org.apache.hadoop.hive.serde2.columnar

Class ColumnarSerDeBase

java.lang.Object

org.apache.hadoop.hive.serde2.AbstractSerDe

org.apache.hadoop.hive.serde2.columnar.ColumnarSerDeBase

All Implemented Interfaces:

Deserializer, SerDe, Serializer

Direct Known Subclasses:

ColumnarSerDe, LazyBinaryColumnarSerDe

public abstract class ColumnarSerDeBase
extends AbstractSerDe

Field Summary

Fields

Modifier and Type	Field and Description
protected ObjectInspector	cachedObjectInspector
protected boolean	lastOperationDeserialize
protected boolean	lastOperationSerialize
protected long	serializedSize
protected SerDeStats	stats

Constructor Summary

Constructors

Constructor and Description
ColumnarSerDeBase()

Method Summary

Modifier and Type	Method and Description
java.lang.Object	deserialize(Writable blob) Deserialize an object out of a Writable blob.
ObjectInspector	getObjectInspector() Get the object inspector that can be used to navigate through the internal structure of the Object returned from deserialize(...).
SerDeStats	getSerDeStats() Returns statistics collected when serializing
java.lang.Class<? extends Writable>	getSerializedClass() Returns the Writable class that would be returned by the serialize method.
protected void	initialize(int size)

Methods inherited from class org.apache.hadoop.hive.serde2.AbstractSerDe

initialize, serialize

Methods inherited from class java.lang.Object

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

Field Detail

cachedObjectInspector

protected ObjectInspector cachedObjectInspector

serializedSize

protected long serializedSize

stats

protected SerDeStats stats

lastOperationSerialize

protected boolean lastOperationSerialize

lastOperationDeserialize

protected boolean lastOperationDeserialize

Constructor Detail

ColumnarSerDeBase

public ColumnarSerDeBase()

Method Detail

deserialize

public java.lang.Object deserialize(Writable blob)
                             throws SerDeException

Description copied from class: AbstractSerDe

Deserialize an object out of a Writable blob. In most cases, the return value of this function will be constant since the function will reuse the returned object. If the client wants to keep a copy of the object, the client needs to clone the returned value by calling ObjectInspectorUtils.getStandardObject().

Specified by:

deserialize in interface Deserializer

Specified by:

deserialize in class AbstractSerDe

Parameters:

blob - The Writable object containing a serialized object

Returns:

A Java object representing the contents in the blob.

Throws:

SerDeException

getSerDeStats

public SerDeStats getSerDeStats()

Description copied from class: AbstractSerDe

Returns statistics collected when serializing

Specified by:

getSerDeStats in interface Deserializer

Specified by:

getSerDeStats in interface Serializer

Specified by:

getSerDeStats in class AbstractSerDe

getSerializedClass

public java.lang.Class<? extends Writable> getSerializedClass()

Description copied from class: AbstractSerDe

Returns the Writable class that would be returned by the serialize method. This is used to initialize SequenceFile header.

Specified by:

getSerializedClass in interface Serializer

Specified by:

getSerializedClass in class AbstractSerDe

initialize

protected void initialize(int size)
                   throws SerDeException

Throws:

SerDeException

getObjectInspector

public ObjectInspector getObjectInspector()
                                   throws SerDeException

Description copied from class: AbstractSerDe

Get the object inspector that can be used to navigate through the internal structure of the Object returned from deserialize(...).

Specified by:

getObjectInspector in interface Deserializer

Specified by:

getObjectInspector in class AbstractSerDe

Throws:

SerDeException