presto-main/src/main/java/io/prestosql/operator/HttpPageBufferClient.java/HttpPageBufferClient/PagesResponse
class HttpPageBufferClient:        private PagesResponse(String taskInstanceId, long token, long nextToken, Iterable<SerializedPage> pages, boolean clientComplete)
        {
            this.taskInstanceId = taskInstanceId;
            this.token = token;
            this.nextToken = nextToken;
            this.pages = ImmutableList.copyOf(pages);
            this.clientComplete = clientComplete;
        }