Re: extend pgbench expressions with functions

Hello Michaël,

> Using a pointer to the tail of the list would make the code simple,
> and save a couple of lines.

I did that, see v27 attached.

Note that it does not save any lines, because the reverse function is 
removed, but then you need another type to keep the head & tail, the link 
type is not enough, and then you have to manage that stuff in the code. 
Whether it is "simpler" is debatable. It probably costs more tests when 
executed.

However, it really saves having to answer the question "why is the list 
reversed?", which is definitely a win from my point of view:-)

> Another thing that could be considered is also to move list.c [...]

I think that this option is too much bother for the small internal purpose 
at hand.

-- 
Fabien.