datafu.pig.bags
Class AppendToBag

java.lang.Object
  org.apache.pig.EvalFunc<T>
      datafu.pig.util.SimpleEvalFunc<org.apache.pig.data.DataBag>
          datafu.pig.bags.AppendToBag

public class AppendToBag
extends SimpleEvalFunc<org.apache.pig.data.DataBag>

Appends a tuple to a bag.

Example:

 define AppendToBag datafu.pig.bags.AppendToBag();
 
 -- input:
 -- ({(1),(2),(3)},(4))
 -- ({(10),(20),(30),(40),(50)},(60))
 input = LOAD 'input' AS (B: bag{T: tuple(v:INT)}, T: tuple(v:INT));

 -- output:
 -- ({(1),(2),(3),(4)})
 -- ({(10),(20),(30),(40),(50),(60)})
 output = FOREACH input GENERATE AppendToBag(B,T) as B;
 
 

Field Summary

Fields inherited from class org.apache.pig.EvalFunc

log, pigLogger, reporter, returnType

Constructor Summary

AppendToBag()

Method Summary

org.apache.pig.data.DataBag	call(org.apache.pig.data.DataBag inputBag, org.apache.pig.data.Tuple t)
org.apache.pig.impl.logicalLayer.schema.Schema	outputSchema(org.apache.pig.impl.logicalLayer.schema.Schema input) Override outputSchema so we can verify the input schema at pig compile time, instead of runtime

Methods inherited from class datafu.pig.util.SimpleEvalFunc

exec, getReturnType

Methods inherited from class org.apache.pig.EvalFunc

finish, getArgToFuncMapping, getCacheFiles, getInputSchema, getLogger, getPigLogger, getReporter, 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

AppendToBag

public AppendToBag()

Method Detail

call

public org.apache.pig.data.DataBag call(org.apache.pig.data.DataBag inputBag,
                                        org.apache.pig.data.Tuple t)
                                 throws java.io.IOException

Throws:

java.io.IOException

outputSchema

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

Description copied from class: SimpleEvalFunc

Override outputSchema so we can verify the input schema at pig compile time, instead of runtime

Overrides:

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

Parameters:

input - input schema

Returns:

call to super.outputSchema in case schema was defined elsewhere