Neil Conway <[EMAIL PROTECTED]> writes:
> Bruno Wolff III wrote:
>> Functions are just black boxes to the planner.

> ... unless the function is a SQL function that is trivial enough for the 
> planner to inline it into the plan of the invoking query. Currently, we 
> won't inline set-returning SQL functions that are used in the query's 
> rangetable, though. This would be worth doing, I think -- I'm not sure 
> how much work it would be, though.

Yeah, I've been thinking the same.  It seems like it shouldn't be unduly
difficult --- not harder than inlining scalar-valued SQL functions, just
different validity conditions.

                        regards, tom lane

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