org.apache.hadoop.hive.serde2

Interface Deserializer

All Known Implementing Classes:

AbstractDeserializer, AbstractEncodingAwareSerDe, AbstractSerDe, AccumuloSerDe, ArrowColumnarBatchSerDe, AvroSerDe, BinarySortableSerDe, BinarySortableSerDeWithEndPrefix, ByteStreamTypedSerDe, ColumnarSerDe, ColumnarSerDeBase, DelimitedJSONSerDe, DruidSerDe, DynamicSerDe, HBaseSerDe, HCatRecordSerDe, JdbcSerDe, JsonSerDe, JsonSerDe, LazyBinaryColumnarSerDe, LazyBinarySerDe, LazyBinarySerDe2, LazySimpleSerDe, MetadataTypedColumnsetSerDe, MultiDelimitSerDe, NullStructSerDe, OpenCSVSerde, OrcSerde, ParquetHiveSerDe, RegexSerDe, RegexSerDe, S3LogDeserializer, ThriftByteStreamTypedSerDe, ThriftDeserializer, ThriftJDBCBinarySerDe, TypedBytesSerDe, TypedSerDe, VectorizedOrcSerde, VectorizedSerde

public interface Deserializer

HiveDeserializer is used to deserialize the data from hadoop Writable to a custom java object that can be of any type that the developer wants. HiveDeserializer also provides the ObjectInspector which can be used to inspect the internal structure of the object (that is returned by deserialize function). All deserializers should extend the abstract class AbstractDeserializer. The interface is necessary for SerDes to be able to implement both Serializer and Deserializer.

Method Summary

Modifier and Type	Method and Description
Object	deserialize(org.apache.hadoop.io.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
void	initialize(org.apache.hadoop.conf.Configuration conf, Properties tbl) Initialize the HiveDeserializer.

Method Detail

initialize

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

Initialize the HiveDeserializer.

Parameters:

conf - System properties

tbl - table properties

Throws:

SerDeException

deserialize

Object deserialize(org.apache.hadoop.io.Writable blob)
            throws SerDeException

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 deserialized value by calling ObjectInspectorUtils.getStandardObject().

Parameters:

blob - The Writable object containing a serialized object

Returns:

A Java object representing the contents in the blob.

Throws:

SerDeException

getObjectInspector

ObjectInspector getObjectInspector()
                            throws SerDeException

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

Throws:

SerDeException

getSerDeStats

SerDeStats getSerDeStats()

Returns statistics collected when serializing