> then lots of currently perfectly correct
> programs break. If they're the same, then ELSE has different meanings
> depending on whether NULL is specified, and that's generally bad from an
> understanding the language standpoint.
i've already thougth on this
new control structure needed
but the name of the IF is perfect %-)
> In addition, either adding a FALSE and NULL or just a NULL still involves
> looking at the rest of the IF semantics to make sure they make sense. How
> do those interact with ELSIF blocks?
that is because we used to two-valued BOOL...
but anyway i see no clear way to generalize ELSEIF.
may i suppose it was wrong to historically define IF as two-blocks control in
plpgsql ?
forget it.
