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Add ALTER TABLE ... ALTER CONSTRAINT ... SET [NO] INHERIT

Browse Source 
This allows to redefine an existing non-inheritable constraint to be
inheritable, which allows to straighten up situations with NO INHERIT
constraints so that thay can become normal constraints without having to
re-verify existing data.  For existing inheritance children this may
require creating additional constraints, if they don't exist already.

It also allows to do the opposite, if only for symmetry.

Author: Suraj Kharage <suraj.kharage@enterprisedb.com>
Reviewed-by: jian he <jian.universality@gmail.com>
Discussion: https://postgr.es/m/CAF1DzPVfOW6Kk=7SSh7LbneQDJWh=PbJrEC_Wkzc24tHOyQWGg@mail.gmail.com
This commit is contained in:
Álvaro Herrera 2025-03-05 13:50:22 +01:00
parent f4694e0f35
commit f4e53e10b6
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GPG Key ID: 1C20ACB9D5C564AE
6 changed files with 359 additions and 19 deletions
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23
doc/src/sgml/ref/alter_table.sgml
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@ -59,6 +59,7 @@ ALTER TABLE [ IF EXISTS ] <replaceable class="parameter">name</replaceable>
ADD <replaceable class="parameter">table_constraint</replaceable> [ NOT VALID ]
ADD <replaceable class="parameter">table_constraint_using_index</replaceable>
ALTER CONSTRAINT <replaceable class="parameter">constraint_name</replaceable> [ DEFERRABLE | NOT DEFERRABLE ] [ INITIALLY DEFERRED | INITIALLY IMMEDIATE ]
ALTER CONSTRAINT <replaceable class="parameter">constraint_name</replaceable> SET [ INHERIT | NO INHERIT ]
VALIDATE CONSTRAINT <replaceable class="parameter">constraint_name</replaceable>
DROP CONSTRAINT [ IF EXISTS ] <replaceable class="parameter">constraint_name</replaceable> [ RESTRICT | CASCADE ]
DISABLE TRIGGER [ <replaceable class="parameter">trigger_name</replaceable> | ALL | USER ]
@ -556,7 +557,27 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
<listitem>
<para>
This form alters the attributes of a constraint that was previously
created. Currently only foreign key constraints may be altered.
created. Currently only foreign key constraints may be altered in
this fashion, but see below.
</para>
</listitem>
</varlistentry>
<varlistentry id="sql-altertable-desc-alter-constraint-inherit">
<term><literal>ALTER CONSTRAINT ... SET INHERIT</literal></term>
<term><literal>ALTER CONSTRAINT ... SET NO INHERIT</literal></term>
<listitem>
<para>
These forms modify a inheritable constraint so that it becomes not
inheritable, or vice-versa. Only not-null constraints may be altered
in this fashion at present.
In addition to changing the inheritability status of the constraint,
in the case where a non-inheritable constraint is being marked
inheritable, if the table has children, an equivalent constraint
will be added to them. If marking an inheritable constraint as
non-inheritable on a table with children, then the corresponding
constraint on children will be marked as no longer inherited,
but not removed.
