-- these triggers are dedicated to HPHC of RI who
-- decided that my kid's name was william not willem, and
-- vigorously resisted all efforts at correction.  they have
-- since gone bankrupt...
CREATE FUNCTION users_insert() returns trigger
	AS
'if TD["new"]["fname"] == None or TD["new"]["lname"] == None:
	return "SKIP"
if TD["new"]["username"] == None:
	TD["new"]["username"] = TD["new"]["fname"][:1] + "_" + TD["new"]["lname"]
	rv = "MODIFY"
else:
	rv = None
if TD["new"]["fname"] == "william":
	TD["new"]["fname"] = TD["args"][0]
	rv = "MODIFY"
return rv'
	LANGUAGE plpythonu;
CREATE FUNCTION users_update() returns trigger
	AS
'if TD["event"] == "UPDATE":
	if TD["old"]["fname"] != TD["new"]["fname"] and TD["old"]["fname"] == TD["args"][0]:
		return "SKIP"
return None'
	LANGUAGE plpythonu;
CREATE FUNCTION users_delete() RETURNS trigger
	AS
'if TD["old"]["fname"] == TD["args"][0]:
	return "SKIP"
return None'
	LANGUAGE plpythonu;
CREATE TRIGGER users_insert_trig BEFORE INSERT ON users FOR EACH ROW
	EXECUTE PROCEDURE users_insert ('willem');
CREATE TRIGGER users_update_trig BEFORE UPDATE ON users FOR EACH ROW
	EXECUTE PROCEDURE users_update ('willem');
CREATE TRIGGER users_delete_trig BEFORE DELETE ON users FOR EACH ROW
	EXECUTE PROCEDURE users_delete ('willem');
-- quick peek at the table
--
SELECT * FROM users;
 fname  | lname | username | userid 
--------+-------+----------+--------
 jane   | doe   | j_doe    |      1
 john   | doe   | johnd    |      2
 willem | doe   | w_doe    |      3
 rick   | smith | slash    |      4
(4 rows)

-- should fail
--
UPDATE users SET fname = 'william' WHERE fname = 'willem';
-- should modify william to willem and create username
--
INSERT INTO users (fname, lname) VALUES ('william', 'smith');
INSERT INTO users (fname, lname, username) VALUES ('charles', 'darwin', 'beagle');
SELECT * FROM users;
  fname  | lname  | username | userid 
---------+--------+----------+--------
 jane    | doe    | j_doe    |      1
 john    | doe    | johnd    |      2
 willem  | doe    | w_doe    |      3
 rick    | smith  | slash    |      4
 willem  | smith  | w_smith  |      5
 charles | darwin | beagle   |      6
(6 rows)

-- dump trigger data
CREATE TABLE trigger_test
	(i int, v text );
CREATE TABLE trigger_test_generated (
	i int,
        j int GENERATED ALWAYS AS (i * 2) STORED
);
CREATE FUNCTION trigger_data() RETURNS trigger LANGUAGE plpythonu AS $$

if 'relid' in TD:
	TD['relid'] = "bogus:12345"

skeys = list(TD.keys())
skeys.sort()
for key in skeys:
    val = TD[key]
    if not isinstance(val, dict):
        plpy.notice("TD[" + key + "] => " + str(val))
    else:
        # print dicts the hard way because otherwise the order is implementation-dependent
        valkeys = list(val.keys())
        valkeys.sort()
        plpy.notice("TD[" + key + "] => " + '{' + ', '.join([repr(k) + ': ' + repr(val[k]) for k in valkeys]) + '}')

return None

$$;
CREATE TRIGGER show_trigger_data_trig_before
BEFORE INSERT OR UPDATE OR DELETE ON trigger_test
FOR EACH ROW EXECUTE PROCEDURE trigger_data(23,'skidoo');
CREATE TRIGGER show_trigger_data_trig_after
AFTER INSERT OR UPDATE OR DELETE ON trigger_test
FOR EACH ROW EXECUTE PROCEDURE trigger_data(23,'skidoo');
CREATE TRIGGER show_trigger_data_trig_stmt
BEFORE INSERT OR UPDATE OR DELETE OR TRUNCATE ON trigger_test
FOR EACH STATEMENT EXECUTE PROCEDURE trigger_data(23,'skidoo');
ERROR:  Triggers for statements are not yet supported
insert into trigger_test values(1,'insert');
NOTICE:  TD[args] => ['23', 'skidoo']
NOTICE:  TD[event] => INSERT
