On 5th of February, Tom Lane committed patch:
Add num_nulls() and num_nonnulls() to count NULL arguments.
An example use-case is "CHECK(num_nonnulls(a,b,c) = 1)" to assert that
exactly one of a,b,c isn't NULL. The functions are variadic, so they
can also be pressed into service to count the number of null or nonnull
elements in an array.
Marko Tiikkaja, reviewed by Pavel Stehule
Continue reading Waiting for 9.6 – Add num_nulls() and num_nonnulls() to count NULL arguments.
On 18th of July, Stephen Frost committed patch:
WITH CHECK OPTION support for auto-updatable VIEWs
For simple views which are automatically updatable, this patch allows
the user to specify what level of checking should be done on records
being inserted or updated. For 'LOCAL CHECK', new tuples are validated
against the conditionals of the view they are being inserted into, while
for 'CASCADED CHECK' the new tuples are validated against the
conditionals for all views involved (from the top down).
This option is part of the SQL specification.
Dean Rasheed, reviewed by Pavel Stehule
Continue reading Waiting for 9.4 – WITH CHECK OPTION support for auto-updatable VIEWs
On 30th of June, Alvaro Herrera committed patch:
Enable CHECK constraints to be declared NOT VALID
This means that they can initially be added to a large existing table
without checking its initial contents, but new tuples must comply to
them; a separate pass invoked by ALTER TABLE / VALIDATE can verify
existing data and ensure it complies with the constraint, at which point
it is marked validated and becomes a normal part of the table ecosystem.
An non-validated CHECK constraint is ignored in the planner for
constraint_exclusion purposes; when validated, cached plans are
recomputed so that partitioning starts working right away.
This patch also enables domains to have unvalidated CHECK constraints
attached to them as well by way of ALTER DOMAIN / ADD CONSTRAINT / NOT
VALID, which can later be validated with ALTER DOMAIN / VALIDATE
Thanks to Thom Brown, Dean Rasheed and Jaime Casanova for the various
reviews, and Robert Hass for documentation wording improvement
This patch was sponsored by Enova Financial.
Continue reading Waiting for 9.2 – NOT VALID CHECKS