使用IList.Contains（分區）對多個分區進行DocumentDb查詢

Question

如果查詢過濾器使用IList Contains方法而不是明確地對分區進行OR操作，Azure DocumentDB可以並行處理跨分區的查詢嗎？

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，包含查詢（轉換爲SQL IN）將被分批/並行到匹配的分區。像@ fred-han提到的，請設置FeedOptions.MaxDegreeOfParallelism。