Re: Patch to add functionality to specify ORDER BY in CREATE FUNCTION for SRFs - Mailing list pgsql-hackers

On 1/6/15, 1:00 AM, Ashutosh Bapat wrote:
>
> Even checking whether the output of the function is in the right order or not, has its cost. I am suggesting that we
caneliminate this cost as well. For example, PostgreSQL does not check whether a function is really immutable or not.
 

Actually, it does:

select test();
ERROR:  UPDATE is not allowed in a non-volatile function
CONTEXT:  SQL statement "UPDATE i SET i=i+1"PL/pgSQL function test() line 3 at SQL statement
STATEMENT:  select test();
ERROR:  UPDATE is not allowed in a non-volatile function
CONTEXT:  SQL statement "UPDATE i SET i=i+1"
PL/pgSQL function test() line 3 at SQL statement

-- 
Jim Nasby, Data Architect, Blue Treble Consulting
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