diff --git a/doc/src/sgml/ref/alter_table.sgml b/doc/src/sgml/ref/alter_table.sgml
index f9576da..59f939c 100644
--- a/doc/src/sgml/ref/alter_table.sgml
+++ b/doc/src/sgml/ref/alter_table.sgml
@@ -59,6 +59,7 @@ ALTER TABLE [ IF EXISTS ] name
ADD table_constraint [ NOT VALID ]
ADD table_constraint_using_index
ALTER CONSTRAINT constraint_name [ DEFERRABLE | NOT DEFERRABLE ] [ INITIALLY DEFERRED | INITIALLY IMMEDIATE ]
+ ALTER CONSTRAINT constraint_name SET [INHERIT | NO INHERIT]
VALIDATE CONSTRAINT constraint_name
DROP CONSTRAINT [ IF EXISTS ] constraint_name [ RESTRICT | CASCADE ]
DISABLE TRIGGER [ trigger_name | ALL | USER ]
@@ -551,11 +552,31 @@ WITH ( MODULUS numeric_literal, REM
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.
+
+ ALTER CONSTRAINT ... SET INHERIT
+ ALTER CONSTRAINT ... SET NO INHERIT
+
+
+ This form modifies 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
+ is 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.
+
+
+
+
VALIDATE CONSTRAINT
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 18f64db..fa6231a 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -391,6 +391,10 @@ static void AlterSeqNamespaces(Relation classRel, Relation rel,
LOCKMODE lockmode);
static ObjectAddress ATExecAlterConstraint(Relation rel, AlterTableCmd *cmd,
bool recurse, bool recursing, LOCKMODE lockmode);
+static ObjectAddress ATExecAlterConstraintInherit(List **wqueue, Relation rel, AlterTableCmd *cmd,
+ bool recurse, bool recursing, LOCKMODE lockmode);
+static ObjectAddress ATExecAlterConstraintNoInherit(Relation rel, AlterTableCmd *cmd,
+ LOCKMODE lockmode);
static bool ATExecAlterConstrRecurse(Constraint *cmdcon, Relation conrel, Relation tgrel,
Relation rel, HeapTuple contuple, List **otherrelids,
LOCKMODE lockmode);
@@ -476,6 +480,8 @@ static ObjectAddress ATExecSetNotNull(List **wqueue, Relation rel,
char *constrname, char *colName,
bool recurse, bool recursing,
LOCKMODE lockmode);
+static ObjectAddress ATExecSetNotNullNoInherit(Relation rel, char *conName,
+ char *colName, LOCKMODE lockmode);
static bool NotNullImpliedByRelConstraints(Relation rel, Form_pg_attribute attr);
static bool ConstraintImpliedByRelConstraint(Relation scanrel,
List *testConstraint, List *provenConstraint);
@@ -4660,6 +4666,8 @@ AlterTableGetLockLevel(List *cmds)
case AT_SetExpression:
case AT_DropExpression:
case AT_SetCompression:
+ case AT_AlterConstraintInherit:
+ case AT_AlterConstraintNoInherit:
cmd_lockmode = AccessExclusiveLock;
break;
@@ -5154,6 +5162,18 @@ ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
/* Recursion occurs during execution phase */
pass = AT_PASS_MISC;
break;
+ case AT_AlterConstraintInherit: /* ALTER CONSTRAINT SET INHERIT*/
+ ATSimplePermissions(cmd->subtype, rel,
+ ATT_TABLE | ATT_PARTITIONED_TABLE);
+ /* Recursion occurs during execution phase */
+ pass = AT_PASS_MISC;
+ break;
+ case AT_AlterConstraintNoInherit: /* ALTER CONSTRAINT SET NO INHERIT */
+ ATSimplePermissions(cmd->subtype, rel,
+ ATT_TABLE | ATT_PARTITIONED_TABLE);
+ /* Recursion occurs during execution phase */
+ pass = AT_PASS_MISC;
+ break;
case AT_ValidateConstraint: /* VALIDATE CONSTRAINT */
ATSimplePermissions(cmd->subtype, rel,
ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_FOREIGN_TABLE);
@@ -5434,6 +5454,13 @@ ATExecCmd(List **wqueue, AlteredTableInfo *tab,
case AT_AlterConstraint: /* ALTER CONSTRAINT */
address = ATExecAlterConstraint(rel, cmd, false, false, lockmode);
break;
+ case AT_AlterConstraintInherit: /* ALTER CONSTRAINT SET INHERIT */
+ address = ATExecAlterConstraintInherit(wqueue, rel, cmd,
+ true, true, lockmode);
+ break;
+ case AT_AlterConstraintNoInherit: /* ALTER CONSTRAINT SET NO INHERIT */
+ address = ATExecAlterConstraintNoInherit(rel, cmd, lockmode);
+ break;
case AT_ValidateConstraint: /* VALIDATE CONSTRAINT */
address = ATExecValidateConstraint(wqueue, rel, cmd->name, cmd->recurse,
false, lockmode);
@@ -6518,6 +6545,10 @@ alter_table_type_to_string(AlterTableType cmdtype)
return "ADD CONSTRAINT";
case AT_AlterConstraint:
return "ALTER CONSTRAINT";
+ case AT_AlterConstraintInherit:
+ return "ALTER CONSTRAINT ... SET INHERIT";
+ case AT_AlterConstraintNoInherit:
+ return "ALTER CONSTRAINT ... SET NO INHERIT";
case AT_ValidateConstraint:
return "VALIDATE CONSTRAINT";
case AT_DropConstraint:
@@ -21034,3 +21065,331 @@ GetAttributeStorage(Oid atttypid, const char *storagemode)
return cstorage;
}
+
+/*
+ * ALTER TABLE ALTER CONSTRAINT SET INHERIT
+ *
+ * Make the constraint as inherit and recurse the constraint to childrens if
+ * any.
+ *
+ * Currently only works for not null constraints.
+ *
+ * If the constraint is modified, returns its address; otherwise, return
+ * InvalidObjectAddress.
