org.apache.pig.scripting.groovy
Class GroovyAlgebraicEvalFunc.DataBagGroovyAlgebraicEvalFunc

java.lang.Object
  org.apache.pig.EvalFunc<T>
      org.apache.pig.AccumulatorEvalFunc<T>
          org.apache.pig.AlgebraicEvalFunc<T>
              org.apache.pig.scripting.groovy.GroovyAlgebraicEvalFunc<DataBag>
                  org.apache.pig.scripting.groovy.GroovyAlgebraicEvalFunc.DataBagGroovyAlgebraicEvalFunc

All Implemented Interfaces:

Accumulator<DataBag>, Algebraic

Enclosing class:

GroovyAlgebraicEvalFunc<T>

public static class GroovyAlgebraicEvalFunc.DataBagGroovyAlgebraicEvalFunc
extends GroovyAlgebraicEvalFunc<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.

Nested Class Summary

static class

GroovyAlgebraicEvalFunc.DataBagGroovyAlgebraicEvalFunc.Final

Nested classes/interfaces inherited from class org.apache.pig.scripting.groovy.GroovyAlgebraicEvalFunc

GroovyAlgebraicEvalFunc.AlgebraicFunctionWrapper<T>, GroovyAlgebraicEvalFunc.BigDecimalGroovyAlgebraicEvalFunc, GroovyAlgebraicEvalFunc.BigIntegerGroovyAlgebraicEvalFunc, GroovyAlgebraicEvalFunc.BooleanGroovyAlgebraicEvalFunc, GroovyAlgebraicEvalFunc.ChararrayGroovyAlgebraicEvalFunc, GroovyAlgebraicEvalFunc.DataBagGroovyAlgebraicEvalFunc, GroovyAlgebraicEvalFunc.DataByteArrayGroovyAlgebraicEvalFunc, GroovyAlgebraicEvalFunc.DateTimeGroovyAlgebraicEvalFunc, GroovyAlgebraicEvalFunc.DoubleGroovyAlgebraicEvalFunc, GroovyAlgebraicEvalFunc.FloatGroovyAlgebraicEvalFunc, GroovyAlgebraicEvalFunc.Initial, GroovyAlgebraicEvalFunc.IntegerGroovyAlgebraicEvalFunc, GroovyAlgebraicEvalFunc.Intermed, GroovyAlgebraicEvalFunc.LongGroovyAlgebraicEvalFunc, GroovyAlgebraicEvalFunc.MapGroovyAlgebraicEvalFunc, GroovyAlgebraicEvalFunc.TupleGroovyAlgebraicEvalFunc

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

EvalFunc.SchemaType

Field Summary

Fields inherited from class org.apache.pig.EvalFunc

log, pigLogger, reporter, returnType

Constructor Summary

GroovyAlgebraicEvalFunc.DataBagGroovyAlgebraicEvalFunc(String path, String namespace, String methodName, String initialMethod, String intermedMethod, String finalMethod)

Method Summary

String

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

Methods inherited from class org.apache.pig.scripting.groovy.GroovyAlgebraicEvalFunc

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

GroovyAlgebraicEvalFunc.DataBagGroovyAlgebraicEvalFunc

public GroovyAlgebraicEvalFunc.DataBagGroovyAlgebraicEvalFunc(String path,
                                                              String namespace,
                                                              String methodName,
                                                              String initialMethod,
                                                              String intermedMethod,
                                                              String finalMethod)
                                                       throws IOException

Throws:

IOException

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 GroovyAlgebraicEvalFunc<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.