Re: Materialized views WIP patch

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От Thom Brown
Тема Re: Materialized views WIP patch
Дата
Msg-id CAA-aLv52bEa58aYUGCO4hZY+kiL6RGi-+_eJEz-FNzznVpbNMQ@mail.gmail.com
обсуждение исходный текст
Ответ на Re: Materialized views WIP patch  ("Kevin Grittner" <kgrittn@mail.com>)
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On 16 January 2013 05:40, Kevin Grittner <kgrittn@mail.com> wrote:
Here is a new version of the patch, with most issues discussed in
previous posts fixed.

I've been struggling with two areas:

 - pg_dump sorting for MVs which depend on other MVs
 - proper handling of the relisvalid flag for unlogged MVs after recovery

Some weirdness:

postgres=# CREATE VIEW v_test2 AS SELECT 1 moo;
CREATE VIEW
postgres=# CREATE MATERIALIZED VIEW mv_test2 AS SELECT moo, 2*moo FROM v_test2 UNION ALL SELECT moo, 3*moo FROM v_test2;
SELECT 2
postgres=# \d+ mv_test2
                  Materialized view "public.mv_test2"
  Column  |  Type   | Modifiers | Storage | Stats target | Description 
----------+---------+-----------+---------+--------------+-------------
 moo      | integer |           | plain   |              | 
 ?column? | integer |           | plain   |              | 
View definition:
 SELECT "*SELECT* 1".moo, "*SELECT* 1"."?column?";
Has OIDs: no

The "weirdness" I refer you to is the view definition.  This does not occur with a straightforward UNION.

This does not occur with a regular view:

postgres=# CREATE VIEW v_test3 AS SELECT moo, 2*moo FROM v_test2 UNION ALL SELECT moo, 3*moo FROM v_test2;
CREATE VIEW
postgres=# \d+ v_test3
                 View "public.v_test3"
  Column  |  Type   | Modifiers | Storage | Description 
----------+---------+-----------+---------+-------------
 moo      | integer |           | plain   | 
 ?column? | integer |           | plain   | 
View definition:
         SELECT v_test2.moo, 2 * v_test2.moo
           FROM v_test2
UNION ALL 
         SELECT v_test2.moo, 3 * v_test2.moo
           FROM v_test2;

--
Thom

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