Package org.apache.hadoop.hive.ql.ppd

Class Summary

ExprWalkerInfo	Context for Expression Walker for determining predicate pushdown candidates It contains a ExprInfo object for each expression that is processed.
ExprWalkerProcFactory	Expression factory for predicate pushdown processing.
ExprWalkerProcFactory.ColumnExprProcessor	ColumnExprProcessor.
ExprWalkerProcFactory.DefaultExprProcessor	For constants and null expressions.
ExprWalkerProcFactory.FieldExprProcessor	FieldExprProcessor.
ExprWalkerProcFactory.GenericFuncExprProcessor	If all children are candidates and refer only to one table alias then this expr is a candidate else it is not a candidate but its children could be final candidates.
OpProcFactory	Operator factory for predicate pushdown processing of operator graph Each operator determines the pushdown predicates by walking the expression tree.
OpProcFactory.DefaultPPD	Default processor which just merges its children.
OpProcFactory.FilterPPD	Determines the push down predicates in its where expression and then combines it with the push down predicates that are passed from its children.
OpProcFactory.JoinerPPD	Determines predicates for which alias can be pushed to it's parents.
OpProcFactory.JoinPPD
OpProcFactory.LateralViewForwardPPD
OpProcFactory.ScriptPPD	Processor for Script Operator Prevents any predicates being pushed.
OpProcFactory.TableScanPPD	Combines predicates of its child into a single expression and adds a filter op as new child.
OpProcFactory.UDTFPPD
OpWalkerInfo	Context class for operator walker of predicate pushdown.
PredicatePushDown	Implements predicate pushdown.
PredicateTransitivePropagate	propagates filters to other aliases based on join condition