Fix crash if a DROP is attempted on an internally-dependent object.

Introduced in 8.4 rewrite of dependency.c.
Per bug #5072 from Amit Khandekar.

diff --git a/src/backend/catalog/dependency.c b/src/backend/catalog/dependency.c
index 3de6d5145edfc910f8664d5ac3c309fa78dea4a1..d35387e78191979dd432264d12cf6fd00483d2fb 100644 (file)
--- a/src/backend/catalog/dependency.c
+++ b/src/backend/catalog/dependency.c
@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *       $PostgreSQL: pgsql/src/backend/catalog/dependency.c,v 1.89.2.1 2009/08/07 15:28:07 tgl Exp $
+ *       $PostgreSQL: pgsql/src/backend/catalog/dependency.c,v 1.89.2.2 2009/09/22 15:46:43 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -559,7 +559,8 @@ findDependentObjects(const ObjectAddress *object,
                                {
                                        char       *otherObjDesc;
 
-                                       if (object_address_present(&otherObject, pendingObjects))
+                                       if (pendingObjects &&
+                                               object_address_present(&otherObject, pendingObjects))
                                        {
                                                systable_endscan(scan);
                                                /* need to release caller's lock; see notes below */

diff --git a/src/test/regress/expected/rules.out b/src/test/regress/expected/rules.out
index 2667a13e44e03b372961e4bf9e64ddf4a978b0f3..78e3df5871d9240da276353787b2652fa7ab912d 100644 (file)
--- a/src/test/regress/expected/rules.out
+++ b/src/test/regress/expected/rules.out
@@ -1444,6 +1444,14 @@ insert into rule_and_refint_t3 values (1, 13, 11, 'row8');
 ERROR:  insert or update on table "rule_and_refint_t3" violates foreign key constraint "rule_and_refint_t3_id3a_fkey"
 DETAIL:  Key (id3a,id3b)=(1,13) is not present in table "rule_and_refint_t1".
 --
+-- disallow dropping a view's rule (bug #5072)
+--
+create view fooview as select 'foo'::text;
+drop rule "_RETURN" on fooview;
+ERROR:  cannot drop rule _RETURN on view fooview because view fooview requires it
+HINT:  You can drop view fooview instead.
+drop view fooview;
+--
 -- check for planner problems with complex inherited UPDATES
 --
 create table id (id serial primary key, name text);

diff --git a/src/test/regress/sql/rules.sql b/src/test/regress/sql/rules.sql
index a522d52d19909f7f23d9f680e55ae13478d41bb9..c7cf788b20ee4e8e7e6cd39f825b8a884c812864 100644 (file)
--- a/src/test/regress/sql/rules.sql
+++ b/src/test/regress/sql/rules.sql
@@ -851,6 +851,14 @@ create rule rule_and_refint_t3_ins as on insert to rule_and_refint_t3
 insert into rule_and_refint_t3 values (1, 11, 13, 'row7');
 insert into rule_and_refint_t3 values (1, 13, 11, 'row8');
 
+--
+-- disallow dropping a view's rule (bug #5072)
+--
+
+create view fooview as select 'foo'::text;
+drop rule "_RETURN" on fooview;
+drop view fooview;
+
 --
 -- check for planner problems with complex inherited UPDATES
 --