datafu.pig.bags
Class UnorderedPairs

java.lang.Object
  extended by org.apache.pig.EvalFunc<org.apache.pig.data.DataBag>
      extended by datafu.pig.bags.UnorderedPairs

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

Generates pairs of all items in a bag.

Example:

 define UnorderedPairs datafu.pig.bags.UnorderedPairs();
 
 -- input:
 -- ({(1),(2),(3),(4)})
 input = LOAD 'input' AS (B: bag {T: tuple(v:INT)});
 
 -- output:
 -- ({((1),(2)),((1),(3)),((1),(4)),((2),(3)),((2),(4)),((3),(4))})
 output = FOREACH input GENERATE UnorderedPairs(B);
  
 


Field Summary
 
Fields inherited from class org.apache.pig.EvalFunc
log, pigLogger, reporter, returnType
 
Constructor Summary
UnorderedPairs()
           
 
Method Summary
 org.apache.pig.data.DataBag exec(org.apache.pig.data.Tuple input)
           
 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

UnorderedPairs

public UnorderedPairs()
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

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>


Matthew Hayes, Sam Shah