David Rowley writes:
> On Sat, Aug 9, 2014 at 3:34 PM, Tom Lane wrote:
>> There's no need for a new error message I think, because we should just
>> ignore such indexes. After all, there might be a valid matching index
>> later on.
> hmm, but if the user attempts to define the foreign key that
On Sat, Aug 9, 2014 at 3:34 PM, Tom Lane wrote:
> David Rowley writes:
> > On Sat, Aug 9, 2014 at 12:13 PM, Tom Lane wrote:
> >> So I'm thinking you're right: we should rewrite this code so that only
> >> indexes having all columns distinct can match, thereby ensuring that
> there
> >> is only
David Rowley writes:
> On Sat, Aug 9, 2014 at 12:13 PM, Tom Lane wrote:
>> So I'm thinking you're right: we should rewrite this code so that only
>> indexes having all columns distinct can match, thereby ensuring that there
>> is only one possible interpretation of the equality semantics for the
On Sat, Aug 9, 2014 at 12:13 PM, Tom Lane wrote:
>
> So I'm thinking you're right: we should rewrite this code so that only
> indexes having all columns distinct can match, thereby ensuring that there
> is only one possible interpretation of the equality semantics for the
> foreign key.
>
>
I've
I wrote:
> David Rowley writes:
>> The attached seems to fix the problem, but the whole thing makes me wonder
>> if this is even meant to be allowed? I was thinking that this might be a
>> good time to disallow this altogether, since it's already broken and looks
>> like it has been for about 11 y
David Rowley writes:
> I wasn't quite sure if it was possible to include the same column twice in
> a foreign key, so I tested
> create table r1 (a int);
> create table r2 (b int);
> create unique index on r2(b,b);
> alter table r1 add constraint r2_b_fkey foreign key (a,a) references r2
> (b
In master I've been testing some new code that I'm working on around
foreign keys.
I wasn't quite sure if it was possible to include the same column twice in
a foreign key, so I tested
create table r1 (a int);
create table r2 (b int);
create unique index on r2(b,b);
alter table r1 add constrai