NOTICE:  TD[level] => ROW
NOTICE:  TD[name] => show_trigger_data_trig_before
NOTICE:  TD[new] => {'i': 1, 'v': 'insert'}
NOTICE:  TD[old] => None
NOTICE:  TD[relid] => bogus:12345
NOTICE:  TD[table_name] => trigger_test
NOTICE:  TD[table_schema] => public
NOTICE:  TD[when] => BEFORE
NOTICE:  TD[args] => ['23', 'skidoo']
NOTICE:  TD[event] => INSERT
NOTICE:  TD[level] => ROW
NOTICE:  TD[name] => show_trigger_data_trig_after
NOTICE:  TD[new] => {'i': 1, 'v': 'insert'}
NOTICE:  TD[old] => None
NOTICE:  TD[relid] => bogus:12345
NOTICE:  TD[table_name] => trigger_test
NOTICE:  TD[table_schema] => public
NOTICE:  TD[when] => AFTER
update trigger_test set v = 'update' where i = 1;
NOTICE:  TD[args] => ['23', 'skidoo']
NOTICE:  TD[event] => UPDATE
NOTICE:  TD[level] => ROW
NOTICE:  TD[name] => show_trigger_data_trig_before
NOTICE:  TD[new] => {'i': 1, 'v': 'update'}
NOTICE:  TD[old] => {'i': 1, 'v': 'insert'}
NOTICE:  TD[relid] => bogus:12345
NOTICE:  TD[table_name] => trigger_test
NOTICE:  TD[table_schema] => public
NOTICE:  TD[when] => BEFORE
NOTICE:  TD[args] => ['23', 'skidoo']
NOTICE:  TD[event] => UPDATE
NOTICE:  TD[level] => ROW
NOTICE:  TD[name] => show_trigger_data_trig_after
NOTICE:  TD[new] => {'i': 1, 'v': 'update'}
NOTICE:  TD[old] => {'i': 1, 'v': 'insert'}
NOTICE:  TD[relid] => bogus:12345
NOTICE:  TD[table_name] => trigger_test
NOTICE:  TD[table_schema] => public
NOTICE:  TD[when] => AFTER
delete from trigger_test;
NOTICE:  TD[args] => ['23', 'skidoo']
NOTICE:  TD[event] => DELETE
NOTICE:  TD[level] => ROW
NOTICE:  TD[name] => show_trigger_data_trig_before
NOTICE:  TD[new] => None
NOTICE:  TD[old] => {'i': 1, 'v': 'update'}
NOTICE:  TD[relid] => bogus:12345
NOTICE:  TD[table_name] => trigger_test
NOTICE:  TD[table_schema] => public
NOTICE:  TD[when] => BEFORE
NOTICE:  TD[args] => ['23', 'skidoo']
NOTICE:  TD[event] => DELETE
NOTICE:  TD[level] => ROW
NOTICE:  TD[name] => show_trigger_data_trig_after
NOTICE:  TD[new] => None
NOTICE:  TD[old] => {'i': 1, 'v': 'update'}
NOTICE:  TD[relid] => bogus:12345
NOTICE:  TD[table_name] => trigger_test
NOTICE:  TD[table_schema] => public
NOTICE:  TD[when] => AFTER
truncate table trigger_test;
DROP TRIGGER show_trigger_data_trig_stmt on trigger_test;
ERROR:  trigger "show_trigger_data_trig_stmt" for table "trigger_test" does not exist
DROP TRIGGER show_trigger_data_trig_before on trigger_test;
DROP TRIGGER show_trigger_data_trig_after on trigger_test;
CREATE TRIGGER show_trigger_data_trig_before
BEFORE INSERT OR UPDATE OR DELETE ON trigger_test_generated
FOR EACH ROW EXECUTE PROCEDURE trigger_data();
CREATE TRIGGER show_trigger_data_trig_after
AFTER INSERT OR UPDATE OR DELETE ON trigger_test_generated
FOR EACH ROW EXECUTE PROCEDURE trigger_data();
insert into trigger_test_generated (i) values (1);
NOTICE:  TD[args] => None
NOTICE:  TD[event] => INSERT
NOTICE:  TD[level] => ROW
NOTICE:  TD[name] => show_trigger_data_trig_before
NOTICE:  TD[new] => {'i': 1}
NOTICE:  TD[old] => None
NOTICE:  TD[relid] => bogus:12345
NOTICE:  TD[table_name] => trigger_test_generated
NOTICE:  TD[table_schema] => public
NOTICE:  TD[when] => BEFORE
NOTICE:  TD[args] => None
NOTICE:  TD[event] => INSERT
NOTICE:  TD[level] => ROW
NOTICE:  TD[name] => show_trigger_data_trig_after
NOTICE:  TD[new] => {'i': 1, 'j': 2}
NOTICE:  TD[old] => None
NOTICE:  TD[relid] => bogus:12345
NOTICE:  TD[table_name] => trigger_test_generated
NOTICE:  TD[table_schema] => public
NOTICE:  TD[when] => AFTER
-- GPDB: Fails, updating the distribution key with triggers is not allowed.
