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Package org.apache.pig.impl.logicalLayer.optimizer

Removed Classes
StreamOptimizer A visitor to optimize in the following scenario with streaming: Optimize when LOAD precedes STREAM and the loader class is the same as the serializer for the STREAM.
 

Added Classes
PartitionFilterOptimizer When the load statement in a pig script is loading a table from a meta data system (like owl) the load can be followed by a filter which can contain conditions on partition columns.
PruneColumns  
PushDownForeachFlatten A visitor to discover if a foreach with flatten(s) can be pushed as low down the tree as possible.
PushUpFilter A visitor to discover if a filter can be pushed as high up the tree as possible.
 

Changed Classes
LogicalOptimizer An optimizer for logical plans.
LogicalTransformer  
SchemaCalculator A visitor to reset all the schemas in a logical plan.
SchemaRemover A visitor to reset all the schemas in a logical plan.