"David Johnston" <pol...@yahoo.com> writes:
> Trying to answer the previous question this one presented itself: I just
> tried a couple of very simple queries and couldn't get them give me a plan
> that wasn't a "Function Scan". Is it possible that only "scalar" functions
> can be inlined?
> CREATE OR REPLACE FUNCTION three_col_func()
> RETURNS TABLE (col1 varchar, col2 varchar, col3 varchar)
> AS $$
> SELECT '1'::varchar, '2'::varchar, '3'::varchar;
> $$
> LANGUAGE sql
> VOLATILE
> ROWS 1
> ;
No, the problem with that one is that it's marked VOLATILE, which has a
whole set of implications that wouldn't be replicated by an inline
subquery. Try marking it STABLE instead.
There are a pile of other poorly-documented restrictions as well...
one that I notice in a quick look at inline_set_returning_function
is that the function can't be marked STRICT.
regards, tom lane
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