Re: Assert failure in ATPrepAddPrimaryKey

On 2023-Sep-01, Richard Guo wrote:

> I ran into an Assert failure in ATPrepAddPrimaryKey() with the query
> below:
>
> CREATE TABLE t0(c0 boolean);
> CREATE TABLE t1() INHERITS(t0);
>
> # ALTER TABLE t0 ADD CONSTRAINT m EXCLUDE ((1) WITH =);
> server closed the connection unexpectedly

Ugh, right, I failed to make the new function do nothing for this case;
this had no coverage.  Fix attached, with some additional test cases
based on yours.