update trigger_test_generated set i = 11 where i = 1;
ERROR:  UPDATE on distributed key column not allowed on relation with update triggers
-- try this instead:
update trigger_test_generated set j = default where i = 1;
NOTICE:  TD[args] => None
NOTICE:  TD[event] => UPDATE
NOTICE:  TD[level] => ROW
NOTICE:  TD[name] => show_trigger_data_trig_before
NOTICE:  TD[new] => {'i': 1}
NOTICE:  TD[old] => {'i': 1, 'j': 2}
NOTICE:  TD[relid] => bogus:12345
NOTICE:  TD[table_name] => trigger_test_generated
NOTICE:  TD[table_schema] => public
NOTICE:  TD[when] => BEFORE
NOTICE:  TD[args] => None
NOTICE:  TD[event] => UPDATE
NOTICE:  TD[level] => ROW
NOTICE:  TD[name] => show_trigger_data_trig_after
NOTICE:  TD[new] => {'i': 1, 'j': 2}
NOTICE:  TD[old] => {'i': 1, 'j': 2}
NOTICE:  TD[relid] => bogus:12345
NOTICE:  TD[table_name] => trigger_test_generated
NOTICE:  TD[table_schema] => public
NOTICE:  TD[when] => AFTER
delete from trigger_test_generated;
NOTICE:  TD[args] => None
NOTICE:  TD[event] => DELETE
NOTICE:  TD[level] => ROW
NOTICE:  TD[name] => show_trigger_data_trig_before
NOTICE:  TD[new] => None
NOTICE:  TD[old] => {'i': 1, 'j': 2}
NOTICE:  TD[relid] => bogus:12345
NOTICE:  TD[table_name] => trigger_test_generated
NOTICE:  TD[table_schema] => public
NOTICE:  TD[when] => BEFORE
NOTICE:  TD[args] => None
NOTICE:  TD[event] => DELETE
NOTICE:  TD[level] => ROW
NOTICE:  TD[name] => show_trigger_data_trig_after
NOTICE:  TD[new] => None
NOTICE:  TD[old] => {'i': 1, 'j': 2}
NOTICE:  TD[relid] => bogus:12345
NOTICE:  TD[table_name] => trigger_test_generated
NOTICE:  TD[table_schema] => public
NOTICE:  TD[when] => AFTER
DROP TRIGGER show_trigger_data_trig_before ON trigger_test_generated;
DROP TRIGGER show_trigger_data_trig_after ON trigger_test_generated;
insert into trigger_test values(1,'insert');
CREATE VIEW trigger_test_view AS SELECT * FROM trigger_test;
--start_ignore
-- INSTEAD OF triggers are not yet supported in Cloudberry
CREATE TRIGGER show_trigger_data_trig
INSTEAD OF INSERT OR UPDATE OR DELETE ON trigger_test_view
FOR EACH ROW EXECUTE PROCEDURE trigger_data(24,'skidoo view');
insert into trigger_test_view values(2,'insert');
NOTICE:  TD[args] => ['24', 'skidoo view']
NOTICE:  TD[event] => INSERT
NOTICE:  TD[level] => ROW
NOTICE:  TD[name] => show_trigger_data_trig
NOTICE:  TD[new] => {'i': 2, 'v': 'insert'}
NOTICE:  TD[old] => None
NOTICE:  TD[relid] => bogus:12345
NOTICE:  TD[table_name] => trigger_test_view
NOTICE:  TD[table_schema] => public
NOTICE:  TD[when] => INSTEAD OF
update trigger_test_view set v = 'update' where i = 1;
NOTICE:  TD[args] => ['24', 'skidoo view']
NOTICE:  TD[event] => UPDATE
NOTICE:  TD[level] => ROW
