Package org.apache.hadoop.hive.ql.optimizer.correlation

Class Summary

Class	Description
CorrelationOptimizer	Implementation of Correlation Optimizer.
CorrelationUtilities	Utilities for both CorrelationOptimizer and ReduceSinkDeDuplication.
IntraQueryCorrelation	IntraQueryCorrelation records a sub-tree of the query plan tree which can be evaluated in a single MR job.
QueryPlanTreeTransformation	QueryPlanTreeTransformation contains static methods used to transform the query plan tree (operator tree) based on the correlation we have detected by Correlation Optimizer.
ReduceSinkDeDuplication	If two reducer sink operators share the same partition/sort columns and order, they can be merged.
ReduceSinkDeDuplication.AbsctractReducerReducerProc
ReduceSinkDeDuplicationUtils
ReduceSinkJoinDeDuplication	Optimization to check whether any ReduceSink operator in the plan can be simplified so data is not shuffled/sorted if it is already shuffled/sorted.