org.apache.hadoop.hive.serde2.columnar

Class ColumnarStruct

java.lang.Object

org.apache.hadoop.hive.serde2.columnar.ColumnarStructBase

org.apache.hadoop.hive.serde2.columnar.ColumnarStruct

All Implemented Interfaces:

SerDeStatsStruct, StructObject

public class ColumnarStruct
extends ColumnarStructBase

ColumnarStruct is different from LazyStruct in that ColumnarStruct's field Object get parsed at its initialize time when call ColumnarStructBase.init(BytesRefArrayWritable cols), while LazyStruct parse fields in a lazy way.

Field Summary

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

prjColIDs

Constructor Summary

Constructors

Constructor and Description
ColumnarStruct(ObjectInspector oi, List<Integer> notSkippedColumnIDs, org.apache.hadoop.io.Text nullSequence) Construct a ColumnarStruct object with the TypeInfo.

Method Summary

Modifier and Type	Method and Description
protected LazyObjectBase	createLazyObjectBase(ObjectInspector objectInspector) create the lazy object for this field
protected int	getLength(ObjectInspector objectInspector, ByteArrayRef cachedByteArrayRef, int start, int fieldLen) Check if the object is null and return the length of the stream

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

getField, getFieldsAsList, getRawDataSerializedSize, init

Methods inherited from class java.lang.Object

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

Constructor Detail

ColumnarStruct

public ColumnarStruct(ObjectInspector oi,
                      List<Integer> notSkippedColumnIDs,
                      org.apache.hadoop.io.Text nullSequence)

Construct a ColumnarStruct object with the TypeInfo. It creates the first level object at the first place

Parameters:

oi - the ObjectInspector representing the type of this LazyStruct.

notSkippedColumnIDs - the column ids that should not be skipped

Method Detail

getLength

protected int getLength(ObjectInspector objectInspector,
                        ByteArrayRef cachedByteArrayRef,
                        int start,
                        int fieldLen)

Description copied from class: ColumnarStructBase

Check if the object is null and return the length of the stream

Specified by:

getLength in class ColumnarStructBase

cachedByteArrayRef - the bytes of the object

start - the start offset

fieldLen - the length

Returns:

-1 for null, >=0 for length

createLazyObjectBase

protected LazyObjectBase createLazyObjectBase(ObjectInspector objectInspector)

Description copied from class: ColumnarStructBase

create the lazy object for this field

Specified by:

createLazyObjectBase in class ColumnarStructBase

Parameters:

objectInspector - the object inspector for the field

Returns:

the lazy object for the field