Heikki Linnakangas wrote:
>> How can the executor "see through" a plpgsql function definition? Or do
>> you mean that this reduction is being done at execution time? (hmm ...
>> this is what a one-time filter is, now that I think about it?)
>
> Note that the function is immutable, and the argument in the query is a
> constant. The planner simply runs the function and replaces the function
> call with the result.
The planner runs the function? Ok, neat -- I didn't know it did that.
(In my question above I meant "how can the _planner_ see through the
definition"; I was thinking that the planner had no way to run the
function).
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