+ */
+static ObjectAddress
+ATExecAlterConstraintInherit(List **wqueue, Relation rel,
+ AlterTableCmd *cmd, bool recurse,
+ bool recursing, LOCKMODE lockmode)
+{
+ Relation conrel;
+ Relation tgrel;
+ SysScanDesc scan;
+ ScanKeyData skey[3];
+ HeapTuple contuple;
+ Form_pg_constraint currcon;
+ ObjectAddress address = InvalidObjectAddress;
+ AttrNumber colNum;
+ char *colName;
+ List *children;
+
+ conrel = table_open(ConstraintRelationId, RowExclusiveLock);
+ tgrel = table_open(TriggerRelationId, RowExclusiveLock);
+
+ /*
+ * Find and check the target constraint
+ */
+ ScanKeyInit(&skey[0],
+ Anum_pg_constraint_conrelid,
+ BTEqualStrategyNumber, F_OIDEQ,
+ ObjectIdGetDatum(RelationGetRelid(rel)));
+ ScanKeyInit(&skey[1],
+ Anum_pg_constraint_contypid,
+ BTEqualStrategyNumber, F_OIDEQ,
+ ObjectIdGetDatum(InvalidOid));
+ ScanKeyInit(&skey[2],
+ Anum_pg_constraint_conname,
+ BTEqualStrategyNumber, F_NAMEEQ,
+ CStringGetDatum(cmd->name));
+ scan = systable_beginscan(conrel, ConstraintRelidTypidNameIndexId,
+ true, NULL, 3, skey);
+
+ /* There can be at most one matching row */
+ if (!HeapTupleIsValid(contuple = systable_getnext(scan)))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_OBJECT),
+ errmsg("constraint \"%s\" of relation \"%s\" does not exist",
+ cmd->name, RelationGetRelationName(rel))));
+
+ contuple = heap_copytuple(contuple);
+
+ currcon = (Form_pg_constraint) GETSTRUCT(contuple);
+
+ if (currcon->contype != CONSTRAINT_NOTNULL)
+ ereport(ERROR,
+ (errcode(ERRCODE_WRONG_OBJECT_TYPE),
+ errmsg("ALTER TABLE \"%s\" ALTER CONSTRAINT \"%s\" SET INHERIT only supports not null constraint",
+ RelationGetRelationName(rel), cmd->name)));
+
+ /* Return if constraint is already marked as INHERIT. */
+ if (!currcon->connoinherit)
+ {
+ systable_endscan(scan);
+
+ table_close(tgrel, RowExclusiveLock);
+ table_close(conrel, RowExclusiveLock);
+ heap_freetuple(contuple);
+
+ return address;
+ }
+
+ /* Update the constraint tuple and mark connoinherit as false. */
+ currcon->connoinherit = false;
+
+ CatalogTupleUpdate(conrel, &contuple->t_self, contuple);
+ ObjectAddressSet(address, ConstraintRelationId, currcon->oid);
+ CommandCounterIncrement();
+
+ systable_endscan(scan);
+
+ table_close(tgrel, RowExclusiveLock);
+ table_close(conrel, RowExclusiveLock);
+
+ /* fetch the column number and name */
+ colNum = extractNotNullColumn(contuple);
+ colName = get_attname(currcon->conrelid, colNum, false);
+
+ /*
+ * Recurse to propagate the constraint to children that don't have one.
+ */
+ children = find_inheritance_children(RelationGetRelid(rel),
+ lockmode);
+
+ foreach_oid(childoid, children)
+ {
+ Relation childrel = table_open(childoid, NoLock);
+ ObjectAddress addr;
+
+ addr = ATExecSetNotNull(wqueue, childrel, NameStr(currcon->conname),
+ colName, recurse, recursing, lockmode);
+ if (OidIsValid(addr.objectId))
+ CommandCounterIncrement();
+
+ table_close(childrel, NoLock);
+ }
+
+ heap_freetuple(contuple);
+
+ return address;
+}
+
+
+/*
+ * ALTER TABLE ALTER CONSTRAINT SET NO INHERIT
+ *
+ * Make the constraint as inherit and recurse to the childrens and decrement
+ * their inheritance count.
+ *
+ * Currently only works for not null constraints.
+ *
+ * If the constraint is modified, returns its address; otherwise, return
+ * InvalidObjectAddress.
+ */
+static ObjectAddress
+ATExecAlterConstraintNoInherit(Relation rel, AlterTableCmd *cmd,
+ LOCKMODE lockmode)
+{
+ Relation conrel;
+ Relation tgrel;
+ SysScanDesc scan;
+ ScanKeyData skey[3];
+ HeapTuple contuple;
+ Form_pg_constraint currcon;
+ ObjectAddress address = InvalidObjectAddress;
+ AttrNumber colNum;
+ char *colName;
+ List *children;
+
+ conrel = table_open(ConstraintRelationId, RowExclusiveLock);
+ tgrel = table_open(TriggerRelationId, RowExclusiveLock);
+
+ /*
+ * Find and check the target constraint
+ */
+ ScanKeyInit(&skey[0],
+ Anum_pg_constraint_conrelid,
+ BTEqualStrategyNumber, F_OIDEQ,
+ ObjectIdGetDatum(RelationGetRelid(rel)));
+ ScanKeyInit(&skey[1],
+ Anum_pg_constraint_contypid,
+ BTEqualStrategyNumber, F_OIDEQ,
+ ObjectIdGetDatum(InvalidOid));
+ ScanKeyInit(&skey[2],
+ Anum_pg_constraint_conname,
+ BTEqualStrategyNumber, F_NAMEEQ,
+ CStringGetDatum(cmd->name));
+ scan = systable_beginscan(conrel, ConstraintRelidTypidNameIndexId,
+ true, NULL, 3, skey);
+
+ /* There can be at most one matching row */
+ if (!HeapTupleIsValid(contuple = systable_getnext(scan)))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_OBJECT),
+ errmsg("constraint \"%s\" of relation \"%s\" does not exist",
+ cmd->name, RelationGetRelationName(rel))));
+
+ contuple = heap_copytuple(contuple);
+
+ currcon = (Form_pg_constraint) GETSTRUCT(contuple);
+
+ if (currcon->contype != CONSTRAINT_NOTNULL)
+ ereport(ERROR,
+ (errcode(ERRCODE_WRONG_OBJECT_TYPE),
+ errmsg("ALTER TABLE \"%s\" ALTER CONSTRAINT \"%s\" SET NO INHERIT only supports not null constraint",
+ RelationGetRelationName(rel), cmd->name)));
+
+ /* Return if constraint is already marked as NO INHERIT. */
+ if (currcon->connoinherit)
+ {
+ systable_endscan(scan);
+
+ table_close(tgrel, RowExclusiveLock);
+ table_close(conrel, RowExclusiveLock);
+ heap_freetuple(contuple);
+
+ return address;
+ }
+
+ /* Update the constraint tuple and mark connoinherit as true. */
+ currcon->connoinherit = true;
+
+ CatalogTupleUpdate(conrel, &contuple->t_self, contuple);
+ ObjectAddressSet(address, ConstraintRelationId, currcon->oid);
+ CommandCounterIncrement();
+
+ systable_endscan(scan);
+
+ table_close(tgrel, RowExclusiveLock);
+ table_close(conrel, RowExclusiveLock);
+
+ /* fetch the column number and name */
+ colNum = extractNotNullColumn(contuple);
+ colName = get_attname(currcon->conrelid, colNum, false);
+
+ /*
+ * Recurse to propagate the constraint to children that don't have one.
