org.apache.pig.scripting.jruby
Class JrubyAlgebraicEvalFunc.BagJrubyAlgebraicEvalFunc

java.lang.Object
  org.apache.pig.EvalFunc<T>
      org.apache.pig.AccumulatorEvalFunc<T>
          org.apache.pig.AlgebraicEvalFunc<T>
              org.apache.pig.scripting.jruby.JrubyAlgebraicEvalFunc<DataBag>
                  org.apache.pig.scripting.jruby.JrubyAlgebraicEvalFunc.BagJrubyAlgebraicEvalFunc

All Implemented Interfaces:

Accumulator<DataBag>, Algebraic

Enclosing class:

JrubyAlgebraicEvalFunc<T>

public static class JrubyAlgebraicEvalFunc.BagJrubyAlgebraicEvalFunc
extends JrubyAlgebraicEvalFunc<DataBag>

Unlike EvalFuncs and Accumulators, the type must be known at compile time (ie it can't return Object), as Pig inspects the type and ensures that it is valid. This is why class specific shells are provided here. This is also the reason why the Ruby Algebraic interface is the only interface that does not currently allow overriding outputSchema, and a fixed one must be provided.

Nested Class Summary

static class

JrubyAlgebraicEvalFunc.BagJrubyAlgebraicEvalFunc.Final

Nested classes/interfaces inherited from class org.apache.pig.scripting.jruby.JrubyAlgebraicEvalFunc

JrubyAlgebraicEvalFunc.AlgebraicFunctionWrapper<T>, JrubyAlgebraicEvalFunc.BagJrubyAlgebraicEvalFunc, JrubyAlgebraicEvalFunc.ChararrayJrubyAlgebraicEvalFunc, JrubyAlgebraicEvalFunc.DataByteArrayJrubyAlgebraicEvalFunc, JrubyAlgebraicEvalFunc.DoubleJrubyAlgebraicEvalFunc, JrubyAlgebraicEvalFunc.FloatJrubyAlgebraicEvalFunc, JrubyAlgebraicEvalFunc.Initial, JrubyAlgebraicEvalFunc.IntegerJrubyAlgebraicEvalFunc, JrubyAlgebraicEvalFunc.Intermed, JrubyAlgebraicEvalFunc.LongJrubyAlgebraicEvalFunc, JrubyAlgebraicEvalFunc.MapJrubyAlgebraicEvalFunc, JrubyAlgebraicEvalFunc.TupleJrubyAlgebraicEvalFunc

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

EvalFunc.SchemaType

Field Summary

Fields inherited from class org.apache.pig.scripting.jruby.JrubyAlgebraicEvalFunc

mBagFactory, mTupleFactory, ruby, rubyEngine

Fields inherited from class org.apache.pig.EvalFunc

log, pigLogger, reporter, returnType

Constructor Summary

JrubyAlgebraicEvalFunc.BagJrubyAlgebraicEvalFunc(String fileName, String functionName)

Method Summary

String

getFinal() This must be implement as per a normal Algebraic interface.

Methods inherited from class org.apache.pig.scripting.jruby.JrubyAlgebraicEvalFunc

getInitial, getIntermed

Methods inherited from class org.apache.pig.AlgebraicEvalFunc

accumulate, cleanup, getValue

Methods inherited from class org.apache.pig.AccumulatorEvalFunc

exec

Methods inherited from class org.apache.pig.EvalFunc

finish, getArgToFuncMapping, getCacheFiles, getInputSchema, getLogger, getPigLogger, getReporter, getReturnType, getSchemaName, getSchemaType, isAsynchronous, outputSchema, 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

JrubyAlgebraicEvalFunc.BagJrubyAlgebraicEvalFunc

public JrubyAlgebraicEvalFunc.BagJrubyAlgebraicEvalFunc(String fileName,
                                                        String functionName)

Method Detail

getFinal

public String getFinal()

Description copied from class: AlgebraicEvalFunc

This must be implement as per a normal Algebraic interface. See Algebraic for more information.

Specified by:

getFinal in interface Algebraic

Specified by:

getFinal in class JrubyAlgebraicEvalFunc<DataBag>

Returns:

A function name of f_final. f_final should be an eval func parametrized by the same datum as the eval func implementing this interface.