Fix VALIDATE CONSTRAINT to consider NO INHERIT attribute.

Currently, trying to validate a NO INHERIT constraint on the parent will
search for the constraint in child tables (where it is not supposed to
exist), wrongly causing a "constraint does not exist" error.

Amit Langote, per a report from Hans Buschmann.

Discussion: http://postgr.es/m/20170421184012[email protected]

diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 972e2c94b7fbef1a0abfe920569140faaed82a6d..471a44bf0d9d6e3700b93dadd14d3e48a6f1b98f 100644 (file)
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -6262,9 +6262,10 @@ ATExecValidateConstraint(Relation rel, char *constrName, bool recurse,
 
            /*
             * If we're recursing, the parent has already done this, so skip
-            * it.
+            * it.  Also, if the constraint is a NO INHERIT constraint, we
+            * shouldn't try to look for it in the children.
             */
-           if (!recursing)
+           if (!recursing && !con->connoinherit)
                children = find_all_inheritors(RelationGetRelid(rel),
                                               lockmode, NULL);
 

diff --git a/src/test/regress/expected/alter_table.out b/src/test/regress/expected/alter_table.out
index 33eb7e05c1d38142ed829d7eee4f98c7b9462bd6..14af69d5933a73f8baeec2625334ff4d6b9f3a02 100644 (file)
--- a/src/test/regress/expected/alter_table.out
+++ b/src/test/regress/expected/alter_table.out
@@ -365,6 +365,26 @@ NOTICE:  merging constraint "identity" with inherited definition
 ALTER TABLE tmp3 VALIDATE CONSTRAINT identity;
 NOTICE:  boo: 16
 NOTICE:  boo: 20
+-- A NO INHERIT constraint should not be looked for in children during VALIDATE CONSTRAINT
+create table parent_noinh_convalid (a int);
+create table child_noinh_convalid () inherits (parent_noinh_convalid);
+insert into parent_noinh_convalid values (1);
+insert into child_noinh_convalid values (1);
+alter table parent_noinh_convalid add constraint check_a_is_2 check (a = 2) no inherit not valid;
+-- fail, because of the row in parent
+alter table parent_noinh_convalid validate constraint check_a_is_2;
+ERROR:  check constraint "check_a_is_2" is violated by some row
+delete from only parent_noinh_convalid;
+-- ok (parent itself contains no violating rows)
+alter table parent_noinh_convalid validate constraint check_a_is_2;
+select convalidated from pg_constraint where conrelid = 'parent_noinh_convalid'::regclass and conname = 'check_a_is_2';
+ convalidated 
+--------------
+ t
+(1 row)
+
+-- cleanup
+drop table parent_noinh_convalid, child_noinh_convalid;
 -- Try (and fail) to create constraint from tmp5(a) to tmp4(a) - unique constraint on
 -- tmp4 is a,b
 ALTER TABLE tmp5 add constraint tmpconstr foreign key(a) references tmp4(a) match full;

diff --git a/src/test/regress/sql/alter_table.sql b/src/test/regress/sql/alter_table.sql
index 97cb100f6472c4d0709cc8635ac5e2e848615a46..2975c641d89077b92cb0bdd74bde9315fbbbe63c 100644 (file)
--- a/src/test/regress/sql/alter_table.sql
+++ b/src/test/regress/sql/alter_table.sql
@@ -306,6 +306,21 @@ ALTER TABLE tmp7 ADD CONSTRAINT identity CHECK (b = boo(b));
 ALTER TABLE tmp3 ADD CONSTRAINT IDENTITY check (b = boo(b)) NOT VALID;
 ALTER TABLE tmp3 VALIDATE CONSTRAINT identity;
 
+-- A NO INHERIT constraint should not be looked for in children during VALIDATE CONSTRAINT
+create table parent_noinh_convalid (a int);
+create table child_noinh_convalid () inherits (parent_noinh_convalid);
+insert into parent_noinh_convalid values (1);
+insert into child_noinh_convalid values (1);
+alter table parent_noinh_convalid add constraint check_a_is_2 check (a = 2) no inherit not valid;
+-- fail, because of the row in parent
+alter table parent_noinh_convalid validate constraint check_a_is_2;
+delete from only parent_noinh_convalid;
+-- ok (parent itself contains no violating rows)
+alter table parent_noinh_convalid validate constraint check_a_is_2;
+select convalidated from pg_constraint where conrelid = 'parent_noinh_convalid'::regclass and conname = 'check_a_is_2';
+-- cleanup
+drop table parent_noinh_convalid, child_noinh_convalid;
+
 -- Try (and fail) to create constraint from tmp5(a) to tmp4(a) - unique constraint on
 -- tmp4 is a,b