+ */
+ children = find_inheritance_children(RelationGetRelid(rel),
+ lockmode);
+
+ foreach_oid(childoid, children)
+ {
+ Relation childrel = table_open(childoid, NoLock);
+
+ ATExecSetNotNullNoInherit(childrel, NameStr(currcon->conname),
+ colName, lockmode);
+
+ table_close(childrel, NoLock);
+ }
+
+ heap_freetuple(contuple);
+
+ return address;
+}
+
+/*
+ * Find out the not null constraint from provided relation and decrement the
+ * coninhcount count if constraint exists since the parent constraint marked as
+ * no inherit.
+ *
+ * We must recurse to child tables during execution.
+ */
+static ObjectAddress
+ATExecSetNotNullNoInherit(Relation rel, char *conName,
+ char *colName, LOCKMODE lockmode)
+{
+
+ HeapTuple tuple;
+ AttrNumber attnum;
+ ObjectAddress address;
+ List *children;
+
+ /* Guard against stack overflow due to overly deep inheritance tree. */
+ check_stack_depth();
+
+ ATSimplePermissions(AT_AddConstraint, rel,
+ ATT_PARTITIONED_TABLE | ATT_TABLE | ATT_FOREIGN_TABLE);
+
+ attnum = get_attnum(RelationGetRelid(rel), colName);
+ if (attnum == InvalidAttrNumber)
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_COLUMN),
+ errmsg("column \"%s\" of relation \"%s\" does not exist",
+ colName, RelationGetRelationName(rel))));
+
+ /* Prevent them from altering a system attribute */
+ if (attnum <= 0)
+ ereport(ERROR,
+ (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+ errmsg("cannot alter system column \"%s\"",
+ colName)));
+
+ /* See if there's already a constraint */
+ tuple = findNotNullConstraintAttnum(RelationGetRelid(rel), attnum);
+ if (HeapTupleIsValid(tuple))
+ {
+ Form_pg_constraint conForm = (Form_pg_constraint) GETSTRUCT(tuple);
+ bool changed = false;
+
+ /* Decrement the constraint inheritance count */
+ if (conForm->coninhcount > 0)
+ {
+ conForm->coninhcount--;
+ changed = true;
+ }
+ /* Mark the constraint as local defined once coninhcount = 0 */
+ if (conForm->coninhcount == 0)
+ {
+ conForm->conislocal = true;
+ changed = true;
+ }
+
+ if (changed)
+ {
+ Relation constr_rel;
+
+ constr_rel = table_open(ConstraintRelationId, RowExclusiveLock);
+
+ CatalogTupleUpdate(constr_rel, &tuple->t_self, tuple);
+ ObjectAddressSet(address, ConstraintRelationId, conForm->oid);
+ table_close(constr_rel, RowExclusiveLock);
+
+ /* Make update visible */
+ CommandCounterIncrement();
+ }
+ }
+ else
+ elog(ERROR, "cache lookup failed for not-null constraint on column \"%s\" of relation %u",
+ colName, RelationGetRelid(rel));
+
+ if (tuple)
+ heap_freetuple(tuple);
+
+ InvokeObjectPostAlterHook(RelationRelationId,
+ RelationGetRelid(rel), attnum);
+
+ /*
+ * Recurse to child tables.
+ */
+ children = find_inheritance_children(RelationGetRelid(rel), lockmode);
+
+ foreach_oid(childoid, children)
+ {
+ Relation childrel = table_open(childoid, NoLock);
+
+ ATExecSetNotNullNoInherit(childrel, conName, colName, lockmode);
+ table_close(childrel, NoLock);
+ }
+
+ return address;
+}
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index d7f9c00..d96989a 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -2669,6 +2669,26 @@ alter_table_cmd:
NULL, NULL, NULL, yyscanner);
$$ = (Node *) n;
}
+ /* ALTER TABLE ALTER CONSTRAINT INHERIT */
+ | ALTER CONSTRAINT name SET INHERIT
+ {
+ AlterTableCmd *n = makeNode(AlterTableCmd);
+
+ n->subtype = AT_AlterConstraintInherit;
+ n->name = $3;
+
+ $$ = (Node *) n;
+ }
+ /* ALTER TABLE ALTER CONSTRAINT SET NO INHERIT */
+ | ALTER CONSTRAINT name SET NO INHERIT
+ {
+ AlterTableCmd *n = makeNode(AlterTableCmd);
+
+ n->subtype = AT_AlterConstraintNoInherit;
+ n->name = $3;
+
+ $$ = (Node *) n;
+ }
/* ALTER TABLE VALIDATE CONSTRAINT ... */
| VALIDATE CONSTRAINT name
{
diff --git a/src/include/nodes/parsenodes.h b/src/include/nodes/parsenodes.h
index ffe155e..6ba542b 100644
--- a/src/include/nodes/parsenodes.h
+++ b/src/include/nodes/parsenodes.h
@@ -2467,6 +2467,8 @@ typedef enum AlterTableType
AT_SetIdentity, /* SET identity column options */
AT_DropIdentity, /* DROP IDENTITY */
AT_ReAddStatistics, /* internal to commands/tablecmds.c */
+ AT_AlterConstraintInherit, /* alter constraint set inherit */
+ AT_AlterConstraintNoInherit, /* alter constraint set no inherit */
} AlterTableType;
typedef struct ReplicaIdentityStmt
diff --git a/src/test/modules/test_ddl_deparse/test_ddl_deparse.c b/src/test/modules/test_ddl_deparse/test_ddl_deparse.c
index 193669f..46281ec 100644
--- a/src/test/modules/test_ddl_deparse/test_ddl_deparse.c
+++ b/src/test/modules/test_ddl_deparse/test_ddl_deparse.c
@@ -168,6 +168,8 @@ get_altertable_subcmdinfo(PG_FUNCTION_ARGS)
strtype = "(re) ADD DOMAIN CONSTRAINT";
break;
case AT_AlterConstraint:
+ case AT_AlterConstraintInherit:
+ case AT_AlterConstraintNoInherit:
strtype = "ALTER CONSTRAINT";
break;
case AT_ValidateConstraint:
diff --git a/src/test/regress/expected/inherit.out b/src/test/regress/expected/inherit.out
index dbf3835..2d76aba 100644
--- a/src/test/regress/expected/inherit.out
+++ b/src/test/regress/expected/inherit.out
@@ -2744,6 +2744,587 @@ NOTICE: drop cascades to 2 other objects
DETAIL: drop cascades to table inh_multiparent
drop cascades to table inh_multiparent2
--
+-- Test - alter constraint inherit/no inherit for not null.
