com.bigdata.rdf.sparql.ast

Interface NamedSubqueryRoot.Annotations

All Superinterfaces:

INamedSolutionSet.Annotations

Enclosing class:

NamedSubqueryRoot

public static interface NamedSubqueryRoot.Annotations
extends INamedSolutionSet.Annotations

Field Summary

Fields

Modifier and Type	Field and Description
static String	DEPENDS_ON The String[] of the named solution sets on which this named subquery has a dependency.
static String	DONE_SET The set of variables which are known to have been materialized once this named subquery is evaluated.
static String	JOIN_VARS A VarNode[] specifying the join variables that will be used when the named result set is join with the query.

Fields inherited from interface com.bigdata.rdf.sparql.ast.INamedSolutionSet.Annotations

NAMED_SET

Field Detail

DEPENDS_ON

static final String DEPENDS_ON

The String[] of the named solution sets on which this named subquery has a dependency. This is computed by the ASTNamedSubqueryOptimizer.

See Also:

Constant Field Values

JOIN_VARS

static final String JOIN_VARS

A VarNode[] specifying the join variables that will be used when the named result set is join with the query. The join variables MUST be bound for a solution to join.

Note: This can be different for each context in the query in which a given named result set is included. When there are different join variables for different INCLUDEs, then we need to build a hash index for each set of join variable context that will be consumed within the query.

Note: If no join variables are specified, then the join will consider the N x M cross product, filtering for solutions which join. This is very expensive. Whenever possible you should identify one or more variables which must be bound for the join and specify those as the join variables.

See Also:

Constant Field Values

DONE_SET

static final String DONE_SET

The set of variables which are known to have been materialized once this named subquery is evaluated. This is set when the NamedSubqueryRoot is evaluated and then referenced by the NamedSubqueryInclude.

See Also:

Constant Field Values