"Hiroshi Inoue" <Inoue@tpf.co.jp> writes:
> The implementation makes the dropped column invisible by
> changing its attnum to -attnum - offset(currently 20) and
> attnam to ("*already Dropped%d",attnum).
Ugh. No wonder you had to hack so many places in such an ugly fashion.
Why not leave the attnum as-is, and just add a bool saying "column is
dropped" to pg_attribute? As long as the parser ignores columns marked
that way for field lookup and expansion of *, it seems the rest of the
system wouldn't need to treat dropped columns specially in any way.
regards, tom lane