+--
+create table part1 (f1 int not null no inherit);
+create table ch1 (f2 text, f3 int) inherits (part1);
+create table ch2 (f4 float) inherits (part1, ch1);
+NOTICE: merging multiple inherited definitions of column "f1"
+create table ch3 () inherits (part1, ch1, ch2);
+NOTICE: merging multiple inherited definitions of column "f1"
+NOTICE: merging multiple inherited definitions of column "f1"
+NOTICE: merging multiple inherited definitions of column "f2"
+NOTICE: merging multiple inherited definitions of column "f3"
+alter table part1 alter constraint part1_f1_not_null set inherit;
+select conrelid::regclass, conname, contype, coninhcount, conislocal
+ from pg_constraint where contype = 'n' and
+ conrelid::regclass::text in ('part1', 'ch1', 'ch2', 'ch3')
+ order by 2, 1;
+ conrelid | conname | contype | coninhcount | conislocal
+----------+-------------------+---------+-------------+------------
+ part1 | part1_f1_not_null | n | 0 | t
+ ch1 | part1_f1_not_null | n | 1 | f
+ ch2 | part1_f1_not_null | n | 2 | f
+ ch3 | part1_f1_not_null | n | 3 | f
+(4 rows)
+
+\d+ ch1
+ Table "public.ch1"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+---------+-----------+----------+---------+----------+--------------+-------------
+ f1 | integer | | not null | | plain | |
+ f2 | text | | | | extended | |
+ f3 | integer | | | | plain | |
+Not-null constraints:
+ "part1_f1_not_null" NOT NULL "f1" (inherited)
+Inherits: part1
+Child tables: ch2,
+ ch3
+
+\d+ ch2
+ Table "public.ch2"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+------------------+-----------+----------+---------+----------+--------------+-------------
+ f1 | integer | | not null | | plain | |
+ f2 | text | | | | extended | |
+ f3 | integer | | | | plain | |
+ f4 | double precision | | | | plain | |
+Not-null constraints:
+ "part1_f1_not_null" NOT NULL "f1" (inherited)
+Inherits: part1,
+ ch1
+Child tables: ch3
+
+\d+ ch3
+ Table "public.ch3"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+------------------+-----------+----------+---------+----------+--------------+-------------
+ f1 | integer | | not null | | plain | |
+ f2 | text | | | | extended | |
+ f3 | integer | | | | plain | |
+ f4 | double precision | | | | plain | |
+Not-null constraints:
+ "part1_f1_not_null" NOT NULL "f1" (inherited)
+Inherits: part1,
+ ch1,
+ ch2
+
+alter table part1 alter constraint part1_f1_not_null set no inherit;
+select conrelid::regclass, conname, contype, coninhcount, conislocal
+ from pg_constraint where contype = 'n' and
+ conrelid::regclass::text in ('part1', 'ch1', 'ch2', 'ch3')
+ order by 2, 1;
+ conrelid | conname | contype | coninhcount | conislocal
+----------+-------------------+---------+-------------+------------
+ part1 | part1_f1_not_null | n | 0 | t
+ ch1 | part1_f1_not_null | n | 0 | t
+ ch2 | part1_f1_not_null | n | 0 | t
+ ch3 | part1_f1_not_null | n | 0 | t
+(4 rows)
+
+\d+ ch1
+ Table "public.ch1"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+---------+-----------+----------+---------+----------+--------------+-------------
+ f1 | integer | | not null | | plain | |
+ f2 | text | | | | extended | |
+ f3 | integer | | | | plain | |
+Not-null constraints:
+ "part1_f1_not_null" NOT NULL "f1"
+Inherits: part1
+Child tables: ch2,
+ ch3
+
+\d+ ch2
+ Table "public.ch2"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+------------------+-----------+----------+---------+----------+--------------+-------------
+ f1 | integer | | not null | | plain | |
+ f2 | text | | | | extended | |
+ f3 | integer | | | | plain | |
+ f4 | double precision | | | | plain | |
+Not-null constraints:
+ "part1_f1_not_null" NOT NULL "f1"
+Inherits: part1,
+ ch1
+Child tables: ch3
+
+\d+ ch3
+ Table "public.ch3"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+------------------+-----------+----------+---------+----------+--------------+-------------
+ f1 | integer | | not null | | plain | |
+ f2 | text | | | | extended | |
+ f3 | integer | | | | plain | |
+ f4 | double precision | | | | plain | |
+Not-null constraints:
+ "part1_f1_not_null" NOT NULL "f1"
+Inherits: part1,
+ ch1,
+ ch2
+
+drop table part1 cascade;
+NOTICE: drop cascades to 3 other objects
+DETAIL: drop cascades to table ch1
+drop cascades to table ch2
+drop cascades to table ch3
+-- Test inherit constraint and make sure it validates.