</para>
</listitem>
</varlistentry>

115
src/backend/commands/tablecmds.c
View File

@ -389,9 +389,10 @@ static void AlterIndexNamespaces(Relation classRel, Relation rel,
static void AlterSeqNamespaces(Relation classRel, Relation rel,
Oid oldNspOid, Oid newNspOid, ObjectAddresses *objsMoved,
LOCKMODE lockmode);
static ObjectAddress ATExecAlterConstraint(Relation rel, ATAlterConstraint *cmdcon,
static ObjectAddress ATExecAlterConstraint(List **wqueue, Relation rel,
ATAlterConstraint *cmdcon,
bool recurse, LOCKMODE lockmode);
static bool ATExecAlterConstraintInternal(ATAlterConstraint *cmdcon, Relation conrel,
static bool ATExecAlterConstraintInternal(List **wqueue, ATAlterConstraint *cmdcon, Relation conrel,
Relation tgrel, Relation rel, HeapTuple contuple,
bool recurse, List **otherrelids, LOCKMODE lockmode);
static void AlterConstrTriggerDeferrability(Oid conoid, Relation tgrel, Relation rel,
@ -5437,8 +5438,8 @@ ATExecCmd(List **wqueue, AlteredTableInfo *tab,
lockmode);
break;
case AT_AlterConstraint: /* ALTER CONSTRAINT */
address = ATExecAlterConstraint(rel, castNode(ATAlterConstraint,
cmd->def),
address = ATExecAlterConstraint(wqueue, rel,
castNode(ATAlterConstraint, cmd->def),
cmd->recurse, lockmode);
break;
case AT_ValidateConstraint: /* VALIDATE CONSTRAINT */
@ -11813,14 +11814,14 @@ GetForeignKeyCheckTriggers(Relation trigrel,
*
* Update the attributes of a constraint.
*
* Currently only works for Foreign Key constraints.
* Currently only works for Foreign Key and not null constraints.
*
* If the constraint is modified, returns its address; otherwise, return
* InvalidObjectAddress.
*/
static ObjectAddress
ATExecAlterConstraint(Relation rel, ATAlterConstraint *cmdcon, bool recurse,
LOCKMODE lockmode)
ATExecAlterConstraint(List **wqueue, Relation rel, ATAlterConstraint *cmdcon,
bool recurse, LOCKMODE lockmode)
{
Relation conrel;
Relation tgrel;
@ -11871,11 +11872,26 @@ ATExecAlterConstraint(Relation rel, ATAlterConstraint *cmdcon, bool recurse,
cmdcon->conname, RelationGetRelationName(rel))));
currcon = (Form_pg_constraint) GETSTRUCT(contuple);
if (currcon->contype != CONSTRAINT_FOREIGN)
if (cmdcon->alterDeferrability && currcon->contype != CONSTRAINT_FOREIGN)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("constraint \"%s\" of relation \"%s\" is not a foreign key constraint",
cmdcon->conname, RelationGetRelationName(rel))));
if (cmdcon->alterInheritability &&
currcon->contype != CONSTRAINT_NOTNULL)
ereport(ERROR,
errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("constraint \"%s\" of relation \"%s\" is not a not-null constraint",
cmdcon->conname, RelationGetRelationName(rel)));
/* Refuse to modify inheritability of inherited constraints */
if (cmdcon->alterInheritability &&
cmdcon->noinherit && currcon->coninhcount > 0)
ereport(ERROR,
errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("cannot alter inherited constraint \"%s\" on relation \"%s\"",
NameStr(currcon->conname),
RelationGetRelationName(rel)));
/*
* If it's not the topmost constraint, raise an error.
@ -11926,8 +11942,8 @@ ATExecAlterConstraint(Relation rel, ATAlterConstraint *cmdcon, bool recurse,
/*
* Do the actual catalog work, and recurse if necessary.
*/
if (ATExecAlterConstraintInternal(cmdcon, conrel, tgrel, rel, contuple,
recurse, &otherrelids, lockmode))
if (ATExecAlterConstraintInternal(wqueue, cmdcon, conrel, tgrel, rel,
contuple, recurse, &otherrelids, lockmode))
ObjectAddressSet(address, ConstraintRelationId, currcon->oid);
/*
@ -11958,9 +11974,10 @@ ATExecAlterConstraint(Relation rel, ATAlterConstraint *cmdcon, bool recurse,
* but existing releases don't do that.)
