@jahed/sparql-engine/dist/operators/exists.d.ts

SPARQL query engine for servers and web browsers.

import ExecutionContext from "../engine/context/execution-context.ts";
import type { PipelineStage } from "../engine/pipeline/pipeline-engine.ts";
import { PlanBuilder } from "../engine/plan-builder.ts";
import { Bindings } from "../rdf/bindings.ts";
/**
 * Evaluates a SPARQL FILTER (NOT) EXISTS clause
 * TODO this function could be simplified using a filterMap like operator, we should check if Rxjs offers that filterMap
 * @param source    - Source {@link PipelineStage}
 * @param groups    - Content of the FILTER clause
 * @param builder   - Plan builder used to evaluate subqueries
 * @param notexists - True if the filter is NOT EXISTS, False otherwise
 * @param context   - Execution context
 * @return A {@link PipelineStage} which evaluate the FILTER (NOT) EXISTS operation
 */
export default function exists(source: PipelineStage<Bindings>, groups: any[], builder: PlanBuilder, notexists: boolean, context: ExecutionContext): PipelineStage<Bindings>;