Problems with dump /restore of views

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От Rod Taylor
Тема Problems with dump /restore of views
Дата
Msg-id 1024675612.82060.128.camel@fury.inquent.com
обсуждение исходный текст
Ответы Re: Problems with dump /restore of views  (Tom Lane <tgl@sss.pgh.pa.us>)
Список pgsql-hackers
For some reason a view with a select distinct, an order and an exception
by will cause pg_dump to output a double order by -- one for each select
which of course is bad SQL.


PSQL
====
rbt_t=# create view test as select distinct relname, reltuples, relnatts
from pg_class where relkind = 't' except select relname, reltuples,
relnatts from pg_class where relkind = 't' and relnatts > 4 order by
relname;
CREATE

rbt_t=# select * from test;   relname     | reltuples | relnatts 
----------------+-----------+----------pg_toast_1255  |         0 |        3pg_toast_16384 |         0 |
3pg_toast_16386|         0 |        3pg_toast_16408 |         0 |        3pg_toast_16410 |         5 |
3pg_toast_16416|         0 |        3
 



PG_DUMP
=======
--
-- TOC Entry ID 2 (OID 337283)
--
-- Name: test Type: VIEW Owner: rbt
--

CREATE VIEW "test" as SELECT DISTINCT pg_class.relname,
pg_class.reltuples, pg_class.relnatts FROM pg_class WHERE
(pg_class.relkind = 't'::"char") ORDER BY pg_class.relname,
pg_class.reltuples, pg_class.relnatts EXCEPT SELECT pg_class.relname,
pg_class.reltuples, pg_class.relnatts FROM pg_class WHERE
((pg_class.relkind = 't'::"char") AND (pg_class.relnatts > 4)) ORDER BY
1;


PSQL
====
rbt_t=# drop view test;
DROP
rbt_t=# CREATE VIEW "test" as SELECT DISTINCT pg_class.relname,
pg_class.reltuples, pg_class.relnatts FROM pg_class WHERE
(pg_class.relkind = 't'::"char") ORDER BY pg_class.relname,
pg_class.reltuples, pg_class.relnatts EXCEPT SELECT pg_class.relname,
pg_class.reltuples, pg_class.relnatts FROM pg_class WHERE
((pg_class.relkind = 't'::"char") AND (pg_class.relnatts > 4)) ORDER BY
1;
ERROR:  parser: parse error at or near "EXCEPT"



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