*/
static bool
ATExecAlterConstraintInternal(ATAlterConstraint *cmdcon, Relation conrel,
Relation tgrel, Relation rel, HeapTuple contuple,
bool recurse, List **otherrelids, LOCKMODE lockmode)
ATExecAlterConstraintInternal(List **wqueue, ATAlterConstraint *cmdcon,
Relation conrel, Relation tgrel, Relation rel,
HeapTuple contuple, bool recurse,
List **otherrelids, LOCKMODE lockmode)
{
Form_pg_constraint currcon;
Oid refrelid = InvalidOid;
@ -12040,14 +12057,82 @@ ATExecAlterConstraintInternal(ATAlterConstraint *cmdcon, Relation conrel,
Relation childrel;
childrel = table_open(childcon->conrelid, lockmode);
ATExecAlterConstraintInternal(cmdcon, conrel, tgrel, childrel, childtup,
recurse, otherrelids, lockmode);
ATExecAlterConstraintInternal(wqueue, cmdcon, conrel, tgrel, childrel,
childtup, recurse, otherrelids, lockmode);
table_close(childrel, NoLock);
}
systable_endscan(pscan);
}
/*
* Update the catalog for inheritability. No work if the constraint is
* already in the requested state.
*/
if (cmdcon->alterInheritability &&
(cmdcon->noinherit != currcon->connoinherit))
{
AttrNumber colNum;
char *colName;
List *children;
HeapTuple copyTuple;
Form_pg_constraint copy_con;
/* The current implementation only works for NOT NULL constraints */
Assert(currcon->contype == CONSTRAINT_NOTNULL);
copyTuple = heap_copytuple(contuple);
copy_con = (Form_pg_constraint) GETSTRUCT(copyTuple);
copy_con->connoinherit = cmdcon->noinherit;
CatalogTupleUpdate(conrel, &copyTuple->t_self, copyTuple);
CommandCounterIncrement();
heap_freetuple(copyTuple);
changed = true;
/* Fetch the column number and name */
colNum = extractNotNullColumn(contuple);
colName = get_attname(currcon->conrelid, colNum, false);
/*
* Propagate the change to children. For SET NO INHERIT, we don't
* recursively affect children, just the immediate level.
*/
children = find_inheritance_children(RelationGetRelid(rel),
lockmode);
foreach_oid(childoid, children)
{
ObjectAddress addr;
if (cmdcon->noinherit)
{
HeapTuple childtup;
Form_pg_constraint childcon;
childtup = findNotNullConstraint(childoid, colName);
if (!childtup)
elog(ERROR, "cache lookup failed for not-null constraint on column \"%s\" of relation %u",
colName, childoid);
childcon = (Form_pg_constraint) GETSTRUCT(childtup);
Assert(childcon->coninhcount > 0);
childcon->coninhcount--;
childcon->conislocal = true;
CatalogTupleUpdate(conrel, &childtup->t_self, childtup);
heap_freetuple(childtup);
}
else
{
Relation childrel = table_open(childoid, NoLock);
addr = ATExecSetNotNull(wqueue, childrel, NameStr(currcon->conname),
colName, true, true, lockmode);
if (OidIsValid(addr.objectId))
CommandCounterIncrement();
table_close(childrel, NoLock);
}
}
}
return changed;
}

28
src/backend/parser/gram.y
View File

@ -2669,6 +2669,34 @@ alter_table_cmd:
NULL, NULL, NULL, yyscanner);
$$ = (Node *) n;
}
/* ALTER TABLE <name> ALTER CONSTRAINT SET INHERIT */
| ALTER CONSTRAINT name SET INHERIT
{
AlterTableCmd *n = makeNode(AlterTableCmd);
ATAlterConstraint *c = makeNode(ATAlterConstraint);
n->subtype = AT_AlterConstraint;
n->def = (Node *) c;
c->conname = $3;
c->alterInheritability = true;
c->noinherit = false;
$$ = (Node *) n;
}
/* ALTER TABLE <name> ALTER CONSTRAINT SET NO INHERIT */
| ALTER CONSTRAINT name SET NO INHERIT
{
AlterTableCmd *n = makeNode(AlterTableCmd);
ATAlterConstraint *c = makeNode(ATAlterConstraint);
n->subtype = AT_AlterConstraint;
n->def = (Node *) c;
c->conname = $3;
c->alterInheritability = true;
c->noinherit = true;
$$ = (Node *) n;
}
/* ALTER TABLE <name> VALIDATE CONSTRAINT ... */
| VALIDATE CONSTRAINT name
{

2
src/include/nodes/parsenodes.h
