org.apache.hadoop.hive.ql.udf.generic

Class AbstractGenericUDFEWAHBitmapBop

java.lang.Object

org.apache.hadoop.hive.ql.udf.generic.GenericUDF

org.apache.hadoop.hive.ql.udf.generic.AbstractGenericUDFEWAHBitmapBop

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

Direct Known Subclasses:

GenericUDFEWAHBitmapAnd, GenericUDFEWAHBitmapOr

public abstract class AbstractGenericUDFEWAHBitmapBop
extends GenericUDF

An abstract class for a UDF that performs a binary operation between two EWAH-compressed bitmaps. For example: Bitmap OR and AND operations between two EWAH-compressed bitmaps.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.hive.ql.udf.generic.GenericUDF

GenericUDF.DeferredJavaObject, GenericUDF.DeferredObject

Field Summary

Fields

Modifier and Type	Field and Description
protected java.util.ArrayList<java.lang.Object>	ret

Method Summary

Modifier and Type	Method and Description
protected abstract com.googlecode.javaewah.EWAHCompressedBitmap	bitmapBop(com.googlecode.javaewah.EWAHCompressedBitmap bitmap1, com.googlecode.javaewah.EWAHCompressedBitmap bitmap2)
protected java.util.List<LongWritable>	bitmapToWordArray(com.googlecode.javaewah.EWAHCompressedBitmap bitmap)
java.lang.Object	evaluate(GenericUDF.DeferredObject[] arguments) Evaluate the GenericUDF with the arguments.
java.lang.String	getDisplayString(java.lang.String[] children) Get the String to be displayed in explain.
ObjectInspector	initialize(ObjectInspector[] arguments) Initialize this GenericUDF.
protected com.googlecode.javaewah.EWAHCompressedBitmap	wordArrayToBitmap(java.lang.Object b)

Methods inherited from class org.apache.hadoop.hive.ql.udf.generic.GenericUDF

close, configure, getRequiredFiles, getRequiredJars, initializeAndFoldConstants

Methods inherited from class java.lang.Object

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

Field Detail

ret

protected final java.util.ArrayList<java.lang.Object> ret

Method Detail

initialize

public ObjectInspector initialize(ObjectInspector[] arguments)
                           throws UDFArgumentException

Description copied from class: GenericUDF

Initialize this GenericUDF. This will be called once and only once per GenericUDF instance.

Specified by:

initialize in class GenericUDF

Parameters:

arguments - The ObjectInspector for the arguments

Returns:

The ObjectInspector for the return value

Throws:

UDFArgumentException - Thrown when arguments have wrong types, wrong length, etc.

bitmapBop

protected abstract com.googlecode.javaewah.EWAHCompressedBitmap bitmapBop(com.googlecode.javaewah.EWAHCompressedBitmap bitmap1,
                                                                          com.googlecode.javaewah.EWAHCompressedBitmap bitmap2)

evaluate

public java.lang.Object evaluate(GenericUDF.DeferredObject[] arguments)
                          throws HiveException

Description copied from class: GenericUDF

Evaluate the GenericUDF with the arguments.

Specified by:

evaluate in class GenericUDF

Parameters:

arguments - The arguments as DeferedObject, use DeferedObject.get() to get the actual argument Object. The Objects can be inspected by the ObjectInspectors passed in the initialize call.

Returns:

The

Throws:

HiveException

wordArrayToBitmap

protected com.googlecode.javaewah.EWAHCompressedBitmap wordArrayToBitmap(java.lang.Object b)

bitmapToWordArray

protected java.util.List<LongWritable> bitmapToWordArray(com.googlecode.javaewah.EWAHCompressedBitmap bitmap)

getDisplayString

public java.lang.String getDisplayString(java.lang.String[] children)

Description copied from class: GenericUDF

Get the String to be displayed in explain.

Specified by:

getDisplayString in class GenericUDF