org.apache.pig.builtin
Class TOTUPLE

java.lang.Object
  extended by org.apache.pig.EvalFunc<Tuple>
      extended by org.apache.pig.builtin.TOTUPLE

public class TOTUPLE
extends EvalFunc<Tuple>

This class makes a tuple out of the parameter T = foreach U generate TOTUPLE($0, $1, $2); It generates a tuple containing $0, $1, and $2


Field Summary
 
Fields inherited from class org.apache.pig.EvalFunc
log, pigLogger, reporter, returnType
 
Constructor Summary
TOTUPLE()
           
 
Method Summary
 Tuple exec(Tuple input)
          This callback method must be implemented by all subclasses.
 Schema outputSchema(Schema input)
          Report the schema of the output of this UDF.
 
Methods inherited from class org.apache.pig.EvalFunc
finish, getArgToFuncMapping, getCacheFiles, getLogger, getPigLogger, getReporter, getReturnType, getSchemaName, isAsynchronous, progress, setPigLogger, setReporter, warn
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

TOTUPLE

public TOTUPLE()
Method Detail

exec

public Tuple exec(Tuple input)
           throws IOException
Description copied from class: EvalFunc
This callback method must be implemented by all subclasses. This is the method that will be invoked on every Tuple of a given dataset. Since the dataset may be divided up in a variety of ways the programmer should not make assumptions about state that is maintained between invocations of this method.

Specified by:
exec in class EvalFunc<Tuple>
Parameters:
input - the Tuple to be processed.
Returns:
result, of type T.
Throws:
IOException

outputSchema

public Schema outputSchema(Schema input)
Description copied from class: EvalFunc
Report the schema of the output of this UDF. Pig will make use of this in error checking, optimization, and planning. The schema of input data to this UDF is provided.

Overrides:
outputSchema in class EvalFunc<Tuple>
Parameters:
input - Schema of the input
Returns:
Schema of the output


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