Re: SQLFunctionCache and generic plans

hI

I can confirm 60% speedup for execution of function fx and fx3 - both
functions are very primitive, so for real code the benefit can be higher

Unfortunately, there is about 5% slowdown for inlined code, and for just
plpgsql code too.

I tested fx4

create or replace function fx4(int) returns int immutable as $$ begin
return $1 + $1; end $$ language plpgsql;

and fx2

create or replace function fx2(int) returns int as $$ select 2 * $1; $$
language sql immutable;

and execution of patched code is about 5% slower. It is strange so this
patch has a negative impact on plpgsql execution.

Regards

Pavel