| ExprTransformApplyTransform |
A copying transform that applies an Op Transform to the algebra operator of E_Exist and E_NoExists
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| ExprTransformConstantFold |
An expression transform that simplifies expressions by constant folding
wherever possible
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| ExprVisitorApplyVisitor |
An expr visitor that applies a OpVisitor to the algebra operator of E_Exist and E_NoExists
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| Optimize |
Optimization of algebra expressions.
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| OptimizerMinimal |
The minimal optimizer.
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| OptimizerStd |
The standard optimization sequence.
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| OpVisitorExprPrepare |
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| 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.
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| TransformEliminateAssignments |
A transform that tries to in-line/eliminate assignments
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| TransformExpandOneOf |
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| TransformExtendCombine |
An optimizer that aims to combine multiple extend clauses together.
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| TransformFilterConjunction |
Redo FILTER (A&&B) as FILTER(A) FILTER(B) (as an expr list).
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| TransformFilterDisjunction |
Filter disjunction.
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| TransformFilterEquality |
A transform that aims to optimize queries where there is an equality
constraint on a variable to speed up evaluation e.g
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| TransformFilterImplicitJoin |
Optimizer for transforming implicit joins.
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| 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
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| TransformFilterPlacement |
Rewrite an algebra expression to put filters as close to their bound
variables.
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| TransformFilterPlacement.Placement |
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| TransformFilterPlacementConservative |
Rewrite an algebra expression to put filters as close to their bound
variables in a BGP.
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| TransformImplicitLeftJoin |
Optimizer for transforming implicit joins.
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| TransformJoinStrategy |
Choose join strategy
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| TransformMergeBGPs |
Merge BGPs
(join BGP1 BGP2) => BGP
(sequence ...BGP1 BGP2 ...) => (sequence ...BGP ...)
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| TransformOrderByDistinctApplication |
Improved optimization for ORDER BY plus DISTINCT or
REDUCED combinations, see JENA-441 for original proposal and
discussion.
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| TransformPathFlattern |
Perform the equivalent of the transactions in the SPARQL 1.1 spec.
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| TransformPathFlatternStd |
The path transformation step exactly as per the SPARQL 1.1 spec.
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| TransformPattern2Join |
Expand to joins of triples and quads.
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| TransformPromoteTableEmpty |
Optimizer that ensures that table empty is promoted as high
up a query as is possible
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| TransformPropertyFunction |
Rewrite to replace a property function property with the call to the property function implementation
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| TransformRemoveAssignment |
A transform capable of removing assignments from the algebra tree
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| TransformRemoveLabels |
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| TransformReorder |
A Transformer that applies a reordering to all BGPs and Quad Patterns present in the algebra
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| TransformScopeRename |
Rename variables so that names can be treated globally.
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| TransformSimplify |
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| TransformTopN |
Optimization that changes queries that uses OFFSET/LIMIT and ORDER BY
to execute using Top N: i.e.
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| VariableUsagePopper |
An after visitor for tracking variable usage
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| VariableUsagePusher |
A before visitor for tracking variable usage
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| VariableUsageTracker |
Tracker for variable usage
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| VariableUsageVisitor |
A visitor which tracks variable usage
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