+create table part1 (f1 int not null no inherit);
+create table ch1 (f2 text, f3 int) inherits (part1);
+create table ch2 (f4 float) inherits (part1, ch1);
+NOTICE: merging multiple inherited definitions of column "f1"
+create table ch3 () inherits (part1, ch1, ch2);
+NOTICE: merging multiple inherited definitions of column "f1"
+NOTICE: merging multiple inherited definitions of column "f1"
+NOTICE: merging multiple inherited definitions of column "f2"
+NOTICE: merging multiple inherited definitions of column "f3"
+insert into ch1 values(NULL, 'sample', 1);
+alter table part1 alter constraint part1_f1_not_null set inherit;
+ERROR: column "f1" of relation "ch1" contains null values
+delete from ch1;
+alter table part1 alter constraint part1_f1_not_null set inherit;
+select conrelid::regclass, conname, contype, coninhcount, conislocal
+ from pg_constraint where contype = 'n' and
+ conrelid::regclass::text in ('part1', 'ch1', 'ch2', 'ch3')
+ order by 2, 1;
+ conrelid | conname | contype | coninhcount | conislocal
+----------+-------------------+---------+-------------+------------
+ part1 | part1_f1_not_null | n | 0 | t
+ ch1 | part1_f1_not_null | n | 1 | f
+ ch2 | part1_f1_not_null | n | 2 | f
+ ch3 | part1_f1_not_null | n | 3 | f
+(4 rows)
+
+\d+ ch1
+ Table "public.ch1"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+---------+-----------+----------+---------+----------+--------------+-------------
+ f1 | integer | | not null | | plain | |
+ f2 | text | | | | extended | |
+ f3 | integer | | | | plain | |
+Not-null constraints:
+ "part1_f1_not_null" NOT NULL "f1" (inherited)
+Inherits: part1
+Child tables: ch2,
+ ch3
+
+\d+ ch2
+ Table "public.ch2"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+------------------+-----------+----------+---------+----------+--------------+-------------
+ f1 | integer | | not null | | plain | |
+ f2 | text | | | | extended | |
+ f3 | integer | | | | plain | |
+ f4 | double precision | | | | plain | |
+Not-null constraints:
+ "part1_f1_not_null" NOT NULL "f1" (inherited)
+Inherits: part1,
+ ch1
+Child tables: ch3
+
+\d+ ch3
+ Table "public.ch3"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+------------------+-----------+----------+---------+----------+--------------+-------------
+ f1 | integer | | not null | | plain | |
+ f2 | text | | | | extended | |
+ f3 | integer | | | | plain | |
+ f4 | double precision | | | | plain | |
+Not-null constraints:
+ "part1_f1_not_null" NOT NULL "f1" (inherited)
+Inherits: part1,
+ ch1,
+ ch2
+
+drop table part1 cascade;
+NOTICE: drop cascades to 3 other objects
+DETAIL: drop cascades to table ch1
+drop cascades to table ch2
+drop cascades to table ch3
+-- Test not null inherit constraint which already exists on child table.
+create table part1 (f1 int not null no inherit);
+create table ch1 (f2 text, f3 int) inherits (part1);
+create table ch2 (f4 float) inherits (part1, ch1);
+NOTICE: merging multiple inherited definitions of column "f1"
+alter table ch1 alter f1 set not null;
+\d+ ch1
+ Table "public.ch1"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+---------+-----------+----------+---------+----------+--------------+-------------
+ f1 | integer | | not null | | plain | |
+ f2 | text | | | | extended | |
+ f3 | integer | | | | plain | |
+Not-null constraints:
+ "ch1_f1_not_null" NOT NULL "f1"
+Inherits: part1
+Child tables: ch2
+
+alter table part1 alter constraint part1_f1_not_null set inherit;
+select conrelid::regclass, conname, contype, coninhcount, conislocal
+ from pg_constraint where contype = 'n' and
+ conrelid::regclass::text in ('part1', 'ch1', 'ch2')
+ order by 2, 1;
+ conrelid | conname | contype | coninhcount | conislocal
+----------+-------------------+---------+-------------+------------
+ ch1 | ch1_f1_not_null | n | 1 | t
+ ch2 | ch1_f1_not_null | n | 2 | f
+ part1 | part1_f1_not_null | n | 0 | t
+(3 rows)
+
+\d+ ch1
+ Table "public.ch1"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+---------+-----------+----------+---------+----------+--------------+-------------
+ f1 | integer | | not null | | plain | |
+ f2 | text | | | | extended | |
+ f3 | integer | | | | plain | |
+Not-null constraints:
+ "ch1_f1_not_null" NOT NULL "f1" (local, inherited)
+Inherits: part1
+Child tables: ch2
+
+\d+ ch2
+ Table "public.ch2"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+------------------+-----------+----------+---------+----------+--------------+-------------
+ f1 | integer | | not null | | plain | |
+ f2 | text | | | | extended | |
+ f3 | integer | | | | plain | |
+ f4 | double precision | | | | plain | |
+Not-null constraints:
+ "ch1_f1_not_null" NOT NULL "f1" (inherited)
+Inherits: part1,
+ ch1
+
+drop table part1 cascade;
+NOTICE: drop cascades to 2 other objects
+DETAIL: drop cascades to table ch1
+drop cascades to table ch2
+create table part1 (f1 int not null no inherit);
+create table ch1 (f2 text, f3 int not null no inherit) inherits (part1);
+create table ch2 (f4 float) inherits (part1, ch1);
+NOTICE: merging multiple inherited definitions of column "f1"
+alter table ch1 alter constraint ch1_f3_not_null set inherit;
+create table ch3 () inherits (part1, ch1, ch2);
+NOTICE: merging multiple inherited definitions of column "f1"
+NOTICE: merging multiple inherited definitions of column "f1"
+NOTICE: merging multiple inherited definitions of column "f2"
+NOTICE: merging multiple inherited definitions of column "f3"
+select conrelid::regclass, conname, contype, coninhcount, conislocal
+ from pg_constraint where contype = 'n' and
+ conrelid::regclass::text in ('part1', 'ch1', 'ch2', 'ch3')
+ order by 2, 1;
+ conrelid | conname | contype | coninhcount | conislocal
+----------+-------------------+---------+-------------+------------
+ ch1 | ch1_f3_not_null | n | 0 | t
+ ch2 | ch1_f3_not_null | n | 1 | f
+ ch3 | ch1_f3_not_null | n | 2 | f
+ part1 | part1_f1_not_null | n | 0 | t
+(4 rows)
+
+\d+ ch1
+ Table "public.ch1"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+---------+-----------+----------+---------+----------+--------------+-------------
+ f1 | integer | | | | plain | |
+ f2 | text | | | | extended | |
+ f3 | integer | | not null | | plain | |
+Not-null constraints:
+ "ch1_f3_not_null" NOT NULL "f3"
+Inherits: part1
+Child tables: ch2,
+ ch3
+
+\d+ ch2
+ Table "public.ch2"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+------------------+-----------+----------+---------+----------+--------------+-------------
+ f1 | integer | | | | plain | |
+ f2 | text | | | | extended | |
+ f3 | integer | | not null | | plain | |
+ f4 | double precision | | | | plain | |
+Not-null constraints:
+ "ch1_f3_not_null" NOT NULL "f3" (inherited)
+Inherits: part1,
+ ch1
+Child tables: ch3
+
+\d+ ch3
+ Table "public.ch3"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+------------------+-----------+----------+---------+----------+--------------+-------------
+ f1 | integer | | | | plain | |
+ f2 | text | | | | extended | |
+ f3 | integer | | not null | | plain | |
+ f4 | double precision | | | | plain | |
+Not-null constraints:
+ "ch1_f3_not_null" NOT NULL "f3" (inherited)
+Inherits: part1,
+ ch1,
+ ch2
+
+drop table part1 cascade;
+NOTICE: drop cascades to 3 other objects
+DETAIL: drop cascades to table ch1
+drop cascades to table ch2
+drop cascades to table ch3
+-- Multilevel inheritance.