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@ -2493,6 +2493,8 @@ typedef struct ATAlterConstraint
bool alterDeferrability; /* changing deferrability properties? */
bool deferrable; /* DEFERRABLE? */
bool initdeferred; /* INITIALLY DEFERRED? */
bool alterInheritability; /* changing inheritability properties */
bool noinherit;
} ATAlterConstraint;
/* Ad-hoc node for AT_ReplicaIdentity */

131
src/test/regress/expected/inherit.out
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@ -2505,8 +2505,10 @@ CREATE TABLE inh_nn3 (a int not null, b int, not null a no inherit);
ERROR: conflicting NO INHERIT declaration for not-null constraint on column "a"
CREATE TABLE inh_nn4 (a int not null no inherit, b int, not null a);
ERROR: conflicting NO INHERIT declaration for not-null constraint on column "a"
DROP TABLE inh_nn1, inh_nn2, inh_nn3, inh_nn4;
ERROR: table "inh_nn2" does not exist
DROP TABLE IF EXISTS inh_nn1, inh_nn2, inh_nn3, inh_nn4;
NOTICE: table "inh_nn2" does not exist, skipping
NOTICE: table "inh_nn3" does not exist, skipping
NOTICE: table "inh_nn4" does not exist, skipping
--
-- test inherit/deinherit
--
@ -2744,6 +2746,131 @@ NOTICE: drop cascades to 2 other objects
DETAIL: drop cascades to table inh_multiparent
drop cascades to table inh_multiparent2
--
-- Test ALTER CONSTRAINT SET [NO] INHERIT
--
create table inh_nn1 (f1 int not null no inherit);
create table inh_nn2 (f2 text, f3 int, f1 int);
alter table inh_nn2 inherit inh_nn1;
create table inh_nn3 (f4 float) inherits (inh_nn2);
create table inh_nn4 (f5 int, f4 float, f2 text, f3 int, f1 int);
alter table inh_nn4 inherit inh_nn2, inherit inh_nn1, inherit inh_nn3;
alter table inh_nn1 alter constraint inh_nn1_f1_not_null set inherit;
select conrelid::regclass, conname, conkey, coninhcount, conislocal, connoinherit
from pg_constraint where contype = 'n' and
conrelid::regclass::text in ('inh_nn1', 'inh_nn2', 'inh_nn3', 'inh_nn4')
order by 2, 1;
conrelid | conname | conkey | coninhcount | conislocal | connoinherit
----------+---------------------+--------+-------------+------------+--------------
inh_nn1 | inh_nn1_f1_not_null | {1} | 0 | t | f
inh_nn2 | inh_nn1_f1_not_null | {3} | 1 | f | f
inh_nn3 | inh_nn1_f1_not_null | {3} | 1 | f | f
inh_nn4 | inh_nn1_f1_not_null | {5} | 3 | f | f
(4 rows)
-- ALTER CONSTRAINT SET NO INHERIT should work on top-level constraints
alter table inh_nn1 alter constraint inh_nn1_f1_not_null set no inherit;
select conrelid::regclass, conname, conkey, coninhcount, conislocal, connoinherit
from pg_constraint where contype = 'n' and
conrelid::regclass::text in ('inh_nn1', 'inh_nn2', 'inh_nn3', 'inh_nn4')
order by 2, 1;
conrelid | conname | conkey | coninhcount | conislocal | connoinherit
----------+---------------------+--------+-------------+------------+--------------
inh_nn1 | inh_nn1_f1_not_null | {1} | 0 | t | t
inh_nn2 | inh_nn1_f1_not_null | {3} | 0 | t | f
inh_nn3 | inh_nn1_f1_not_null | {3} | 1 | f | f
inh_nn4 | inh_nn1_f1_not_null | {5} | 2 | t | f
(4 rows)
-- A constraint that's NO INHERIT can be dropped without damaging children
alter table inh_nn1 drop constraint inh_nn1_f1_not_null;
select conrelid::regclass, conname, coninhcount, conislocal, connoinherit
from pg_constraint where contype = 'n' and
conrelid::regclass::text in ('inh_nn1', 'inh_nn2', 'inh_nn3', 'inh_nn4')
order by 2, 1;
conrelid | conname | coninhcount | conislocal | connoinherit
----------+---------------------+-------------+------------+--------------
inh_nn2 | inh_nn1_f1_not_null | 0 | t | f
inh_nn3 | inh_nn1_f1_not_null | 1 | f | f
inh_nn4 | inh_nn1_f1_not_null | 2 | t | f
(3 rows)
drop table inh_nn1, inh_nn2, inh_nn3, inh_nn4;
-- Test inherit constraint and make sure it validates.
