On Jun 3, 2011 4:20 PM, "Tom Lane" <tgl@sss.pgh.pa.us> wrote:
>
> > [ view definition now fails due to multiple "id_a" columns ]
>
> I'm inclined to write this off as "so don't do that". There's nothing
> that pg_dump can do to make this work: it has to use the USING syntax
> for the join, and that doesn't offer any way to qualify the column name
> on just one side.
There's nothing stopping us from adding a nonstandard syntax to cover
precisely the information needed to resolve this case when dumping.
For example we could support USING (a.a=b.a) or ON (a.a=b.a as a)
We could use it only in this case where there's ambiguity too so it wouldn't
clutter people's dumps.
That said it isn't very appetizing a change to backport so it doesn't do
much for the OP ...