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

java.lang.Object
  org.apache.hadoop.hive.ql.udf.generic.GenericUDTF
      org.apache.hadoop.hive.ql.udf.generic.GenericUDTFStack

public class GenericUDTFStack
extends GenericUDTF

Takes a row of size k of data and splits it into n rows of data. For example, if n is 3 then the rest of the arguments are split in order into 3 rows, each of which has k/3 columns in it (the first emitted row has the first k/3, the second has the second, etc). If n does not divide k then the remaining columns are padded with NULLs.

Constructor Summary

GenericUDTFStack()

Method Summary

void	close() Called to notify the UDTF that there are no more rows to process.
StructObjectInspector	initialize(ObjectInspector[] args) Initialize this GenericUDTF.
void	process(Object[] args) Give a set of arguments for the UDTF to process.
String	toString()

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

configure, initialize, setCollector

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

GenericUDTFStack

public GenericUDTFStack()

Method Detail

close

public void close()
           throws HiveException

Description copied from class: GenericUDTF

Called to notify the UDTF that there are no more rows to process. Clean up code or additional forward() calls can be made here.

Specified by:

close in class GenericUDTF

Throws:

HiveException

initialize

public StructObjectInspector initialize(ObjectInspector[] args)
                                 throws UDFArgumentException

Description copied from class: GenericUDTF

Initialize this GenericUDTF. This will be called only once per instance.

Overrides:

initialize in class GenericUDTF

Parameters:

args - An array of ObjectInspectors for the arguments

Returns:

A StructObjectInspector for output. The output struct represents a row of the table where the fields of the stuct are the columns. The field names are unimportant as they will be overridden by user supplied column aliases.

Throws:

UDFArgumentException

process

public void process(Object[] args)
             throws HiveException,
                    UDFArgumentException

Description copied from class: GenericUDTF

Give a set of arguments for the UDTF to process.

Specified by:

process in class GenericUDTF

Parameters:

args - object array of arguments

Throws:

HiveException

UDFArgumentException

toString

public String toString()

Overrides:

toString in class Object