On Thu, 2002-09-05 at 19:23, Tom Lane wrote:
> I really like Hannu's idea of storing an entire (single-inheritance)
> hierarchy in a single file.
>
> I guess the question we need to ask ourselves is if we're prepared to
> abandon support of multiple inheritance. Personally I am, but...
So am I, but I think we should move in stages -
1) first implement the SQL99 standard CREATE TABLE mytable() UNDER parenttable ; using the above idea and make it
workright vs constraints, triggers, functions, etc.
This should include the ability to include other table structures using LIKE :
CREATE TABLE engine(...); CREATE TABLE vehicule(...); CREATE TABLE car ( model text, wheels wheel[],
LIKEengine, ) UNDER vehicule;
which could then hopefully be used for migrating most code of form
CREATE TABLE car ( model text primary key, wheels wheel[] ) INHERITS (vehicule, engine);
it would be nice (maybe even neccessary) to keep the current functionality that columns introduced by LIKE are
automatically added/renamed/deleted when LIKE's base table changes.
2) when it is working announce non-SQL99-standard-and-broken INHERITS to be deprecated and removed in future.
3) give people time for some releases to move over to UNDER + LIKE . Or if someone comes up with bright
ideas/impementationsfor fixing multiple inheritance, then un-deprecate and keep it.
4) else try to remove INHERITS.
5) if too many people object, goto 3) ;)
-------------------
Hannu
