Re: BUG #5035: cast 'text' to 'name' doesnt work in plpgsqlfunction

Hello

2009/9/7 Tomasz Karlik <Tomasz(dot)Karlik(at)ultimo(dot)pl>:
>
>
>>>> Alvaro Herrera <alvherre(at)commandprompt(dot)com> 9/4/2009 7:23 PM >>>
> tkarlik(at)ultimo(dot)pl wrote:
>
>> Without casting function executes much slower:
>>
>> CREATE OR REPLACE FUNCTION table_exists(tblname text) RETURNS boolean AS '
>> DECLARE
>> exists boolean;
>> BEGIN
>>     SELECT 1 INTO exists FROM pg_class WHERE relname = name($1);
>>     RETURN exists;
>> END;
>> ' LANGUAGE 'plpgsql' IMMUTABLE;
>

it some strange. What version do you use?

on 5.4

postgres=# explain select * from pg_class where relname='aaa';
QUERY PLAN

--------------------------------------------------------------------------------
-------------
Index Scan using pg_class_relname_nsp_index on pg_class (cost=0.00..8.27 rows=
1 width=185)
Index Cond: (relname = 'aaa'::name)
(2 rows)

the casting is implicit.

regards
Pavel Stehule

> If you're looking for a speedy answer, try a SQL function, not plpgsql.
>
>
> The same issue when using SQL function... However other casting (for example
> int4->int8) works properly.
>