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Package org.apache.pig

Removed Classes and Interfaces
ReversibleLoadStoreFunc This interface is used to implement classes that can perform both Load and Store functionalities in a symmetric fashion (thus reversible).
Slice A grouping of data on that can be processed individually by Pig.
Slicer Produces independent slices of data from a given location to be processed in parallel by Pig.
StoreConfig A Class which will encapsulate metadata information that a OutputFormat (or possibly StoreFunc) may want to know about the data that needs to be stored.
 

Added Classes and Interfaces
Accumulator  
CollectableLoadFunc This interface implemented by 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.
Expression A class to communicate Filter expressions to LoadFuncs
Expression.BinaryExpression  
Expression.Column  
Expression.Const  
Expression.OpType  
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 can be used to represent a relative position in a file.
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  
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.
LoadPushDown.OperatorSet Set of possible operations that Pig can push down to a loader.
LoadPushDown.RequiredField  
LoadPushDown.RequiredFieldList  
LoadPushDown.RequiredFieldResponse  
OrderedLoadFunc Implementing this interface indicates to Pig that a given loader can be used for MergeJoin.
PigCounters The following enum will contain the general counters that pig uses.
PigServer.SortInfoSetter  
PigToStream The interface used for the custom mapping of a Tuple to a byte array.
ResourceSchema  
ResourceSchema.Order  
ResourceSchema.ResourceFieldSchema  
ResourceStatistics  
ResourceStatistics.ResourceFieldStatistics  
SortColInfo A class representing information about a sort column in SortInfo
SortColInfo.Order  
SortInfo Class to communicate sort column information based on order by statment's sort columns and schema
StoreFuncInterface This interface is used to implement functions to write records from a dataset.
StoreMetadata This interface defines how to write metadata related to data to be loaded.
StreamToPig The interface used for the custom mapping of a byte array received from the stdout of the streaming process to a Tuple This interface together with PigToStream is designed to provide a common protocol for data exchange between Pig runtime and streaming executables.
 

Changed Classes
FuncSpec Class to represent a UDF specification - essentially encapsulates the class name and the arguments to the constructor
LoadFunc LoadFunc provides functions directly associated with reading records from data set.
PigServer This class is the program's connection to Pig.
PigWarning An enum to enumerate the warning types in Pig
StoreFunc This abstract class is used to implement functions to write records from a dataset.