On Tue, Jul 10, 2012 at 3:44 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> The problem you describe is one of constraints and dependencies and
>> not one of indexes. It seems what you really want is a way to alter
>> foreign key dependencies to depend on a new index. Either an explicit
>> command that lets you set the new dependency or what seems even better
>> would be to have DROP INDEX check any dependent objects to see if
>> there's another index that can satisfy them and change their
>> dependency.
>
> Either of these have exactly the same issue, namely their correctness
> depends on determining if two indexes have identical properties.
This doesn't sound right to me. In these cases all it would have to
know about is the same set of properties that CREATE CONSTRAINT looks
for to find a satisfactory index to depend on.
--
greg