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Package org.apache.pig.impl.builtin

Added Classes
DefaultIndexableLoader Used by MergeJoin .
GetMemNumRows UDF to get memory size of a tuple and extracts number of rows value from special tuple created by PoissonSampleLoader It is used by skewed join.
PartitionSkewedKeys Partition reducers for skewed keys.
PoissonSampleLoader See "Skewed Join sampler" in http://wiki.apache.org/pig/PigSampler
SampleLoader Abstract class that specifies the interface for sample loaders
 

Changed Classes
GFCross  
RandomSampleLoader A loader that samples the data.