+create table part1 (f1 int not null no inherit);
+create table ch1 (f2 text, f3 int) inherits (part1);
+create table ch2 (f4 float) inherits (ch1);
+create table ch3 () inherits (ch2);
+alter table part1 alter constraint part1_f1_not_null set inherit;
+select conrelid::regclass, conname, contype, coninhcount, conislocal
+ from pg_constraint where contype = 'n' and
+ conrelid::regclass::text in ('part1', 'ch1', 'ch2', 'ch3')
+ order by 2, 1;
+ conrelid | conname | contype | coninhcount | conislocal
+----------+-------------------+---------+-------------+------------
+ part1 | part1_f1_not_null | n | 0 | t
+ ch1 | part1_f1_not_null | n | 1 | f
+ ch2 | part1_f1_not_null | n | 1 | f
+ ch3 | part1_f1_not_null | n | 1 | f
+(4 rows)
+
+\d+ ch1
+ Table "public.ch1"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+---------+-----------+----------+---------+----------+--------------+-------------
+ f1 | integer | | not null | | plain | |
+ f2 | text | | | | extended | |
+ f3 | integer | | | | plain | |
+Not-null constraints:
+ "part1_f1_not_null" NOT NULL "f1" (inherited)
+Inherits: part1
+Child tables: ch2
+
+\d+ ch2
+ Table "public.ch2"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+------------------+-----------+----------+---------+----------+--------------+-------------
+ f1 | integer | | not null | | plain | |
+ f2 | text | | | | extended | |
+ f3 | integer | | | | plain | |
+ f4 | double precision | | | | plain | |
+Not-null constraints:
+ "part1_f1_not_null" NOT NULL "f1" (inherited)
+Inherits: ch1
+Child tables: ch3
+
+\d+ ch3
+ Table "public.ch3"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+------------------+-----------+----------+---------+----------+--------------+-------------
+ f1 | integer | | not null | | plain | |
+ f2 | text | | | | extended | |
+ f3 | integer | | | | plain | |
+ f4 | double precision | | | | plain | |
+Not-null constraints:
+ "part1_f1_not_null" NOT NULL "f1" (inherited)
+Inherits: ch2
+
+-- Test no inherit.
+alter table part1 alter constraint part1_f1_not_null set no inherit;
+select conrelid::regclass, conname, contype, coninhcount, conislocal
+ from pg_constraint where contype = 'n' and
+ conrelid::regclass::text in ('part1', 'ch1', 'ch2', 'ch3')
+ order by 2, 1;
+ conrelid | conname | contype | coninhcount | conislocal
+----------+-------------------+---------+-------------+------------
+ part1 | part1_f1_not_null | n | 0 | t
+ ch1 | part1_f1_not_null | n | 0 | t
+ ch2 | part1_f1_not_null | n | 0 | t
+ ch3 | part1_f1_not_null | n | 0 | t
+(4 rows)
+
+\d+ ch1
+ Table "public.ch1"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+---------+-----------+----------+---------+----------+--------------+-------------
+ f1 | integer | | not null | | plain | |
+ f2 | text | | | | extended | |
+ f3 | integer | | | | plain | |
+Not-null constraints:
+ "part1_f1_not_null" NOT NULL "f1"
+Inherits: part1
+Child tables: ch2
+
+\d+ ch2
+ Table "public.ch2"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+------------------+-----------+----------+---------+----------+--------------+-------------
+ f1 | integer | | not null | | plain | |
+ f2 | text | | | | extended | |
+ f3 | integer | | | | plain | |
+ f4 | double precision | | | | plain | |
+Not-null constraints:
+ "part1_f1_not_null" NOT NULL "f1"
+Inherits: ch1
+Child tables: ch3
+
+\d+ ch3
+ Table "public.ch3"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+------------------+-----------+----------+---------+----------+--------------+-------------
+ f1 | integer | | not null | | plain | |
+ f2 | text | | | | extended | |
+ f3 | integer | | | | plain | |
+ f4 | double precision | | | | plain | |
+Not-null constraints:
+ "part1_f1_not_null" NOT NULL "f1"
+Inherits: ch2
+
+drop table part1 cascade;
+NOTICE: drop cascades to 3 other objects
+DETAIL: drop cascades to table ch1
+drop cascades to table ch2
+drop cascades to table ch3
+-- If existing behavior is INHERIT.
+create table part1 (f1 int not null);
+create table ch1 (f2 text, f3 int) inherits (part1);
+create table ch2 (f4 float) inherits (ch1);
+create table ch3 () inherits (ch2);
+select conrelid::regclass, conname, contype, coninhcount, conislocal
+ from pg_constraint where contype = 'n' and
+ conrelid::regclass::text in ('part1', 'ch1', 'ch2', 'ch3')
+ order by 2, 1;
+ conrelid | conname | contype | coninhcount | conislocal
+----------+-------------------+---------+-------------+------------
+ part1 | part1_f1_not_null | n | 0 | t
+ ch1 | part1_f1_not_null | n | 1 | f
+ ch2 | part1_f1_not_null | n | 1 | f
+ ch3 | part1_f1_not_null | n | 1 | f
+(4 rows)
+
+alter table part1 alter constraint part1_f1_not_null set inherit;
+select conrelid::regclass, conname, contype, coninhcount, conislocal
+ from pg_constraint where contype = 'n' and
+ conrelid::regclass::text in ('part1', 'ch1', 'ch2', 'ch3')
+ order by 2, 1;
+ conrelid | conname | contype | coninhcount | conislocal
+----------+-------------------+---------+-------------+------------
+ part1 | part1_f1_not_null | n | 0 | t
+ ch1 | part1_f1_not_null | n | 1 | f
+ ch2 | part1_f1_not_null | n | 1 | f
+ ch3 | part1_f1_not_null | n | 1 | f
+(4 rows)
+
+-- Set to no inherit.
