Revert "Accept relations of any kind in LOCK TABLE".

Revert 59ab4ac32, as well as the followup fix 33862cb9c, in all
branches.  We need to think a bit harder about what the behavior
of LOCK TABLE on views should be, and there's no time for that
before next week's releases.  We'll take another crack at this
later.

Discussion: https://postgr.es/m/16703-e348f58aab3cf6cc@postgresql.org

3 files changed, 12 insertions, 28 deletions

diff --git a/src/backend/commands/lockcmds.c b/src/backend/commands/lockcmds.c
index 15b4c2f90ad..a1670821aa4 100644
--- a/src/backend/commands/lockcmds.c
+++ b/src/backend/commands/lockcmds.c
@@ -87,6 +87,13 @@ RangeVarCallbackForLockTable(const RangeVar *rv, Oid relid, Oid oldrelid,
 		return;					/* woops, concurrently dropped; no permissions
 								 * check */
 
+	/* Currently, we only allow plain tables to be locked */
+	if (relkind != RELKIND_RELATION)
+		ereport(ERROR,
+				(errcode(ERRCODE_WRONG_OBJECT_TYPE),
+				 errmsg("\"%s\" is not a table",
+						rv->relname)));
+
 	/* Check permissions. */
 	aclresult = LockTableAclCheck(relid, lockmode);
 	if (aclresult != ACLCHECK_OK)
diff --git a/src/test/regress/expected/lock.out b/src/test/regress/expected/lock.out
index fec1c379833..fd273445030 100644
--- a/src/test/regress/expected/lock.out
+++ b/src/test/regress/expected/lock.out
@@ -5,10 +5,7 @@
 CREATE SCHEMA lock_schema1;
 SET search_path = lock_schema1;
 CREATE TABLE lock_tbl1 (a BIGINT);
-CREATE VIEW lock_view1 AS SELECT 1 AS a;
-CREATE MATERIALIZED VIEW lock_mv1 AS SELECT * FROM lock_view1;
-CREATE INDEX lock_mvi1 ON lock_mv1 (a);
-CREATE SEQUENCE lock_seq;
+CREATE VIEW lock_view1 AS SELECT 1;
 CREATE ROLE regress_rol_lock1;
 ALTER ROLE regress_rol_lock1 SET search_path = lock_schema1;
 GRANT USAGE ON SCHEMA lock_schema1 TO regress_rol_lock1;
@@ -33,7 +30,8 @@ LOCK TABLE lock_tbl1 IN SHARE MODE NOWAIT;
 LOCK TABLE lock_tbl1 IN SHARE ROW EXCLUSIVE MODE NOWAIT;
 LOCK TABLE lock_tbl1 IN EXCLUSIVE MODE NOWAIT;
 LOCK TABLE lock_tbl1 IN ACCESS EXCLUSIVE MODE NOWAIT;
-LOCK TABLE lock_view1 IN EXCLUSIVE MODE;
+LOCK TABLE lock_view1 IN EXCLUSIVE MODE;   -- Will fail; can't lock a non-table
+ERROR:  "lock_view1" is not a table
 ROLLBACK;
 -- Verify that we can lock a table with inheritance children.
 CREATE TABLE lock_tbl2 (b BIGINT) INHERITS (lock_tbl1);
@@ -53,21 +51,13 @@ BEGIN;
 LOCK TABLE ONLY lock_tbl1;
 ROLLBACK;
 RESET ROLE;
--- Lock other relations
-BEGIN TRANSACTION;
-LOCK TABLE lock_mv1;
-LOCK TABLE lock_mvi1;
-LOCK TABLE lock_seq;
-ROLLBACK;
 --
 -- Clean up
 --
-DROP MATERIALIZED VIEW lock_mv1;
 DROP VIEW lock_view1;
 DROP TABLE lock_tbl3;
 DROP TABLE lock_tbl2;
 DROP TABLE lock_tbl1;
-DROP SEQUENCE lock_seq;
 DROP SCHEMA lock_schema1 CASCADE;
 DROP ROLE regress_rol_lock1;
 -- atomic ops tests
diff --git a/src/test/regress/sql/lock.sql b/src/test/regress/sql/lock.sql
index 81af5d08fc8..567e8bccf1b 100644
--- a/src/test/regress/sql/lock.sql
+++ b/src/test/regress/sql/lock.sql
@@ -6,10 +6,7 @@
 CREATE SCHEMA lock_schema1;
 SET search_path = lock_schema1;
 CREATE TABLE lock_tbl1 (a BIGINT);
-CREATE VIEW lock_view1 AS SELECT 1 AS a;
-CREATE MATERIALIZED VIEW lock_mv1 AS SELECT * FROM lock_view1;
-CREATE INDEX lock_mvi1 ON lock_mv1 (a);
-CREATE SEQUENCE lock_seq;
+CREATE VIEW lock_view1 AS SELECT 1;
 CREATE ROLE regress_rol_lock1;
 ALTER ROLE regress_rol_lock1 SET search_path = lock_schema1;
 GRANT USAGE ON SCHEMA lock_schema1 TO regress_rol_lock1;
@@ -36,7 +33,7 @@ LOCK TABLE lock_tbl1 IN SHARE MODE NOWAIT;
 LOCK TABLE lock_tbl1 IN SHARE ROW EXCLUSIVE MODE NOWAIT;
 LOCK TABLE lock_tbl1 IN EXCLUSIVE MODE NOWAIT;
 LOCK TABLE lock_tbl1 IN ACCESS EXCLUSIVE MODE NOWAIT;
-LOCK TABLE lock_view1 IN EXCLUSIVE MODE;
+LOCK TABLE lock_view1 IN EXCLUSIVE MODE;   -- Will fail; can't lock a non-table
 ROLLBACK;
 
 -- Verify that we can lock a table with inheritance children.
@@ -58,23 +55,13 @@ LOCK TABLE ONLY lock_tbl1;
 ROLLBACK;
 RESET ROLE;
 
--- Lock other relations
-BEGIN TRANSACTION;
-LOCK TABLE lock_mv1;
-LOCK TABLE lock_mvi1;
-LOCK TABLE lock_seq;
-ROLLBACK;
-
-
 --
 -- Clean up
 --
-DROP MATERIALIZED VIEW lock_mv1;
 DROP VIEW lock_view1;
 DROP TABLE lock_tbl3;
 DROP TABLE lock_tbl2;
 DROP TABLE lock_tbl1;
-DROP SEQUENCE lock_seq;
 DROP SCHEMA lock_schema1 CASCADE;
 DROP ROLE regress_rol_lock1;