The previous description listed the constraint types that this column
was used for, but that was outdated, since not-valid not-null
constraints are now possible. So just remove that qualification,
rather than trying to keep it updated.
Author: jian he
Reviewed-by: Robert Treat
Discussion: https://www.postgresql.org/message-id/flat/CACJufxFo4yTwzbSZrP%2BzQiR6_M00skoZMFaUnNJCdY6he%3DuQfA%40mail.gmail.com
Has the constraint been validated?
- Currently, can be false only for foreign keys and CHECK constraints