com.bigdata.rdf.sparql.ast

Interface SubqueryRoot.Annotations

All Superinterfaces:

IJoinNode.Annotations

Enclosing class:

SubqueryRoot

public static interface SubqueryRoot.Annotations
extends IJoinNode.Annotations

Field Summary

Fields

Modifier and Type	Field and Description
static String	ASK_VAR Annotation used to communicate the name of the anonymous variable supporting a NOT (EXISTS) graph pattern evaluation.
static FilterExistsModeEnum	DEFAULT_FILTER_EXISTS
static boolean	DEFAULT_RUN_ONCE
static String	FILTER_EXISTS Used to specify the query plan for FILTER (NOT) EXISTS.
static String	RUN_ONCE Annotation provides a query hint indicating whether or not the subquery should be transformed into a named subquery, lifting its evaluation out of the main body of the query and replacing the subquery with an INCLUDE.

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

DEFAULT_MINUS, DEFAULT_OPTIONAL, FILTERS, MINUS, OPTIONAL

Field Detail

RUN_ONCE

static final String RUN_ONCE

Annotation provides a query hint indicating whether or not the subquery should be transformed into a named subquery, lifting its evaluation out of the main body of the query and replacing the subquery with an INCLUDE. When true, the subquery will be lifted out. When false, the subquery will not be lifted unless other semantics require that it be lifted out regardless.

See Also:

ASTSparql11SubqueryOptimizer, Constant Field Values

DEFAULT_RUN_ONCE

static final boolean DEFAULT_RUN_ONCE

See Also:

Constant Field Values

ASK_VAR

static final String ASK_VAR

Annotation used to communicate the name of the anonymous variable supporting a NOT (EXISTS) graph pattern evaluation.

See Also:

Constant Field Values

FILTER_EXISTS

static final String FILTER_EXISTS

Used to specify the query plan for FILTER (NOT) EXISTS. There are two basic plans: vectored sub-plan and subquery with LIMIT ONE. Each plan has its advantages.

Note: This annotation is propagated to the SubqueryRoot when the FILTER (NOT) EXISTS for a SubqueryFunctionNodeBase is turned into an ASK subquery.

See Also:

SubqueryFunctionNodeBase, FilterExistsModeEnum, bad performance for FILTER EXISTS , Constant Field Values

DEFAULT_FILTER_EXISTS

static final FilterExistsModeEnum DEFAULT_FILTER_EXISTS