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

java.lang.Object
  extended by org.apache.hadoop.hive.ql.udf.generic.GenericUDF
      extended by org.apache.hadoop.hive.ql.udf.generic.GenericUDFTestGetJavaBoolean

public class GenericUDFTestGetJavaBoolean
extends GenericUDF

A test GenericUDF to return native Java's boolean type


Nested Class Summary
 
Nested classes/interfaces inherited from class org.apache.hadoop.hive.ql.udf.generic.GenericUDF
GenericUDF.DeferredObject
 
Constructor Summary
GenericUDFTestGetJavaBoolean()
           
 
Method Summary
 Object evaluate(GenericUDF.DeferredObject[] arguments)
          Evaluate the GenericUDF with the arguments.
 String getDisplayString(String[] children)
          Get the String to be displayed in explain.
 ObjectInspector initialize(ObjectInspector[] arguments)
          Initialize this GenericUDF.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

GenericUDFTestGetJavaBoolean

public GenericUDFTestGetJavaBoolean()
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.

evaluate

public 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

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


Copyright © 2011 The Apache Software Foundation