Yeb Havinga <yebhavinga@gmail.com> writes:
> Regard the following lattice (direction from top to bottom):
> 1
> |\
> 2 3
> \|\
> 4 5
> \|
> 6
> When adding a constraint to 1, the proper coninhcount for that
> constraint on relation 6 is 2. But the code currently counts to 3, since
> 6 is reached by paths 1-2-4-5, 1-3-4-6, 1-3-5-6.
Mph. I'm not sure that 3 is wrong. You have to consider what happens
during a DROP CONSTRAINT, which as far as I saw this patch didn't
address.
regards, tom lane