在pipelinedb中,我似乎找不到列出我创建的所有流和连续视图的方法。
我可以通过查找创建的“mrel”表返回到CVs中,但它有点笨重。
是否有系统表或视图可供我查询以列出它们?

最佳答案

您可能有较旧版本的pipelinedb,或者正在查看较旧版本的文档。
您可以使用psql检查您的版本,如下所示:

pipeline=# select * from pipeline_version();
                                                                     pipeline_version
-----------------------------------------------------------------------------------------------------------------------------------------------------------
 PipelineDB 0.9.0 at revision b1ea9ab6acb689e6ed69fb26af555ca8d025ebae on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 4.8.4-2ubuntu1~14.04) 4.8.4, 64-bit
(1 row)

在最新版本中,可以获得有关视图的信息,如下所示:
pipeline=# select * from pipeline_views();
 id | schema | name |         query
----+--------+------+-----------------------
 11 | public | cv   |  SELECT x::integer,  +
    |        |      |     count(*) AS count+
    |        |      |    FROM ONLY s       +
    |        |      |   GROUP BY x::integer
(1 row)

有关流的信息可以这样获得:
pipeline=# select * from pipeline_streams();
 schema | name | inferred | queries |                tup_desc
--------+------+----------+---------+----------------------------------------
 public | s    | t        | {cv}    | \x000000017800000006a4ffffffff00000000
(1 row)

更多信息可以使用\d+:
pipeline=# \d+ cv
             Continuous view "public.cv"
 Column |  Type   | Modifiers | Storage | Description
--------+---------+-----------+---------+-------------
 x      | integer |           | plain   |
 count  | bigint  |           | plain   |
View definition:
 SELECT x::integer,
    count(*) AS count
   FROM ONLY s
  GROUP BY x::integer;

pipeline=# \d+ s
                     Stream "public.s"
      Column       |            Type             | Storage
-------------------+-----------------------------+---------
 arrival_timestamp | timestamp(0) with time zone | plain

10-04 10:42