+alter table part1 alter constraint part1_f1_not_null set no inherit;
+select conrelid::regclass, conname, contype, coninhcount, conislocal
+ from pg_constraint where contype = 'n' and
+ conrelid::regclass::text in ('part1', 'ch1', 'ch2', 'ch3')
+ order by 2, 1;
+ conrelid | conname | contype | coninhcount | conislocal
+----------+-------------------+---------+-------------+------------
+ part1 | part1_f1_not_null | n | 0 | t
+ ch1 | part1_f1_not_null | n | 0 | t
+ ch2 | part1_f1_not_null | n | 0 | t
+ ch3 | part1_f1_not_null | n | 0 | t
+(4 rows)
+
+drop table part1 cascade;
+NOTICE: drop cascades to 3 other objects
+DETAIL: drop cascades to table ch1
+drop cascades to table ch2
+drop cascades to table ch3
+-- Test no inherit when child has inherited constraint from multiple parents.
+create table part1 (f1 int not null);
+create table ch1 (f2 text, f3 int) inherits (part1);
+create table ch2 (f4 float) inherits (part1, ch1);
+NOTICE: merging multiple inherited definitions of column "f1"
+create table ch3 () inherits (part1, ch1, ch2);
+NOTICE: merging multiple inherited definitions of column "f1"
+NOTICE: merging multiple inherited definitions of column "f1"
+NOTICE: merging multiple inherited definitions of column "f2"
+NOTICE: merging multiple inherited definitions of column "f3"
+create table part2(f1 int not null);
+alter table ch2 inherit part2;
+select conrelid::regclass, conname, contype, coninhcount, conislocal
+ from pg_constraint where contype = 'n' and
+ conrelid::regclass::text in ('part1', 'ch1', 'ch2', 'ch3')
+ order by 2, 1;
+ conrelid | conname | contype | coninhcount | conislocal
+----------+-------------------+---------+-------------+------------
+ part1 | part1_f1_not_null | n | 0 | t
+ ch1 | part1_f1_not_null | n | 1 | f
+ ch2 | part1_f1_not_null | n | 3 | f
+ ch3 | part1_f1_not_null | n | 3 | f
+(4 rows)
+
+alter table part1 alter constraint part1_f1_not_null set no inherit;
+select conrelid::regclass, conname, contype, coninhcount, conislocal
+ from pg_constraint where contype = 'n' and
+ conrelid::regclass::text in ('part1', 'ch1', 'ch2', 'ch3')
+ order by 2, 1;
+ conrelid | conname | contype | coninhcount | conislocal
+----------+-------------------+---------+-------------+------------
+ part1 | part1_f1_not_null | n | 0 | t
+ ch1 | part1_f1_not_null | n | 0 | t
+ ch2 | part1_f1_not_null | n | 1 | f
+ ch3 | part1_f1_not_null | n | 0 | t
+(4 rows)
+
+\d+ ch1
+ Table "public.ch1"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+---------+-----------+----------+---------+----------+--------------+-------------
+ f1 | integer | | not null | | plain | |
+ f2 | text | | | | extended | |
+ f3 | integer | | | | plain | |
+Not-null constraints:
+ "part1_f1_not_null" NOT NULL "f1"
+Inherits: part1
+Child tables: ch2,
+ ch3
+
+\d+ ch2
+ Table "public.ch2"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+------------------+-----------+----------+---------+----------+--------------+-------------
+ f1 | integer | | not null | | plain | |
+ f2 | text | | | | extended | |
+ f3 | integer | | | | plain | |
+ f4 | double precision | | | | plain | |
+Not-null constraints:
+ "part1_f1_not_null" NOT NULL "f1" (inherited)
+Inherits: part1,
+ ch1,
+ part2
+Child tables: ch3
+
+\d+ ch3
+ Table "public.ch3"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+------------------+-----------+----------+---------+----------+--------------+-------------
+ f1 | integer | | not null | | plain | |
+ f2 | text | | | | extended | |
+ f3 | integer | | | | plain | |
+ f4 | double precision | | | | plain | |
+Not-null constraints:
+ "part1_f1_not_null" NOT NULL "f1"
+Inherits: part1,
+ ch1,
+ ch2
+
+drop table part1 cascade;
+NOTICE: drop cascades to 3 other objects
+DETAIL: drop cascades to table ch1
+drop cascades to table ch2
+drop cascades to table ch3
+drop table part2 cascade;
+-- Negative scenarios for alter constraint .. set inherit.
+-- Other than not null constraints are not allowed to inherit.
+create table part1 (f1 int check(f1 > 5));
+alter table part1 alter constraint part1_f1_check set inherit;
+ERROR: ALTER TABLE "part1" ALTER CONSTRAINT "part1_f1_check" SET INHERIT only supports not null constraint
+drop table part1;
+-- error out when provided not null constarint does not exists.
+create table part1(f1 int not null no inherit);
+alter table part1 alter constraint foo set inherit;
+ERROR: constraint "foo" of relation "part1" does not exist
+drop table part1;
+--
-- Mixed ownership inheritance tree
--
create role regress_alice;
diff --git a/src/test/regress/sql/inherit.sql b/src/test/regress/sql/inherit.sql
index 49aae42..a4e7cb7 100644
--- a/src/test/regress/sql/inherit.sql
+++ b/src/test/regress/sql/inherit.sql
@@ -1091,6 +1091,167 @@ select conrelid::regclass, contype, conname,
drop table inh_p1, inh_p2, inh_p3, inh_p4 cascade;
--
+-- Test - alter constraint inherit/no inherit for not null.
+--
+create table part1 (f1 int not null no inherit);
+create table ch1 (f2 text, f3 int) inherits (part1);
+create table ch2 (f4 float) inherits (part1, ch1);
+create table ch3 () inherits (part1, ch1, ch2);
+alter table part1 alter constraint part1_f1_not_null set inherit;
+select conrelid::regclass, conname, contype, coninhcount, conislocal
+ from pg_constraint where contype = 'n' and
+ conrelid::regclass::text in ('part1', 'ch1', 'ch2', 'ch3')
+ order by 2, 1;
+\d+ ch1
+\d+ ch2
+\d+ ch3
+
+alter table part1 alter constraint part1_f1_not_null set no inherit;
+select conrelid::regclass, conname, contype, coninhcount, conislocal
+ from pg_constraint where contype = 'n' and
+ conrelid::regclass::text in ('part1', 'ch1', 'ch2', 'ch3')
+ order by 2, 1;
+\d+ ch1
+\d+ ch2
+\d+ ch3
+
+drop table part1 cascade;
+
+-- Test inherit constraint and make sure it validates.
