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

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

static org.apache.commons.logging.Log

LOG

Constructor Summary

ColumnarSerDe()

Method Summary

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

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

LOG

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

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

tbl - table properties

Throws:

SerDeException

See Also:

Deserializer.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:

Serializer.serialize(Object, ObjectInspector)