Обсуждение: BUG #5389: Column order on dump/reload broken from defined setof function

The following bug has been logged online:

Bug reference:      5389
Logged by:          Timothy Seever
Email address:      tim.seever@gmail.com
PostgreSQL version: 8.3.5, others
Operating system:   Linux
Description:        Column order on dump/reload broken from defined setof
function
Details:

Adding a column to an inherited table in-place works as expected with the
combined table/etc.  However on dump/reload the physical order changes, so
any? predefined select from a setof function pulling from the combined table
will result in a mismatch.

For example:
  table a:
     col1  text

  table b:
     col2  date

  table c: (inherits a&b)

ALTER table a add column col3 int;

table c now has col3 on the end physically

On dump/restore, it's reordered to the correct place based on the inherited
table... which is fine, except in the following:

--Yes, the following is pointless as is, but with arguments less so
CREATE FUNCTION testfunc() RETURNS setof tablec AS $BODY$ SELECT * FROM
tablec; $BODY$ LANGUAGE 'sql' STABLE;

CREATE VIEW xyz AS select * FROM testfunc() c(col1, col2, col3) where
col2='2010-01-01'::date;

pg_dump dumps the view with the existing label/column order, so upon restore
it's misaligned since it will now be col1, col3, col2 in table c

I'm not sure if there's some additional syntax causing it, but that's
basically what appears to be happening

"Timothy Seever" <tim.seever@gmail.com> writes:
> Adding a column to an inherited table in-place works as expected with the
> combined table/etc.  However on dump/reload the physical order changes, so
> any? predefined select from a setof function pulling from the combined table
> will result in a mismatch.

Yup.  This is not pg_dump's fault, and there's no way for pg_dump to fix
it for you.  Sorry, but you'll need to correct the queries yourself.

            regards, tom lane

"Timothy Seever" <tim.seever@gmail.com> writes:
> CREATE FUNCTION testfunc() RETURNS setof tablec AS $BODY$ SELECT * FROM
> tablec; $BODY$ LANGUAGE 'sql' STABLE;

Common wisdom saith to never ever use "SELECT *" in your code. You just
found out a reason why.

Regards,
--
dim

On Fri, Mar 26, 2010 at 7:00 AM, Dimitri Fontaine
<dfontaine@hi-media.com> wrote:
> "Timothy Seever" <tim.seever@gmail.com> writes:
>> CREATE FUNCTION testfunc() RETURNS setof tablec AS $BODY$ SELECT * FROM
>> tablec; $BODY$ LANGUAGE 'sql' STABLE;
>
> Common wisdom saith to never ever use "SELECT *" in your code. You just
> found out a reason why.

Still pretty annoying though.

...Robert