PG16 - Add reindex database/system tests (#7167)

In PG16, REINDEX DATABASE/SYSTEM name is optional.
We already don't propagate these commands automatically.
Testing here with run_command_on_workers.

Relevant PG commit:
https://github.com/postgres/postgres/commit/2cbc3c1

src/test/regress/expected/pg16.out

@@ -654,6 +654,28 @@ SELECT pg_get_viewdef('pg16.prop_view_1', true);
 
 \c - - - :master_port
 SET search_path TO pg16;
+-- REINDEX DATABASE/SYSTEM name is optional
+-- We already don't propagate these commands automatically
+-- Testing here with run_command_on_workers
+-- Relevant PG commit: https://github.com/postgres/postgres/commit/2cbc3c1
+REINDEX DATABASE;
+SELECT result FROM run_command_on_workers
+($$REINDEX DATABASE$$);
+ result
+---------------------------------------------------------------------
+ REINDEX
+ REINDEX
+(2 rows)
+
+REINDEX SYSTEM;
+SELECT result FROM run_command_on_workers
+($$REINDEX SYSTEM$$);
+ result
+---------------------------------------------------------------------
+ REINDEX
+ REINDEX
+(2 rows)
+
 \set VERBOSITY terse
 SET client_min_messages TO ERROR;
 DROP SCHEMA pg16 CASCADE;

src/test/regress/sql/pg16.sql

@@ -375,35 +375,18 @@ SELECT pg_get_viewdef('pg16.prop_view_1', true);
 \c - - - :master_port
 SET search_path TO pg16;
 
---
--- PG16 allows GRANT WITH ADMIN | INHERIT | SET
---
--- GRANT privileges to a role or roles  
-\c - - - :master_port
-CREATE ROLE create_role;
-CREATE ROLE create_role_2;
-CREATE ROLE create_role_3;
-CREATE ROLE create_role_4;
-CREATE USER create_user;
-CREATE USER create_user_2;
-CREATE GROUP create_group;
-CREATE GROUP create_group_2;
+-- REINDEX DATABASE/SYSTEM name is optional
+-- We already don't propagate these commands automatically
+-- Testing here with run_command_on_workers
+-- Relevant PG commit: https://github.com/postgres/postgres/commit/2cbc3c1
 
---test grant role
-GRANT create_group TO create_role;
-GRANT create_group TO create_role_2 WITH ADMIN OPTION;
-GRANT create_group TO create_role_3 WITH INHERIT;
-GRANT create_group TO create_role_4 WITH SET; 
-
--- ADMIN role can perfom administrative tasks 
--- role can now access the data and permissions of the table (owner of table)
--- role can change current user to any other user/role that has access 
-GRANT ADMIN TO joe;
-GRANT INHERIT ON ROLE joe TO james;
-
-GRANT SELECT ON companies TO joe WITH GRANT OPTION;
-GRANT SET (SELECT) ON companies TO james;
+REINDEX DATABASE;
+SELECT result FROM run_command_on_workers
+($$REINDEX DATABASE$$);
 
+REINDEX SYSTEM;
+SELECT result FROM run_command_on_workers
+($$REINDEX SYSTEM$$);
 
 \set VERBOSITY terse
 SET client_min_messages TO ERROR;