----
-- Regression test to Global Temporary Table implementation
--
-- Test for TRUNCATE on GTT with temporary table first access in a transaction.
-- The temporary table must not persist after the transaction rollback.
--
----
-- Import the library
LOAD 'pgtt';
-- Create a GTT like table
CREATE GLOBAL TEMPORARY TABLE t_glob_temptable1 (id integer, lbl text) ON COMMIT PRESERVE ROWS;
WARNING:  GLOBAL is deprecated in temporary table creation
LINE 1: CREATE GLOBAL TEMPORARY TABLE t_glob_temptable1 (id integer,...
               ^
-- Look at Global Temporary Table definition
SELECT nspname, relname, preserved, code FROM pgtt_schema.pg_global_temp_tables;
   nspname   |      relname      | preserved |         code         
-------------+-------------------+-----------+----------------------
 pgtt_schema | t_glob_temptable1 | t         | id integer, lbl text
(1 row)

-- A "template" unlogged table should exists
SELECT n.nspname, c.relname FROM pg_class c JOIN pg_namespace n ON (c.relnamespace=n.oid) WHERE relname = 't_glob_temptable1';
   nspname   |      relname      
-------------+-------------------
 pgtt_schema | t_glob_temptable1
(1 row)

BEGIN;
-- Truncate first will not create the temporary table, it will
-- be operated on the "template" table which will do nothing.
TRUNCATE t_glob_temptable1;
-- Look if we have two tables now
SELECT n.nspname, c.relname FROM pg_class c JOIN pg_namespace n ON (c.relnamespace=n.oid) WHERE relname = 't_glob_temptable1';
   nspname   |      relname      
-------------+-------------------
 pgtt_schema | t_glob_temptable1
(1 row)

-- Insert some value will create the temporary table
INSERT INTO t_glob_temptable1 VALUES (1, 'One');
INSERT INTO t_glob_temptable1 VALUES (2, 'Two');
-- Look at content of the template for Global Temporary Table, must be empty
SET pgtt.enabled TO off;
SELECT * FROM pgtt_schema.t_glob_temptable1;
 id | lbl 
----+-----
(0 rows)

SET pgtt.enabled TO on;
-- Look at content of the Global Temporary Table
SELECT * FROM t_glob_temptable1;
 id | lbl 
----+-----
  1 | One
  2 | Two
(2 rows)

-- Now truncate the temporary table
TRUNCATE t_glob_temptable1;
-- Verify that there is no mo rows
SELECT * FROM t_glob_temptable1;
 id | lbl 
----+-----
(0 rows)

ROLLBACK;
-- The "template" unlogged table exists, but the
-- temporary table not because of the rollback
SELECT n.nspname, c.relname FROM pg_class c JOIN pg_namespace n ON (c.relnamespace=n.oid) WHERE relname = 't_glob_temptable1';
   nspname   |      relname      
-------------+-------------------
 pgtt_schema | t_glob_temptable1
(1 row)

-- Reconnect and drop it
\c - -
LOAD 'pgtt';
-- Cleanup
DROP TABLE t_glob_temptable1;