@azure/cosmos/dist/react-native/queryExecutionContext/orderByQueryExecutionContext.js

Microsoft Azure Cosmos DB Service Node.js SDK for NOSQL API

import { OrderByDocumentProducerComparator } from "./orderByDocumentProducerComparator.js";
import { ParallelQueryExecutionContextBase } from "./parallelQueryExecutionContextBase.js";
import { TargetPartitionRangeManager } from "./queryFilteringStrategy/TargetPartitionRangeManager.js";
import { OrderByQueryProcessingStrategy } from "./queryProcessingStrategy/OrderByQueryProcessingStrategy.js";
/** @hidden */
export class OrderByQueryExecutionContext extends ParallelQueryExecutionContextBase {
    /**
     * Provides the OrderByQueryExecutionContext.
     * This class is capable of handling orderby queries and dervives from ParallelQueryExecutionContextBase.
     *
     * When handling a parallelized query, it instantiates one instance of
     * DocumentProcuder per target partition key range and aggregates the result of each.
     *
     * @param clientContext - The service endpoint to use to create the client.
     * @param collectionLink - The Collection Link
     * @param options - Represents the feed options.
     * @param partitionedQueryExecutionInfo - PartitionedQueryExecutionInfo
     * @hidden
     */
    constructor(clientContext, collectionLink, query, options, partitionedQueryExecutionInfo, correlatedActivityId) {
        const rangeManager = TargetPartitionRangeManager.createForOrderByQuery({
            queryInfo: partitionedQueryExecutionInfo,
        });
        // Create ORDER BY query processing strategy with sortOrders
        const processingStrategy = new OrderByQueryProcessingStrategy(partitionedQueryExecutionInfo.queryInfo.orderBy);
        // Create ORDER BY comparator (need to access sortOrders from partitionedQueryExecutionInfo)
        const orderByComparator = new OrderByDocumentProducerComparator(partitionedQueryExecutionInfo.queryInfo.orderBy);
        // Create comparator function for ORDER BY queries
        const comparator = (docProd1, docProd2) => {
            return orderByComparator.compare(docProd1, docProd2);
        };
        // Calling on base class constructor
        super(clientContext, collectionLink, query, options, partitionedQueryExecutionInfo, correlatedActivityId, rangeManager, processingStrategy, comparator);
    }
    /**
     * Fetches next single item from producer for ORDER BY processing.
     */
    async fetchFromProducer(producer) {
        const response = await producer.fetchNextItem();
        if (response && response.result) {
            return {
                result: [response.result],
                headers: response.headers,
            };
        }
        return response;
    }
    /**
     * Determines if buffered producers should continue to be processed for ORDER BY queries.
     * For ORDER BY, only process when no unfilled producers remain to maintain order.
     * @param isUnfilledQueueEmpty - Whether the unfilled queue is empty
     * @hidden
     */
    shouldProcessBufferedProducers(isUnfilledQueueEmpty) {
        // For ORDER BY, only process when no unfilled producers remain to maintain order
        return isUnfilledQueueEmpty;
    }
}
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