create table inh_nn1 (f1 int not null no inherit);
create table inh_nn2 (f2 text, f3 int) inherits (inh_nn1);
insert into inh_nn2 values(NULL, 'sample', 1);
alter table inh_nn1 alter constraint inh_nn1_f1_not_null set inherit;
ERROR: column "f1" of relation "inh_nn2" contains null values
delete from inh_nn2;
create table inh_nn3 () inherits (inh_nn2);
create table inh_nn4 () inherits (inh_nn1, inh_nn2);
NOTICE: merging multiple inherited definitions of column "f1"
alter table inh_nn1 -- test multicommand alter table while at it
alter constraint inh_nn1_f1_not_null set inherit,
alter constraint inh_nn1_f1_not_null set no inherit;
select conrelid::regclass, conname, coninhcount, conislocal, connoinherit
from pg_constraint where contype = 'n' and
conrelid::regclass::text in ('inh_nn1', 'inh_nn2', 'inh_nn3', 'inh_nn4')
order by 2, 1;
conrelid | conname | coninhcount | conislocal | connoinherit
----------+---------------------+-------------+------------+--------------
inh_nn1 | inh_nn1_f1_not_null | 0 | t | t
inh_nn2 | inh_nn1_f1_not_null | 0 | t | f
inh_nn3 | inh_nn1_f1_not_null | 1 | f | f
inh_nn4 | inh_nn1_f1_not_null | 1 | t | f
(4 rows)
drop table inh_nn1, inh_nn2, inh_nn3, inh_nn4;
-- Test not null inherit constraint which already exists on child table.
create table inh_nn1 (f1 int not null no inherit);
create table inh_nn2 (f2 text, f3 int) inherits (inh_nn1);
create table inh_nn3 (f4 float, constraint nn3_f1 not null f1 no inherit) inherits (inh_nn1, inh_nn2);
NOTICE: merging multiple inherited definitions of column "f1"
select conrelid::regclass, conname, conkey, coninhcount, conislocal, connoinherit
from pg_constraint where contype = 'n' and
conrelid::regclass::text in ('inh_nn1', 'inh_nn2', 'inh_nn3')
order by 2, 1;
conrelid | conname | conkey | coninhcount | conislocal | connoinherit
----------+---------------------+--------+-------------+------------+--------------
inh_nn1 | inh_nn1_f1_not_null | {1} | 0 | t | t
inh_nn3 | nn3_f1 | {1} | 0 | t | t
(2 rows)
-- error: inh_nn3 has an incompatible NO INHERIT constraint
alter table inh_nn1 alter constraint inh_nn1_f1_not_null set inherit;
ERROR: cannot change NO INHERIT status of NOT NULL constraint "nn3_f1" on relation "inh_nn3"
alter table inh_nn3 alter constraint nn3_f1 set inherit;
alter table inh_nn1 alter constraint inh_nn1_f1_not_null set inherit; -- now it works
select conrelid::regclass, conname, conkey, coninhcount, conislocal, connoinherit
from pg_constraint where contype = 'n' and
conrelid::regclass::text in ('inh_nn1', 'inh_nn2', 'inh_nn3')
order by 2, 1;
conrelid | conname | conkey | coninhcount | conislocal | connoinherit
----------+---------------------+--------+-------------+------------+--------------
inh_nn1 | inh_nn1_f1_not_null | {1} | 0 | t | f
inh_nn2 | inh_nn1_f1_not_null | {1} | 1 | f | f
inh_nn3 | nn3_f1 | {1} | 2 | t | f
(3 rows)
drop table inh_nn1, inh_nn2, inh_nn3;
-- Negative scenarios for alter constraint .. set inherit.