+create table part1 (f1 int not null no inherit);
+create table ch1 (f2 text, f3 int) inherits (part1);
+create table ch2 (f4 float) inherits (part1, ch1);
+create table ch3 () inherits (part1, ch1, ch2);
+insert into ch1 values(NULL, 'sample', 1);
+alter table part1 alter constraint part1_f1_not_null set inherit;
+delete from ch1;
+alter table part1 alter constraint part1_f1_not_null set inherit;
+select conrelid::regclass, conname, contype, coninhcount, conislocal
+ from pg_constraint where contype = 'n' and
+ conrelid::regclass::text in ('part1', 'ch1', 'ch2', 'ch3')
+ order by 2, 1;
+\d+ ch1
+\d+ ch2
+\d+ ch3
+
+drop table part1 cascade;
+
+-- Test not null inherit constraint which already exists on child table.
+create table part1 (f1 int not null no inherit);
+create table ch1 (f2 text, f3 int) inherits (part1);
+create table ch2 (f4 float) inherits (part1, ch1);
+alter table ch1 alter f1 set not null;
+\d+ ch1
+alter table part1 alter constraint part1_f1_not_null set inherit;
+select conrelid::regclass, conname, contype, coninhcount, conislocal
+ from pg_constraint where contype = 'n' and
+ conrelid::regclass::text in ('part1', 'ch1', 'ch2')
+ order by 2, 1;
+\d+ ch1
+\d+ ch2
+
+drop table part1 cascade;
+
+create table part1 (f1 int not null no inherit);
+create table ch1 (f2 text, f3 int not null no inherit) inherits (part1);
+create table ch2 (f4 float) inherits (part1, ch1);
+alter table ch1 alter constraint ch1_f3_not_null set inherit;
+create table ch3 () inherits (part1, ch1, ch2);
+select conrelid::regclass, conname, contype, coninhcount, conislocal
+ from pg_constraint where contype = 'n' and
+ conrelid::regclass::text in ('part1', 'ch1', 'ch2', 'ch3')
+ order by 2, 1;
+\d+ ch1
+\d+ ch2
+\d+ ch3
+
+drop table part1 cascade;
+
+-- Multilevel inheritance.
+create table part1 (f1 int not null no inherit);
+create table ch1 (f2 text, f3 int) inherits (part1);
+create table ch2 (f4 float) inherits (ch1);
+create table ch3 () inherits (ch2);
+alter table part1 alter constraint part1_f1_not_null set inherit;
+select conrelid::regclass, conname, contype, coninhcount, conislocal
+ from pg_constraint where contype = 'n' and
+ conrelid::regclass::text in ('part1', 'ch1', 'ch2', 'ch3')
+ order by 2, 1;
+\d+ ch1
+\d+ ch2
+\d+ ch3
+
+-- Test no inherit.
+alter table part1 alter constraint part1_f1_not_null set no inherit;
+select conrelid::regclass, conname, contype, coninhcount, conislocal
+ from pg_constraint where contype = 'n' and
+ conrelid::regclass::text in ('part1', 'ch1', 'ch2', 'ch3')
+ order by 2, 1;
+\d+ ch1
+\d+ ch2
+\d+ ch3
+
+drop table part1 cascade;
+
+-- If existing behavior is INHERIT.
+create table part1 (f1 int not null);
+create table ch1 (f2 text, f3 int) inherits (part1);
+create table ch2 (f4 float) inherits (ch1);
+create table ch3 () inherits (ch2);
+select conrelid::regclass, conname, contype, coninhcount, conislocal
+ from pg_constraint where contype = 'n' and
+ conrelid::regclass::text in ('part1', 'ch1', 'ch2', 'ch3')
+ order by 2, 1;
+alter table part1 alter constraint part1_f1_not_null set inherit;
+select conrelid::regclass, conname, contype, coninhcount, conislocal
+ from pg_constraint where contype = 'n' and
+ conrelid::regclass::text in ('part1', 'ch1', 'ch2', 'ch3')
+ order by 2, 1;
+
+-- Set to no inherit.
+alter table part1 alter constraint part1_f1_not_null set no inherit;
+select conrelid::regclass, conname, contype, coninhcount, conislocal
+ from pg_constraint where contype = 'n' and
+ conrelid::regclass::text in ('part1', 'ch1', 'ch2', 'ch3')
+ order by 2, 1;
+
+drop table part1 cascade;
+
+-- Test no inherit when child has inherited constraint from multiple parents.
+create table part1 (f1 int not null);
+create table ch1 (f2 text, f3 int) inherits (part1);
+create table ch2 (f4 float) inherits (part1, ch1);
+create table ch3 () inherits (part1, ch1, ch2);
+create table part2(f1 int not null);
+alter table ch2 inherit part2;
+select conrelid::regclass, conname, contype, coninhcount, conislocal
+ from pg_constraint where contype = 'n' and
+ conrelid::regclass::text in ('part1', 'ch1', 'ch2', 'ch3')
+ order by 2, 1;
+alter table part1 alter constraint part1_f1_not_null set no inherit;
+select conrelid::regclass, conname, contype, coninhcount, conislocal
+ from pg_constraint where contype = 'n' and
+ conrelid::regclass::text in ('part1', 'ch1', 'ch2', 'ch3')
+ order by 2, 1;
+\d+ ch1
+\d+ ch2
+\d+ ch3
+
+drop table part1 cascade;
+drop table part2 cascade;
+
+-- Negative scenarios for alter constraint .. set inherit.
+-- Other than not null constraints are not allowed to inherit.
+create table part1 (f1 int check(f1 > 5));
+alter table part1 alter constraint part1_f1_check set inherit;
+drop table part1;
+
+-- error out when provided not null constarint does not exists.
+create table part1(f1 int not null no inherit);
+alter table part1 alter constraint foo set inherit;
+drop table part1;
+
+--
-- Mixed ownership inheritance tree
--
create role regress_alice;