NOTICE:  TD[name] => show_trigger_data_trig
NOTICE:  TD[new] => {'i': 1, 'v': 'update'}
NOTICE:  TD[old] => {'i': 1, 'v': 'insert'}
NOTICE:  TD[relid] => bogus:12345
NOTICE:  TD[table_name] => trigger_test_view
NOTICE:  TD[table_schema] => public
NOTICE:  TD[when] => INSTEAD OF
delete from trigger_test_view;
NOTICE:  TD[args] => ['24', 'skidoo view']
NOTICE:  TD[event] => DELETE
NOTICE:  TD[level] => ROW
NOTICE:  TD[name] => show_trigger_data_trig
NOTICE:  TD[new] => None
NOTICE:  TD[old] => {'i': 1, 'v': 'insert'}
NOTICE:  TD[relid] => bogus:12345
NOTICE:  TD[table_name] => trigger_test_view
NOTICE:  TD[table_schema] => public
NOTICE:  TD[when] => INSTEAD OF
DROP FUNCTION trigger_data() CASCADE;
NOTICE:  drop cascades to trigger show_trigger_data_trig on view trigger_test_view
--end_ignore
DROP VIEW trigger_test_view;
delete from trigger_test;
--
-- trigger error handling
--
INSERT INTO trigger_test VALUES (0, 'zero');
-- returning non-string from trigger function
CREATE FUNCTION stupid1() RETURNS trigger
AS $$
    return 37
$$ LANGUAGE plpythonu;
CREATE TRIGGER stupid_trigger1
BEFORE INSERT ON trigger_test
FOR EACH ROW EXECUTE PROCEDURE stupid1();
INSERT INTO trigger_test VALUES (1, 'one');
ERROR:  unexpected return value from trigger procedure
DETAIL:  Expected None or a string.
CONTEXT:  PL/Python function "stupid1"
DROP TRIGGER stupid_trigger1 ON trigger_test;
-- returning MODIFY from DELETE trigger
CREATE FUNCTION stupid2() RETURNS trigger
AS $$
    return "MODIFY"
$$ LANGUAGE plpythonu;
CREATE TRIGGER stupid_trigger2
BEFORE DELETE ON trigger_test
FOR EACH ROW EXECUTE PROCEDURE stupid2();
DELETE FROM trigger_test WHERE i = 0;
WARNING:  PL/Python trigger function returned "MODIFY" in a DELETE trigger -- ignored
DROP TRIGGER stupid_trigger2 ON trigger_test;
INSERT INTO trigger_test VALUES (0, 'zero');
-- returning unrecognized string from trigger function
CREATE FUNCTION stupid3() RETURNS trigger
AS $$
    return "foo"
$$ LANGUAGE plpythonu;
CREATE TRIGGER stupid_trigger3
BEFORE UPDATE ON trigger_test
FOR EACH ROW EXECUTE PROCEDURE stupid3();
UPDATE trigger_test SET v = 'null' WHERE i = 0;
ERROR:  unexpected return value from trigger procedure
DETAIL:  Expected None, "OK", "SKIP", or "MODIFY".
CONTEXT:  PL/Python function "stupid3"
DROP TRIGGER stupid_trigger3 ON trigger_test;
-- Unicode variant
CREATE FUNCTION stupid3u() RETURNS trigger
AS $$
    return u"foo"
$$ LANGUAGE plpythonu;
CREATE TRIGGER stupid_trigger3
BEFORE UPDATE ON trigger_test
FOR EACH ROW EXECUTE PROCEDURE stupid3u();
UPDATE trigger_test SET v = 'null' WHERE i = 0;
ERROR:  unexpected return value from trigger procedure
DETAIL:  Expected None, "OK", "SKIP", or "MODIFY".
