c# - 使用 IList.Contains(partition) 进行具有多个分区的 DocumentDb 查询

Question

如果查询筛选器使用 IList Contains 方法而不是显式对分区进行 OR 运算，Azure DocumentDB 能否跨分区并行查询？

例如

DocumentClient client = ...
Uri documentUri = ...
FeedOptions = new FeedOptions { EnableCrossPartitionQuery = true };

IList<string> partitions = new List<string> { "x", "y", "z" };
Expression<Func<ResourceType, bool>> filter =
    (ResourceType rt) => partitions.Contains(rt.PartitionId);

IDocumentQuery<ResourceType> queryable =
    client.CreateDocumentQuery<ResourceType>(documentUri, feedOptions)
          .Where(filter)
          .AsDocumentQuery();
FeedResponse<ResourceType> response = await queryable.ExecuteNextAsync<ResourceType>();

Answer 1

是的，包含查询(翻译为 SQL IN)将被批量/并行化到匹配的分区。就像@fred-han提到的，请设置FeedOptions.MaxDegreeOfParallelism .