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

Class OrcSerde

java.lang.Object

org.apache.hadoop.hive.serde2.AbstractSerDe

org.apache.hadoop.hive.ql.exec.vector.VectorizedSerde

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

All Implemented Interfaces:

Deserializer, Serializer

Direct Known Subclasses:

VectorizedOrcSerde

public class OrcSerde
extends VectorizedSerde

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

Field Summary

Fields

Modifier and Type	Field and Description
static String	COMPRESSION

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

configErrors

Constructor Summary

Constructors

Constructor and Description
OrcSerde()

Method Summary

Modifier and Type	Method and Description
Object	deserialize(org.apache.hadoop.io.Writable writable) Deserialize an object out of a Writable blob.
void	deserializeVector(Object rowBlob, int rowsInBatch, org.apache.hadoop.hive.ql.exec.vector.VectorizedRowBatch reuseBatch)
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.
Class<? extends org.apache.hadoop.io.Writable>	getSerializedClass() Returns the Writable class that would be returned by the serialize method.
void	initialize(org.apache.hadoop.conf.Configuration conf, Properties table) Initialize the HiveSerializer.
org.apache.hadoop.io.Writable	serialize(Object realRow, ObjectInspector inspector) Serialize an object by navigating inside the Object with the ObjectInspector.
org.apache.hadoop.io.Writable	serializeVector(org.apache.hadoop.hive.ql.exec.vector.VectorizedRowBatch vrg, ObjectInspector objInspector)

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

getConfigurationErrors, initialize, shouldStoreFieldsInMetastore

Methods inherited from class java.lang.Object

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

Field Detail

COMPRESSION

public static final String COMPRESSION

See Also:

Constant Field Values

Constructor Detail

OrcSerde

public OrcSerde()

Method Detail

initialize

public void initialize(org.apache.hadoop.conf.Configuration conf,
                       Properties table)

Description copied from class: AbstractSerDe

Initialize the HiveSerializer.

Specified by:

initialize in interface Deserializer

Specified by:

initialize in interface Serializer

Specified by:

initialize in class AbstractSerDe

Parameters:

conf - System properties. Can be null in compile time

table - table properties

getSerializedClass

public Class<? extends org.apache.hadoop.io.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

serialize

public org.apache.hadoop.io.Writable serialize(Object realRow,
                                               ObjectInspector inspector)

Description copied from class: AbstractSerDe

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

Specified by:

serialize in class AbstractSerDe

deserialize

public Object deserialize(org.apache.hadoop.io.Writable writable)
                   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:

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 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

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

Specified by:

getSerDeStats in class AbstractSerDe

Returns:

null

serializeVector

public org.apache.hadoop.io.Writable serializeVector(org.apache.hadoop.hive.ql.exec.vector.VectorizedRowBatch vrg,
                                                     ObjectInspector objInspector)
                                              throws SerDeException

Specified by:

serializeVector in class VectorizedSerde

Throws:

SerDeException

deserializeVector

public void deserializeVector(Object rowBlob,
                              int rowsInBatch,
                              org.apache.hadoop.hive.ql.exec.vector.VectorizedRowBatch reuseBatch)
                       throws SerDeException

Specified by:

deserializeVector in class VectorizedSerde

Throws:

SerDeException