Package org.apache.pig

Public interfaces and classes for Pig.

See:
Description

Interface Summary

Accumulator<T>	An interface that allows UDFs that take a bag to accumulate tuples in chunks rather than take the whole set at once.
Algebraic	An interface to declare that an EvalFunc's calculation can be decomposed into intitial, intermediate, and final steps.
CollectableLoadFunc	This interface implemented by a LoadFunc implementations indicates to Pig that it has the capability to load data such that all instances of a key will occur in same split.
ExceptionalFunction<S,T,E extends Exception>	An interface that captures a unit of work against an item where an exception might be thrown.
ExecType	The type of query execution.
Function<S,T>	A convenience typedef that ties into both google's Function and ExceptionalFunction.
IndexableLoadFunc	This class is intended for use by LoadFunc implementations which have an internal index for sorted data and can use the index to support merge join in Pig.
LoadCaster	An interface that provides cast implementations for load functions.
LoadMetadata	This interface defines how to retrieve metadata related to data to be loaded.
LoadPushDown	This interface defines how to communicate to Pig what functionality can be pushed into the loader.
LoadStoreCaster	This is just a union interface of LoadCaster and StoreCaster, made available for simplicity.
OrderedLoadFunc	Implementing this interface indicates to Pig that a given loader can be used for MergeJoin.
OverwritableStoreFunc	A StoreFunc should implement this interface to enable overwriting its store/output location if it already exists.
PigToStream	Deprecated. Use PigStreamingBase
StoreCaster	An interface that provides methods for converting Pig internal types to byte[].
StoreFuncInterface	StoreFuncs take records from Pig's processing and store them into a data store.
StoreMetadata	This interface defines how to write metadata related to data to be stored.
StreamToPig	Deprecated. Use PigStreamingBase
TerminatingAccumulator<T>	This is an interface which, if implemented, allows an Accumulator function to signal that it can terminate early.

Class Summary

AccumulatorEvalFunc<T>	This class is used to provide a free implementation of the EvalFunc exec function given implementation of the Accumulator interface.
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.
ComparisonFunc	Deprecated.
EvalFunc<T>	The class is used to implement functions to be applied to fields in a dataset.
ExecTypeProvider
Expression	A class to communicate Filter expressions to LoadFuncs.
Expression.BinaryExpression
Expression.Column
Expression.Const
FileInputLoadFunc	This class provides an implementation of OrderedLoadFunc interface which can be optionally re-used by LoadFuncs that use FileInputFormat, by having this as a super class
FileSplitComparable	This class represents a relative position in a file.
FilterFunc
FuncSpec	Class to represent a UDF specification.
IteratingAccumulatorEvalFunc<T>	This class provides a much more intuitive way to write Accumulator UDFs. For example, you could express IsEmpty as follows:
LoadFunc	A LoadFunc loads data into Pig.
LoadFuncMetadataWrapper	Convenience class to extend when decorating a class that extends LoadFunc and implements LoadMetadata.
LoadFuncWrapper	Convenience class to extend when decorating a LoadFunc.
LoadPushDown.RequiredField	Describes a field that is required to execute a scripts.
LoadPushDown.RequiredFieldList	List of fields that Pig knows to be required to executed a script.
LoadPushDown.RequiredFieldResponse	Indicates whether the loader will return the requested fields or all fields.
Main	Main class for Pig engine.
PigConfiguration	Container for static configuration strings, defaults, etc.
PigConstants
PigRunner	A utility to help run PIG scripts within a Java program.
PigRunner.ReturnCode
PigServer	A class for Java programs to connect to Pig.
PigStreamingBase	The interface is used for the custom mapping of - a Tuple to a byte array.
PrimitiveEvalFunc<IN,OUT>	Base class for simple Pig UDFs that are functions of primitive types IN to OUT.
ResourceSchema	A represenation of a schema used to communicate with load and store functions.
ResourceSchema.ResourceFieldSchema
ResourceStatistics	An class that represents statistics about data to be loaded or stored.
ResourceStatistics.ResourceFieldStatistics	Statistics for a given field in the data.
SortColInfo	A class representing information about a sort column in SortInfo
SortInfo	Class to communicate sort column information based on order by statment's sort columns and schema
StoreFunc	StoreFuncs take records from Pig's processing and store them into a data store.
StoreFuncMetadataWrapper	Convenience class to extend when decorating a class that implements both StoreFunc and StoreMetadata.
StoreFuncWrapper	Convenience class to extend when decorating a StoreFunc.
TypedOutputEvalFunc<OUT>	Base class for Pig UDFs that are functions from Tuples to generic type OUT.

Enum Summary

EvalFunc.SchemaType	EvalFunc's schema type.
Expression.OpType
LoadPushDown.OperatorSet	Set of possible operations that Pig can push down to a loader.
PigCounters	The following enum will contain the general counters that pig uses.
PigWarning	An enum to enumerate the warning types in Pig
ResourceSchema.Order
SortColInfo.Order

Exception Summary

PigException

All exceptions in Pig are encapsulated in the PigException class.

Package org.apache.pig Description

Public interfaces and classes for Pig.

PigServer is the interface to Pig for use by other java programs. Other interfaces and classes in this package are for use by users when implementing user defined functions.