create table inh_nn1 (f1 int check(f1 > 5) primary key references inh_nn1, f2 int not null);
-- constraints other than not-null are not supported
alter table inh_nn1 alter constraint inh_nn1_f1_check set inherit;
ERROR: constraint "inh_nn1_f1_check" of relation "inh_nn1" is not a not-null constraint
alter table inh_nn1 alter constraint inh_nn1_pkey set inherit;
ERROR: constraint "inh_nn1_pkey" of relation "inh_nn1" is not a not-null constraint
alter table inh_nn1 alter constraint inh_nn1_f1_fkey set inherit;
ERROR: constraint "inh_nn1_f1_fkey" of relation "inh_nn1" is not a not-null constraint
-- try to drop a nonexistant constraint
alter table inh_nn1 alter constraint foo set inherit;
ERROR: constraint "foo" of relation "inh_nn1" does not exist
-- Can't modify inheritability of inherited constraints
create table inh_nn2 () inherits (inh_nn1);
alter table inh_nn2 alter constraint inh_nn1_f2_not_null set no inherit;
ERROR: cannot alter inherited constraint "inh_nn1_f2_not_null" on relation "inh_nn2"
drop table inh_nn1, inh_nn2;
--
-- Mixed ownership inheritance tree
--
create role regress_alice;

79
src/test/regress/sql/inherit.sql
View File

@ -957,7 +957,7 @@ CREATE TABLE inh_nn1 (a int not null);
CREATE TABLE inh_nn2 (a int not null no inherit) INHERITS (inh_nn1);
CREATE TABLE inh_nn3 (a int not null, b int, not null a no inherit);
CREATE TABLE inh_nn4 (a int not null no inherit, b int, not null a);
DROP TABLE inh_nn1, inh_nn2, inh_nn3, inh_nn4;
DROP TABLE IF EXISTS inh_nn1, inh_nn2, inh_nn3, inh_nn4;
--
-- test inherit/deinherit
@ -1090,6 +1090,83 @@ select conrelid::regclass, contype, conname,
drop table inh_p1, inh_p2, inh_p3, inh_p4 cascade;
--
-- Test ALTER CONSTRAINT SET [NO] INHERIT
--
create table inh_nn1 (f1 int not null no inherit);
create table inh_nn2 (f2 text, f3 int, f1 int);
alter table inh_nn2 inherit inh_nn1;
create table inh_nn3 (f4 float) inherits (inh_nn2);
create table inh_nn4 (f5 int, f4 float, f2 text, f3 int, f1 int);
alter table inh_nn4 inherit inh_nn2, inherit inh_nn1, inherit inh_nn3;
alter table inh_nn1 alter constraint inh_nn1_f1_not_null set inherit;
select conrelid::regclass, conname, conkey, coninhcount, conislocal, connoinherit
from pg_constraint where contype = 'n' and
conrelid::regclass::text in ('inh_nn1', 'inh_nn2', 'inh_nn3', 'inh_nn4')
order by 2, 1;
-- ALTER CONSTRAINT SET NO INHERIT should work on top-level constraints
alter table inh_nn1 alter constraint inh_nn1_f1_not_null set no inherit;
select conrelid::regclass, conname, conkey, coninhcount, conislocal, connoinherit
from pg_constraint where contype = 'n' and
conrelid::regclass::text in ('inh_nn1', 'inh_nn2', 'inh_nn3', 'inh_nn4')
order by 2, 1;
-- A constraint that's NO INHERIT can be dropped without damaging children
alter table inh_nn1 drop constraint inh_nn1_f1_not_null;
select conrelid::regclass, conname, coninhcount, conislocal, connoinherit
from pg_constraint where contype = 'n' and
conrelid::regclass::text in ('inh_nn1', 'inh_nn2', 'inh_nn3', 'inh_nn4')
order by 2, 1;
drop table inh_nn1, inh_nn2, inh_nn3, inh_nn4;
-- Test inherit constraint and make sure it validates.
