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

java.lang.Object
  org.apache.hadoop.hive.ql.udf.generic.GenericUDF
      org.apache.hadoop.hive.ql.udf.generic.GenericUDFBaseUnary

All Implemented Interfaces:

Closeable

Direct Known Subclasses:

GenericUDFOPNegative, GenericUDFOPPositive

public abstract class GenericUDFBaseUnary
extends GenericUDF

Nested Class Summary

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

GenericUDF.DeferredJavaObject, GenericUDF.DeferredObject

Field Summary

protected ByteWritable	byteWritable
protected ObjectInspectorConverters.Converter	converter
protected HiveDecimalWritable	decimalWritable
protected DoubleWritable	doubleWritable
protected org.apache.hadoop.io.FloatWritable	floatWritable
protected org.apache.hadoop.io.IntWritable	intWritable
protected org.apache.hadoop.io.LongWritable	longWritable
protected String	opDisplayName
protected String	opName
protected PrimitiveObjectInspector	resultOI
protected ShortWritable	shortWritable

Constructor Summary

GenericUDFBaseUnary()

Method Summary

String	getDisplayString(String[] children) Get the String to be displayed in explain.
ObjectInspector	initialize(ObjectInspector[] arguments) Initialize this GenericUDF.

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

close, configure, copyToNewInstance, evaluate, flip, getRequiredFiles, getRequiredJars, getUdfName, initializeAndFoldConstants

Methods inherited from class java.lang.Object

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

Field Detail

opName

protected String opName

opDisplayName

protected String opDisplayName

resultOI

protected transient PrimitiveObjectInspector resultOI

converter

protected transient ObjectInspectorConverters.Converter converter

byteWritable

protected ByteWritable byteWritable

shortWritable

protected ShortWritable shortWritable

intWritable

protected org.apache.hadoop.io.IntWritable intWritable

longWritable

protected org.apache.hadoop.io.LongWritable longWritable

floatWritable

protected org.apache.hadoop.io.FloatWritable floatWritable

doubleWritable

protected DoubleWritable doubleWritable

decimalWritable

protected HiveDecimalWritable decimalWritable

Constructor Detail

GenericUDFBaseUnary

public GenericUDFBaseUnary()

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.

getDisplayString

public String getDisplayString(String[] children)

Description copied from class: GenericUDF

Get the String to be displayed in explain.

Specified by:

getDisplayString in class GenericUDF