datafu.pig.bags
Class EmptyBagToNull

java.lang.Object
  org.apache.pig.EvalFunc<org.apache.pig.data.DataBag>
      datafu.pig.bags.EmptyBagToNull

public class EmptyBagToNull
extends org.apache.pig.EvalFunc<org.apache.pig.data.DataBag>

Returns null if the input is an empty bag; otherwise, returns the input bag unchanged.

Field Summary

Fields inherited from class org.apache.pig.EvalFunc

log, pigLogger, reporter, returnType

Constructor Summary

EmptyBagToNull()

Method Summary

org.apache.pig.data.DataBag	exec(org.apache.pig.data.Tuple tuple)
org.apache.pig.impl.logicalLayer.schema.Schema	outputSchema(org.apache.pig.impl.logicalLayer.schema.Schema input)

Methods inherited from class org.apache.pig.EvalFunc

finish, getArgToFuncMapping, getCacheFiles, getInputSchema, getLogger, getPigLogger, getReporter, getReturnType, getSchemaName, isAsynchronous, progress, setInputSchema, setPigLogger, setReporter, setUDFContextSignature, warn

Methods inherited from class java.lang.Object

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

Constructor Detail

EmptyBagToNull

public EmptyBagToNull()

Method Detail

exec

public org.apache.pig.data.DataBag exec(org.apache.pig.data.Tuple tuple)
                                 throws java.io.IOException

Specified by:

exec in class org.apache.pig.EvalFunc<org.apache.pig.data.DataBag>

Throws:

java.io.IOException

outputSchema

public org.apache.pig.impl.logicalLayer.schema.Schema outputSchema(org.apache.pig.impl.logicalLayer.schema.Schema input)

Overrides:

outputSchema in class org.apache.pig.EvalFunc<org.apache.pig.data.DataBag>