create table inh_nn1 (f1 int not null no inherit);
create table inh_nn2 (f2 text, f3 int) inherits (inh_nn1);
insert into inh_nn2 values(NULL, 'sample', 1);
alter table inh_nn1 alter constraint inh_nn1_f1_not_null set inherit;
delete from inh_nn2;
create table inh_nn3 () inherits (inh_nn2);
create table inh_nn4 () inherits (inh_nn1, inh_nn2);
alter table inh_nn1 -- test multicommand alter table while at it
alter constraint inh_nn1_f1_not_null set inherit,
alter constraint inh_nn1_f1_not_null set no inherit;
select conrelid::regclass, conname, coninhcount, conislocal, connoinherit
from pg_constraint where contype = 'n' and
conrelid::regclass::text in ('inh_nn1', 'inh_nn2', 'inh_nn3', 'inh_nn4')
order by 2, 1;
drop table inh_nn1, inh_nn2, inh_nn3, inh_nn4;
-- Test not null inherit constraint which already exists on child table.
create table inh_nn1 (f1 int not null no inherit);
create table inh_nn2 (f2 text, f3 int) inherits (inh_nn1);
create table inh_nn3 (f4 float, constraint nn3_f1 not null f1 no inherit) inherits (inh_nn1, inh_nn2);
select conrelid::regclass, conname, conkey, coninhcount, conislocal, connoinherit
from pg_constraint where contype = 'n' and
conrelid::regclass::text in ('inh_nn1', 'inh_nn2', 'inh_nn3')
order by 2, 1;
-- error: inh_nn3 has an incompatible NO INHERIT constraint
alter table inh_nn1 alter constraint inh_nn1_f1_not_null set inherit;
alter table inh_nn3 alter constraint nn3_f1 set inherit;
alter table inh_nn1 alter constraint inh_nn1_f1_not_null set inherit; -- now it works
select conrelid::regclass, conname, conkey, coninhcount, conislocal, connoinherit
from pg_constraint where contype = 'n' and
conrelid::regclass::text in ('inh_nn1', 'inh_nn2', 'inh_nn3')
order by 2, 1;
drop table inh_nn1, inh_nn2, inh_nn3;
-- Negative scenarios for alter constraint .. set inherit.
create table inh_nn1 (f1 int check(f1 > 5) primary key references inh_nn1, f2 int not null);
-- constraints other than not-null are not supported
alter table inh_nn1 alter constraint inh_nn1_f1_check set inherit;
alter table inh_nn1 alter constraint inh_nn1_pkey set inherit;
alter table inh_nn1 alter constraint inh_nn1_f1_fkey set inherit;
-- try to drop a nonexistant constraint
alter table inh_nn1 alter constraint foo set inherit;
-- Can't modify inheritability of inherited constraints
create table inh_nn2 () inherits (inh_nn1);
alter table inh_nn2 alter constraint inh_nn1_f2_not_null set no inherit;
drop table inh_nn1, inh_nn2;
--
-- Mixed ownership inheritance tree
--