com.bigdata.rdf.sparql.ast

Interface IQueryNode.Annotations

All Known Subinterfaces:

AbstractOptimizerTestCase.Annotations, ArbitraryLengthPathNode.Annotations, ConstructNode.Annotations, CreateGraph.Annotations, DropGraph.Annotations, GraphPatternGroup.Annotations, GroupMemberNodeBase.Annotations, com.bigdata.rdf.sparql.ast.GroupNodeBase.Annotations, LoadGraph.Annotations, PropertyPathNode.Annotations, StatementPatternNode.Annotations, com.bigdata.rdf.sparql.ast.Update.Annotations

Enclosing interface:

IQueryNode

public static interface IQueryNode.Annotations

Field Summary

Fields

Modifier and Type	Field and Description
static String	QUERY_HINTS An optional Properties object specifying query hints which apply to this AST node.

Field Detail

QUERY_HINTS

static final String QUERY_HINTS

An optional Properties object specifying query hints which apply to this AST node.

The relationship between SPARQL level query hints, the annotations on the ASTBase and PipelineOp nodes is a bit complex, and this Properties object is a bit complex. Briefly, this Properties object contains property values which will be applied (copied) onto generated PipelineOps while annotations on the ASTBase nodes are interpreted by IASTOptimizer s and AST2BOpUtility. SPARQL level query hints map into one or another of these things, or may directly set attributes on the AST2BOpContext.

See Also:

ASTQueryHintOptimizer, Constant Field Values