org.apache.hadoop.hive.serde2.lazybinary
Class LazyBinaryStruct

java.lang.Object
  org.apache.hadoop.hive.serde2.lazy.LazyObjectBase
      org.apache.hadoop.hive.serde2.lazybinary.LazyBinaryObject<OI>
          org.apache.hadoop.hive.serde2.lazybinary.LazyBinaryNonPrimitive<LazyBinaryStructObjectInspector>
              org.apache.hadoop.hive.serde2.lazybinary.LazyBinaryStruct

All Implemented Interfaces:

SerDeStatsStruct

public class LazyBinaryStruct
extends LazyBinaryNonPrimitive<LazyBinaryStructObjectInspector>
implements SerDeStatsStruct

LazyBinaryStruct is serialized as follows: start A B A B A B end bytes[] -> |-----|---------|--- ... ---|-----|---------| Section A is one null-byte, corresponding to eight struct fields in Section B. Each bit indicates whether the corresponding field is null (0) or not null (1). Each field is a LazyBinaryObject. Following B, there is another section A and B. This pattern repeats until the all struct fields are serialized.

Field Summary

Fields inherited from class org.apache.hadoop.hive.serde2.lazybinary.LazyBinaryNonPrimitive

bytes, length, start

Constructor Summary

protected

LazyBinaryStruct(LazyBinaryStructObjectInspector oi) Construct a LazyBinaryStruct object with an ObjectInspector.

Method Summary

Object	getField(int fieldID) Get one field out of the struct.
ArrayList<Object>	getFieldsAsList() Get the values of the fields as an ArrayList.
Object	getObject() If the LazyObjectBase is a primitive Object, then deserialize it and return the actual primitive Object.
long	getRawDataSerializedSize() Rerurns the serialized size of the object.
void	init(ByteArrayRef bytes, int start, int length) Set the data for this LazyObjectBase.

Methods inherited from class org.apache.hadoop.hive.serde2.lazybinary.LazyBinaryNonPrimitive

hashCode

Methods inherited from class java.lang.Object

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

Constructor Detail

LazyBinaryStruct

protected LazyBinaryStruct(LazyBinaryStructObjectInspector oi)

Construct a LazyBinaryStruct object with an ObjectInspector.

Method Detail

init

public void init(ByteArrayRef bytes,
                 int start,
                 int length)

Description copied from class: LazyObjectBase

Set the data for this LazyObjectBase. We take ByteArrayRef instead of byte[] so that we will be able to drop the reference to byte[] by a single assignment. The ByteArrayRef object can be reused across multiple rows.

Overrides:

init in class LazyBinaryNonPrimitive<LazyBinaryStructObjectInspector>

Parameters:

bytes - The wrapper of the byte[].

start - The start position inside the bytes.

length - The length of the data, starting from "start"

See Also:

ByteArrayRef

getField

public Object getField(int fieldID)

Get one field out of the struct. If the field is a primitive field, return the actual object. Otherwise return the LazyObject. This is because PrimitiveObjectInspector does not have control over the object used by the user - the user simply directly use the Object instead of going through Object PrimitiveObjectInspector.get(Object).

Parameters:

fieldID - The field ID

Returns:

The field as a LazyObject

getFieldsAsList

public ArrayList<Object> getFieldsAsList()

Get the values of the fields as an ArrayList.

Returns:

The values of the fields as an ArrayList.

getObject

public Object getObject()

Description copied from class: LazyObjectBase

If the LazyObjectBase is a primitive Object, then deserialize it and return the actual primitive Object. Otherwise (array, map, struct), return this.

Overrides:

getObject in class LazyBinaryNonPrimitive<LazyBinaryStructObjectInspector>

getRawDataSerializedSize

public long getRawDataSerializedSize()

Description copied from interface: SerDeStatsStruct

Rerurns the serialized size of the object.

Specified by:

getRawDataSerializedSize in interface SerDeStatsStruct