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

Class GenericUDFConcatWS

java.lang.Object

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

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

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

public class GenericUDFConcatWS
extends GenericUDF

Generic UDF for string function CONCAT_WS(sep, [string | array(string)]+). This mimics the function from MySQL http://dev.mysql.com/doc/refman/5.0/en/string-functions.html# function_concat-ws

See Also:

GenericUDF

Nested Class Summary

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

GenericUDF.DeferredJavaObject, GenericUDF.DeferredObject

Constructor Summary

Constructors

Constructor and Description
GenericUDFConcatWS()

Method Summary

Modifier and Type	Method and Description
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 boolean	isStringOrVoidType(ObjectInspector oi)

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

Constructor Detail

GenericUDFConcatWS

public GenericUDFConcatWS()

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.

isStringOrVoidType

protected boolean isStringOrVoidType(ObjectInspector oi)

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

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