pgsql: Allow CHECK constraints to be declared ONLY

Allow CHECK constraints to be declared ONLY

This makes them enforceable only on the parent table, not on children
tables.  This is useful in various situations, per discussion involving
people bitten by the restrictive behavior introduced in 8.4.

Message-Id:
8762mp93iw.fsf@comcast.net
CAFaPBrSMMpubkGf4zcRL_YL-AERUbYF_-ZNNYfb3CVwwEqc9TQ@mail.gmail.com

Authors: Nikhil Sontakke, Alex Hunsaker
Reviewed by Robert Haas and myself

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/61d81bd28dbec65a6b144e0cd3d0bfe25913c3ac

Modified Files
--------------
doc/src/sgml/catalogs.sgml                |   10 ++++++
doc/src/sgml/ref/alter_table.sgml         |    8 +++++
src/backend/catalog/heap.c                |   28 +++++++++++-----
src/backend/catalog/index.c               |    3 +-
src/backend/catalog/pg_constraint.c       |    4 ++-
src/backend/commands/tablecmds.c          |   50 ++++++++++++++++++++---------
src/backend/commands/trigger.c            |    3 +-
src/backend/commands/typecmds.c           |    3 +-
src/backend/utils/cache/relcache.c        |    1 +
src/bin/pg_dump/pg_dump.c                 |   44 +++++++++++++++++---------
src/bin/pg_dump/pg_dump.h                 |    1 +
src/bin/psql/describe.c                   |   19 ++++++++---
src/include/access/tupdesc.h              |    1 +
src/include/catalog/heap.h                |    4 ++-
src/include/catalog/pg_constraint.h       |   25 +++++++++------
src/test/regress/expected/alter_table.out |   21 ++++++------
src/test/regress/expected/inherit.out     |   35 ++++++++++++++++++++
src/test/regress/sql/alter_table.sql      |   15 ++++-----
src/test/regress/sql/inherit.sql          |   14 ++++++++
19 files changed, 211 insertions(+), 78 deletions(-)