org.apache.hadoop.hive.serde2.columnar

Class ColumnarSerDe

java.lang.Object

org.apache.hadoop.hive.serde2.AbstractSerDe

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

org.apache.hadoop.hive.serde2.columnar.ColumnarSerDe

All Implemented Interfaces:

Deserializer, SerDe, Serializer

Direct Known Subclasses:

VectorizedColumnarSerDe

public class ColumnarSerDe
extends ColumnarSerDeBase

ColumnarSerDe is used for columnar based storage supported by RCFile. ColumnarSerDe differentiate from LazySimpleSerDe in:
(1) ColumnarSerDe uses a ColumnarStruct as its lazy Object
(2) ColumnarSerDe initialize ColumnarStruct's field directly. But under the field level, it works like LazySimpleSerDe

Field Summary

Fields

Modifier and Type	Field and Description
static org.apache.commons.logging.Log	LOG
protected LazySerDeParameters	serdeParams

Fields inherited from class org.apache.hadoop.hive.serde2.columnar.ColumnarSerDeBase

cachedObjectInspector, lastOperationDeserialize, lastOperationSerialize, serializedSize, stats

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

configErrors

Constructor Summary

Constructors

Constructor and Description
ColumnarSerDe()

Method Summary

Methods

Modifier and Type	Method and Description
void	initialize(org.apache.hadoop.conf.Configuration conf, Properties tbl) Initialize the SerDe given the parameters.
org.apache.hadoop.io.Writable	serialize(Object obj, ObjectInspector objInspector) Serialize a row of data.
String	toString()

Methods inherited from class org.apache.hadoop.hive.serde2.columnar.ColumnarSerDeBase

deserialize, getObjectInspector, getSerDeStats, getSerializedClass, initialize

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

getConfigurationErrors, initialize

Methods inherited from class java.lang.Object

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

Field Detail

LOG

public static final org.apache.commons.logging.Log LOG

serdeParams

protected LazySerDeParameters serdeParams

Constructor Detail

ColumnarSerDe

public ColumnarSerDe()
              throws SerDeException

Throws:

SerDeException

Method Detail

toString

public String toString()

Overrides:

toString in class Object

initialize

public void initialize(org.apache.hadoop.conf.Configuration conf,
              Properties tbl)
                throws SerDeException

Initialize the SerDe given the parameters.

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

tbl - table properties

Throws:

SerDeException

See Also:

SerDe#initialize(Configuration, Properties)

serialize

public org.apache.hadoop.io.Writable serialize(Object obj,
                                      ObjectInspector objInspector)
                                        throws SerDeException

Serialize a row of data.

Specified by:

serialize in interface Serializer

Specified by:

serialize in class AbstractSerDe

Parameters:

obj - The row object

objInspector - The ObjectInspector for the row object

Returns:

The serialized Writable object

Throws:

SerDeException

See Also:

SerDe#serialize(Object, ObjectInspector)