Package com.hp.hpl.jena.sparql.algebra.optimize

Interface Summary

Optimize.RewriterFactory
Rewrite

Class Summary

ExprTransformApplyTransform	A copying transform that applies an Op Transform to the algebra operator of E_Exist and E_NoExists
ExprTransformConstantFold	An expression transform that simplifies expressions by constant folding wherever possible
ExprVisitorApplyVisitor	An expr visitor that applies a OpVisitor to the algebra operator of E_Exist and E_NoExists
Optimize
OpVisitorExprPrepare
TransformDistinctToReduced	Transforms generic DISTINCT plus ORDER BY combinations to REDUCED plus ORDER BY which typically gives better performance and memory consumption because engines have to keep less data in-memory to evaluate it.
TransformExpandOneOf
TransformExtendCombine	An optimizer that aims to combine multiple extend clauses together.
TransformFilterConjunction	Redo FILTER (A&&B) as FILTER(A) FILTER(B) (as an expr list).
TransformFilterDisjunction	Filter disjunction.
TransformFilterEquality	A transform that aims to optimize queries where there is an equality constraint on a variable to speed up evaluation e.g
TransformFilterImplicitJoin	Optimizer for transforming implicit joins.
TransformFilterInequality	A transform that aims to optimize queries where there is an inequality constraint on a variable in an attempt to speed up evaluation e.g
TransformFilterPlacement	Rewrite an algebra expression to put filters as close to their bound variables.
TransformFilterPlacementConservative	Rewrite an algebra expression to put filters as close to their bound variables in a BGP.
TransformImplicitLeftJoin	Optimizer for transforming implicit joins.
TransformJoinStrategy	Choose join strategy
TransformMergeBGPs	Merge adjacent BGPsTransformCollapseBGPs
TransformOrderByDistinctApplication	Improved optimization for ORDER BY plus DISTINCT or REDUCED combinations, see JENA-441 for original proposal and discussion.
TransformPathFlattern	Perform the equivalent of the trasnactions in the SPARQL 1.1 spec.
TransformPathFlatternStd	The path transformation step exactly as per the SPARQL 1.1 spec.
TransformPattern2Join	Expand to joins of triples and quads.
TransformPromoteTableEmpty	Optimizer that ensures that table empty is promoted as high up a query as is possible
TransformPropertyFunction	Rewrite to replace a property function property with the call to the property function implementation
TransformRemoveLabels
TransformReorder	A Transformer that applies a reordering to all BGPs and Quad Patterns present in the algebra
TransformScopeRename	Rename variables so that names can be treated globally.
TransformSimplify
TransformTopN	Optimization that changes queries that uses OFFSET/LIMIT and ORDER BY to execute using Top N: i.e.