityMergeReader(org.apache.iotdb.tsfile.file.metadata.enums.TSDataType dataType)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`org.apache.iotdb.tsfile.read.TimeValuePair`	`currentTimeValuePair()`
`boolean`	`hasNextTimeValuePair()`
`org.apache.iotdb.tsfile.read.TimeValuePair`	`nextTimeValuePair()`

Methods inherited from class org.apache.iotdb.db.query.reader.universal.PriorityMergeReader
addReader, addReader, close, fillNullValue, getCurrentReadStopTime, updateHeap

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - CachedPriorityMergeReader
```
public CachedPriorityMergeReader(org.apache.iotdb.tsfile.file.metadata.enums.TSDataType dataType)
```
- Method Detail
  - hasNextTimeValuePair
```
public boolean hasNextTimeValuePair()
```
    Specified by:
    
    hasNextTimeValuePair in interface org.apache.iotdb.tsfile.read.reader.IPointReader
    
    Overrides:
    
    hasNextTimeValuePair in class PriorityMergeReader
  - nextTimeValuePair
```
public org.apache.iotdb.tsfile.read.TimeValuePair nextTimeValuePair()
                                                             throws java.io.IOException
```
    Specified by:
    
    nextTimeValuePair in interface org.apache.iotdb.tsfile.read.reader.IPointReader
    
    Overrides:
    
    nextTimeValuePair in class PriorityMergeReader
    
    Throws:
    
    java.io.IOException
  - currentTimeValuePair
```
public org.apache.iotdb.tsfile.read.TimeValuePair currentTimeValuePair()
                                                                throws java.io.IOException
```
    Specified by:
    
    currentTimeValuePair in interface org.apache.iotdb.tsfile.read.reader.IPointReader
    
    Overrides:
    
    currentTimeValuePair in class PriorityMergeReader
    
    Throws:
    
    java.io.IOException