Uses of Interface
org.apache.pig.Accumulator

Packages that use Accumulator

Package	Description
org.apache.pig	Public interfaces and classes for Pig.
org.apache.pig.builtin	This package contains builtin Pig UDFs.
org.apache.pig.piggybank.evaluation
org.apache.pig.scripting.groovy
org.apache.pig.scripting.jruby

Uses of Accumulator in org.apache.pig

Subinterfaces of Accumulator in org.apache.pig

Modifier and Type	Interface and Description
interface	TerminatingAccumulator<T> This is an interface which, if implemented, allows an Accumulator function to signal that it can terminate early.

Classes in org.apache.pig that implement Accumulator

Modifier and Type	Class and Description
class	AccumulatorEvalFunc<T> This class is used to provide a free implementation of the EvalFunc exec function given implementation of the Accumulator interface.
class	AlgebraicEvalFunc<T> This class is used to provide a free implementation of the Accumulator interface and EvalFunc class in the case of an Algebraic function.
class	IteratingAccumulatorEvalFunc<T> This class provides a much more intuitive way to write Accumulator UDFs. For example, you could express IsEmpty as follows:

Uses of Accumulator in org.apache.pig.builtin

Classes in org.apache.pig.builtin that implement Accumulator

Modifier and Type	Class and Description
class	AlgebraicBigDecimalMathBase Core logic for applying an SUM function to a bag of BigDecimals.
class	AlgebraicBigIntegerMathBase Core logic for applying an SUM function to a bag of BigIntegers.
class	AlgebraicByteArrayMathBase Core logic for applying an accumulative/algebraic math function to a bag of doubles.
class	AlgebraicDoubleMathBase Core logic for applying an accumulative/algebraic math function to a bag of doubles.
class	AlgebraicFloatMathBase Core logic for applying an accumulative/algebraic math function to a bag of Floats.
class	AlgebraicIntMathBase Core logic for applying an accumulative/algebraic math function to a bag of doubles.
class	AlgebraicLongMathBase Core logic for applying an accumulative/algebraic math function to a bag of Longs.
class	AVG Generates the average of a set of values.
class	BigDecimalAvg This method should never be used directly, use AVG.
class	BigDecimalMax This method should never be used directly, use MAX.
class	BigDecimalMin This method should never be used directly, use MIN.
class	BigDecimalSum This method should never be used directly, use SUM.
class	BigIntegerAvg This method should never be used directly, use AVG.
class	BigIntegerMax This method should never be used directly, use MAX.
class	BigIntegerMin This method should never be used directly, use MIN.
class	BigIntegerSum This method should never be used directly, use SUM.
class	COUNT Generates the count of the number of values in a bag.
class	COUNT_STAR Generates the count of the values of the first field of a tuple.
class	DateTimeMax This method should never be used directly, use MAX.
class	DateTimeMin This method should never be used directly, use MAX.
class	DoubleAvg This method should never be used directly, use AVG.
class	DoubleMax This method should never be used directly, use MAX.
class	DoubleMin This method should never be used directly, use MIN.
class	DoubleSum This method should never be used directly, use SUM.
class	FloatAvg This method should never be used directly, use AVG.
class	FloatMax This method should never be used directly, use MAX.
class	FloatMin This method should never be used directly, use MIN.
class	FloatSum This method should never be used directly, use SUM.
class	IntAvg This method should never be used directly, use AVG.
class	IntMax This method should never be used directly, use MAX.
class	IntMin This method should never be used directly, use MIN.
class	IntSum This method should never be used directly, use SUM.
class	LongAvg This method should never be used directly, use AVG.
class	LongMax This method should never be used directly, use MAX.
class	LongMin This method should never be used directly, use MIN.
class	LongSum This method should never be used directly, use SUM.
class	MAX Generates the maximum of a set of values.
class	MIN Generates the minimum of a set of values.
class	StringMax This method should never be used directly, use MAX.
class	StringMin This method should never be used directly, use MIN.
class	SUM Generates the sum of a set of values.
class	TOP Top UDF accepts a bag of tuples and returns top-n tuples depending upon the tuple field value of type long.

Uses of Accumulator in org.apache.pig.piggybank.evaluation

Classes in org.apache.pig.piggybank.evaluation that implement Accumulator

Modifier and Type	Class and Description
class	ExtremalTupleByNthField This class is similar to MaxTupleBy1stField except that it allows you to specify with field to use (instead of just using 1st field) and to specify ascending or descending.
class	MaxTupleBy1stField MaxTupleBy1stField UDF returns a tuple with max value of the first field in a given bag.

Uses of Accumulator in org.apache.pig.scripting.groovy

Classes in org.apache.pig.scripting.groovy that implement Accumulator

Modifier and Type	Class and Description
class	GroovyAccumulatorEvalFunc
class	GroovyAlgebraicEvalFunc<T>
static class	GroovyAlgebraicEvalFunc.BigDecimalGroovyAlgebraicEvalFunc
static class	GroovyAlgebraicEvalFunc.BigIntegerGroovyAlgebraicEvalFunc
static class	GroovyAlgebraicEvalFunc.BooleanGroovyAlgebraicEvalFunc
static class	GroovyAlgebraicEvalFunc.ChararrayGroovyAlgebraicEvalFunc
static class	GroovyAlgebraicEvalFunc.DataBagGroovyAlgebraicEvalFunc 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.
static class	GroovyAlgebraicEvalFunc.DataByteArrayGroovyAlgebraicEvalFunc
static class	GroovyAlgebraicEvalFunc.DateTimeGroovyAlgebraicEvalFunc
static class	GroovyAlgebraicEvalFunc.DoubleGroovyAlgebraicEvalFunc
static class	GroovyAlgebraicEvalFunc.FloatGroovyAlgebraicEvalFunc
static class	GroovyAlgebraicEvalFunc.IntegerGroovyAlgebraicEvalFunc
static class	GroovyAlgebraicEvalFunc.LongGroovyAlgebraicEvalFunc
static class	GroovyAlgebraicEvalFunc.MapGroovyAlgebraicEvalFunc
static class	GroovyAlgebraicEvalFunc.TupleGroovyAlgebraicEvalFunc

Uses of Accumulator in org.apache.pig.scripting.jruby

Classes in org.apache.pig.scripting.jruby that implement Accumulator

Modifier and Type	Class and Description
class	JrubyAccumulatorEvalFunc This class provides a bridge between Ruby classes that extend AccumulatorPigUdf and their execution in Pig.
class	JrubyAlgebraicEvalFunc<T> This class provides the bridge between Ruby classes that extend the AlgebraicPigUdf "interface" by implementing an initial, intermed, and final method.
static class	JrubyAlgebraicEvalFunc.BagJrubyAlgebraicEvalFunc 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.
static class	JrubyAlgebraicEvalFunc.ChararrayJrubyAlgebraicEvalFunc
static class	JrubyAlgebraicEvalFunc.DataByteArrayJrubyAlgebraicEvalFunc
static class	JrubyAlgebraicEvalFunc.DoubleJrubyAlgebraicEvalFunc
static class	JrubyAlgebraicEvalFunc.FloatJrubyAlgebraicEvalFunc
static class	JrubyAlgebraicEvalFunc.IntegerJrubyAlgebraicEvalFunc
static class	JrubyAlgebraicEvalFunc.LongJrubyAlgebraicEvalFunc
static class	JrubyAlgebraicEvalFunc.MapJrubyAlgebraicEvalFunc
static class	JrubyAlgebraicEvalFunc.TupleJrubyAlgebraicEvalFunc