Package com.bigdata.rdf.sparql.ast.hints

Query hints are specified at the SPARQL layer using magic predicates.

See: Description

Package com.bigdata.rdf.sparql.ast.hints Description

Query hints are specified at the SPARQL layer using magic predicates. A few special query hints are interpreted by the parser itself (currently only the QueryID). Most query hints are handled by the ASTQueryHintOptimizer.

Query hints wind up being handled in several different ways. Some of them cause query wide attributes to be set on the AST2BOpContext. Other query hints are transferred into ASTBase annotations and then subsequently intepreted either by other IASTOptimizers or by AST2BOpUtility. Finally, some query hints are set on the "queryHints" property of the ASTBase nodes. Those query hints are then transferred onto PipelineOps as they are generated.

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