Allow specifying column list for foreign key ON DELETE SET actions
Extend the foreign key ON DELETE actions SET NULL and SET DEFAULT by
allowing the specification of a column list, like
CREATE TABLE posts (
...
FOREIGN KEY (tenant_id, author_id) REFERENCES users ON DELETE SET NULL (author_id)
);
If a column list is specified, only those columns are set to
null/default, instead of all the columns in the foreign-key
constraint.
This is useful for multitenant or sharded schemas, where the tenant or
shard ID is included in the primary key of all tables but shouldn't be
set to null.
Author: Paul Martinez <paulmtz@google.com>
Discussion:
https://www.postgresql.org/message-id/flat/CACqFVBZQyMYJV=njbSMxf+rbDHpx=W=B7AEaMKn8dWn9OZJY7w@mail.gmail.com
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/d6f96ed94e73052f99a2e545ed17a8b2fdc1fb8a
Modified Files
--------------
doc/src/sgml/catalogs.sgml | 12 +++
doc/src/sgml/ddl.sgml | 33 +++++++-
doc/src/sgml/ref/alter_table.sgml | 2 +-
doc/src/sgml/ref/create_table.sgml | 24 ++++--
src/backend/catalog/heap.c | 2 +
src/backend/catalog/index.c | 2 +
src/backend/catalog/pg_constraint.c | 53 +++++++++++-
src/backend/commands/tablecmds.c | 97 +++++++++++++++++++--
src/backend/commands/trigger.c | 2 +
src/backend/commands/typecmds.c | 2 +
src/backend/nodes/copyfuncs.c | 1 +
src/backend/nodes/equalfuncs.c | 1 +
src/backend/nodes/outfuncs.c | 1 +
src/backend/parser/gram.y | 134 +++++++++++++++++++++++++-----
src/backend/utils/adt/ri_triggers.c | 115 ++++++++++++++++++-------
src/backend/utils/adt/ruleutils.c | 10 +++
src/backend/utils/cache/relcache.c | 2 +-
src/include/catalog/catversion.h | 2 +-
src/include/catalog/pg_constraint.h | 11 ++-
src/include/nodes/parsenodes.h | 1 +
src/test/regress/expected/foreign_key.out | 71 ++++++++++++++++
src/test/regress/sql/foreign_key.sql | 51 ++++++++++++
22 files changed, 557 insertions(+), 72 deletions(-)