org.apache.carbondata.hadoop.readsupport.impl

Class AbstractDictionaryDecodedReadSupport<T>

java.lang.Object

org.apache.carbondata.hadoop.readsupport.impl.AbstractDictionaryDecodedReadSupport<T>

All Implemented Interfaces:

CarbonReadSupport<T>

Direct Known Subclasses:

DictionaryDecodedReadSupportImpl

public abstract class AbstractDictionaryDecodedReadSupport<T>
extends Object
implements CarbonReadSupport<T>

Its an abstract class provides necessary information to decode dictionary data

Field Summary

Fields

Modifier and Type	Field and Description
protected CarbonColumn[]	carbonColumns carbon columns
protected DataType[]	dataTypes
protected Dictionary[]	dictionaries

Constructor Summary

Constructors

Constructor and Description
AbstractDictionaryDecodedReadSupport()

Method Summary

Modifier and Type	Method and Description
void	close() This method iwll be used to clear the dictionary cache and update access count for each column involved which will be used during eviction of columns from LRU cache if memory reaches threshold
void	intialize(CarbonColumn[] carbonColumns, AbsoluteTableIdentifier absoluteTableIdentifier) It would be instantiated in side the task so the dictionary would be loaded inside every mapper instead of driver.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.carbondata.hadoop.readsupport.CarbonReadSupport

readRow

Field Detail

dictionaries

protected Dictionary[] dictionaries

dataTypes

protected DataType[] dataTypes

carbonColumns

protected CarbonColumn[] carbonColumns

carbon columns

Constructor Detail

AbstractDictionaryDecodedReadSupport

public AbstractDictionaryDecodedReadSupport()

Method Detail

intialize

public void intialize(CarbonColumn[] carbonColumns,
                      AbsoluteTableIdentifier absoluteTableIdentifier)

It would be instantiated in side the task so the dictionary would be loaded inside every mapper instead of driver.

Specified by:

intialize in interface CarbonReadSupport<T>

Parameters:

carbonColumns -

absoluteTableIdentifier -

close

public void close()

This method iwll be used to clear the dictionary cache and update access count for each column involved which will be used during eviction of columns from LRU cache if memory reaches threshold

Specified by:

close in interface CarbonReadSupport<T>