Re: BUG #5776: Unable to create view with parameter in PL/pgsql

Pavel,

As far as I'm aware, SETOF return creates whole result in memory, what
has some implications.

My intention was to create a temporary view in session, which can be
used in other processing. Of course, I've found another solution, but
creating view with parameter dynamically could be a good feature.

Andrey

2010/12/14 Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>:
> Hello
>
> View must not has a parameter in PostgreSQL. You can use a SRF function:
>
> postgres=# create or replace function parametrized_view(a int)
>                  returns setof foo as $$
>                     select * from foo where a = $1;
>                  $$ language sql immutable;
> CREATE FUNCTION
> postgres=# select * from parametrized_view(10);
>  a
> ----
>  10
> (1 row)
>
> postgres=# explain select * from parametrized_view(10);
>                          QUERY PLAN
> --------------------------------------------------------------
>  Index Scan using aa on foo  (cost=0.00..8.27 rows=1 width=4)
>   Index Cond: (a = 10)
> (2 rows)
>
> Regards
>
> Pavel Stehule
>
>
> 2010/12/13 Andrey G. <andvgal(at)gmail(dot)com>:
>> It seems my original test, which also includes the EXECUTE approach,
>> has not come to you in full. EXECUTE statement also fails with
>> parameter: The test is attached in file.
>>
>> psql -q < db/db/pgbug_5776.sql
>> ERROR:  there is no parameter $1
>> LINE 1: CREATE VIEW v4 AS SELECT * FROM t1 WHERE some_field = $1
>>                                                               ^
>> QUERY:  CREATE VIEW v4 AS SELECT * FROM t1 WHERE some_field = $1
>> CONTEXT:  PL/pgSQL function "bug_create_tmp_view_exec_test" line 3 at
>> EXECUTE statement
>>
>> Andrey
>>
>>
>> 2010/12/13 Robert Haas <robertmhaas(at)gmail(dot)com>
>>>
>>> On Tue, Nov 30, 2010 at 4:43 PM, Andrey Galkin <andvgal(at)gmail(dot)com> wrote:
>>> >
>>> > The following bug has been logged online:
>>> >
>>> > Bug reference:      5776
>>> > Logged by:          Andrey Galkin
>>> > Email address:      andvgal(at)gmail(dot)com
>>> > PostgreSQL version: 9.0.1
>>> > Operating system:   Debian unstable
>>> > Description:        Unable to create view with parameter in PL/pgsql
>>> > Details:
>>> >
>>> > Below is simple test case. Perhaps, I'm doing something wrong.
>>>
>>> You can accomplish what you're trying to do using EXECUTE.
>>>
>>> --
>>> Robert Haas
>>> EnterpriseDB: http://www.enterprisedb.com
>>> The Enterprise PostgreSQL Company
>>
>>
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>>
>