org.apache.hadoop.hive.ql.io.orc

Class OrcSerde

java.lang.Object

org.apache.hadoop.hive.ql.io.orc.OrcSerde

All Implemented Interfaces:

Deserializer, SerDe, Serializer

public class OrcSerde
extends java.lang.Object
implements SerDe

A serde class for ORC. It transparently passes the object to/from the ORC file reader/writer.

Constructor Summary

Constructors

Constructor and Description
OrcSerde()

Method Summary

Modifier and Type	Method and Description
java.lang.Object	deserialize(Writable writable) 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() Always returns null, since serialized size doesn't make sense in the context of ORC files.
java.lang.Class<? extends Writable>	getSerializedClass() Returns the Writable class that would be returned by the serialize method.
void	initialize(Configuration conf, java.util.Properties table) Initialize the HiveDeserializer.
Writable	serialize(java.lang.Object realRow, ObjectInspector inspector) Serialize an object by navigating inside the Object with the ObjectInspector.

Methods inherited from class java.lang.Object

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

Constructor Detail

OrcSerde

public OrcSerde()

Method Detail

initialize

public void initialize(Configuration conf,
                       java.util.Properties table)

Description copied from interface: Deserializer

Initialize the HiveDeserializer.

Specified by:

initialize in interface Deserializer

Specified by:

initialize in interface Serializer

Parameters:

conf - System properties

table - table properties

getSerializedClass

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

Description copied from interface: Serializer

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

serialize

public Writable serialize(java.lang.Object realRow,
                          ObjectInspector inspector)

Description copied from interface: Serializer

Serialize an object by navigating inside the Object with the ObjectInspector. In most cases, the return value of this function will be constant since the function will reuse the Writable object. If the client wants to keep a copy of the Writable, the client needs to clone the returned value.

Specified by:

serialize in interface Serializer

deserialize

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

Description copied from interface: Deserializer

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 returnDeserializered value by calling ObjectInspectorUtils.getStandardObject().

Specified by:

deserialize in interface Deserializer

Parameters:

writable - The Writable object containing a serialized object

Returns:

A Java object representing the contents in the blob.

Throws:

SerDeException

getObjectInspector

public ObjectInspector getObjectInspector()
                                   throws SerDeException

Description copied from interface: Deserializer

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

Throws:

SerDeException

getSerDeStats

public SerDeStats getSerDeStats()

Always returns null, since serialized size doesn't make sense in the context of ORC files.

Specified by:

getSerDeStats in interface Deserializer

Specified by:

getSerDeStats in interface Serializer

Returns:

null