datafu.pig.sets

Class SetUnion

java.lang.Object

org.apache.pig.EvalFunc<org.apache.pig.data.DataBag>

datafu.pig.sets.SetOperationsBase

datafu.pig.sets.SetUnion

public class SetUnion
extends SetOperationsBase

Computes the set union of two or more bags. Duplicates are eliminated.

Example:

 define SetUnion datafu.pig.sets.SetUnion();
 
 -- input:
 -- ({(2,20),(3,30),(4,40)},{(1,10),(2,20),(4,40),(8,80)})
 input = LOAD 'input' AS (B1:bag{T:tuple(val1:int,val2:int)},B2:bag{T:tuple(val1:int,val2:int)});
 
 -- output:
 -- ({(2,20),(3,30),(4,40),(1,10),(8,80)})
 output = FOREACH input GENERATE SetUnion(B1,B2);
 
 

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.pig.EvalFunc

org.apache.pig.EvalFunc.SchemaType

Field Summary

Fields inherited from class org.apache.pig.EvalFunc

log, pigLogger, reporter, returnType

Constructor Summary

Constructors

Constructor and Description
SetUnion()

Method Summary

Methods

Modifier and Type	Method and Description
org.apache.pig.data.DataBag	exec(org.apache.pig.data.Tuple input)

Methods inherited from class datafu.pig.sets.SetOperationsBase

outputSchema

Methods inherited from class org.apache.pig.EvalFunc

allowCompileTimeCalculation, finish, getArgToFuncMapping, getCacheFiles, getInputSchema, getLogger, getPigLogger, getReporter, getReturnType, getSchemaName, getSchemaType, getShipFiles, 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

SetUnion

public SetUnion()

Method Detail

exec

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

Specified by:

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

Throws:

java.io.IOException