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

Class Summary
ImplicitSplitInserter  
LogicalOptimizer An optimizer for logical plans.
LogicalTransformer  
OpLimitOptimizer A visitor to discover if any schema has been specified for a file being loaded.
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.
SchemaCalculator A visitor to reset all the schemas in a logical plan.
SchemaRemover A visitor to reset all the schemas in a logical plan.
TypeCastInserter A visitor to discover if any schema has been specified for a file being loaded.
 



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