@jahed/sparql-engine/dist/engine/stages/union-stage-builder.js

SPARQL query engine for servers and web browsers.

// SPDX-License-Identifier: MIT
import StageBuilder from "./stage-builder.js";
import { Pipeline } from "../../engine/pipeline/pipeline.js";
import ExecutionContext from "../context/execution-context.js";
/**
 * A UnionStageBuilder evaluates UNION clauses
 */
export default class UnionStageBuilder extends StageBuilder {
    async execute(source, node, context) {
        const results = [];
        for (const patternToken of node.patterns) {
            results.push(await this.builder._buildGroup(source, patternToken, context));
        }
        return Pipeline.getInstance().merge(...results);
    }
}
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