CONTEXT:  PL/Python function "stupid3u"
DROP TRIGGER stupid_trigger3 ON trigger_test;
-- deleting the TD dictionary
CREATE FUNCTION stupid4() RETURNS trigger
AS $$
    del TD["new"]
    return "MODIFY";
$$ LANGUAGE plpythonu;
CREATE TRIGGER stupid_trigger4
BEFORE UPDATE ON trigger_test
FOR EACH ROW EXECUTE PROCEDURE stupid4();
UPDATE trigger_test SET v = 'null' WHERE i = 0;
ERROR:  TD["new"] deleted, cannot modify row
CONTEXT:  while modifying trigger row
PL/Python function "stupid4"
DROP TRIGGER stupid_trigger4 ON trigger_test;
-- TD not a dictionary
CREATE FUNCTION stupid5() RETURNS trigger
AS $$
    TD["new"] = ['foo', 'bar']
    return "MODIFY";
$$ LANGUAGE plpythonu;
CREATE TRIGGER stupid_trigger5
BEFORE UPDATE ON trigger_test
FOR EACH ROW EXECUTE PROCEDURE stupid5();
UPDATE trigger_test SET v = 'null' WHERE i = 0;
ERROR:  TD["new"] is not a dictionary
CONTEXT:  while modifying trigger row
PL/Python function "stupid5"
DROP TRIGGER stupid_trigger5 ON trigger_test;
-- TD not having string keys
CREATE FUNCTION stupid6() RETURNS trigger
AS $$
    TD["new"] = {1: 'foo', 2: 'bar'}
    return "MODIFY";
$$ LANGUAGE plpythonu;
CREATE TRIGGER stupid_trigger6
BEFORE UPDATE ON trigger_test
FOR EACH ROW EXECUTE PROCEDURE stupid6();
UPDATE trigger_test SET v = 'null' WHERE i = 0;
ERROR:  TD["new"] dictionary key at ordinal position 0 is not a string
CONTEXT:  while modifying trigger row
PL/Python function "stupid6"
DROP TRIGGER stupid_trigger6 ON trigger_test;
-- TD keys not corresponding to row columns
CREATE FUNCTION stupid7() RETURNS trigger
AS $$
    TD["new"] = {'v': 'foo', 'a': 'bar'}
    return "MODIFY";
$$ LANGUAGE plpythonu;
CREATE TRIGGER stupid_trigger7
BEFORE UPDATE ON trigger_test
FOR EACH ROW EXECUTE PROCEDURE stupid7();
UPDATE trigger_test SET v = 'null' WHERE i = 0;
ERROR:  key "a" found in TD["new"] does not exist as a column in the triggering row
CONTEXT:  while modifying trigger row
PL/Python function "stupid7"
DROP TRIGGER stupid_trigger7 ON trigger_test;
-- Unicode variant
CREATE FUNCTION stupid7u() RETURNS trigger
AS $$
    TD["new"] = {u'v': 'foo', u'a': 'bar'}
    return "MODIFY"
$$ LANGUAGE plpythonu;
CREATE TRIGGER stupid_trigger7
BEFORE UPDATE ON trigger_test
FOR EACH ROW EXECUTE PROCEDURE stupid7u();
UPDATE trigger_test SET v = 'null' WHERE i = 0;
ERROR:  key "a" found in TD["new"] does not exist as a column in the triggering row
CONTEXT:  while modifying trigger row
PL/Python function "stupid7u"
DROP TRIGGER stupid_trigger7 ON trigger_test;
-- calling a trigger function directly
SELECT stupid7();
ERROR:  trigger functions can only be called as triggers
--
-- Null values
--
SELECT * FROM trigger_test;
 i |  v   
---+------
 0 | zero
(1 row)

CREATE FUNCTION test_null() RETURNS trigger
AS $$
    TD["new"]['v'] = None
    return "MODIFY"
$$ LANGUAGE plpythonu;
CREATE TRIGGER test_null_trigger
BEFORE UPDATE ON trigger_test
FOR EACH ROW EXECUTE PROCEDURE test_null();
UPDATE trigger_test SET v = 'null' WHERE i = 0;
DROP TRIGGER test_null_trigger ON trigger_test;
SELECT * FROM trigger_test;
 i | v 
---+---
 0 | 
(1 row)

--
-- Test that triggers honor typmod when assigning to tuple fields,
-- as per an early 9.0 bug report
--
SET DateStyle = 'ISO';
CREATE FUNCTION set_modif_time() RETURNS trigger AS $$
    TD['new']['modif_time'] = '2010-10-13 21:57:28.930486'
    return 'MODIFY'
$$ LANGUAGE plpythonu;
-- Add 'DISTRIBUTED RANDOMLY' to avoid "ERROR:  Cannot parallelize an UPDATE statement that updates the distribution columns"
CREATE TABLE pb (a TEXT, modif_time TIMESTAMP(0) WITHOUT TIME ZONE) DISTRIBUTED RANDOMLY;
CREATE TRIGGER set_modif_time BEFORE UPDATE ON pb
  FOR EACH ROW EXECUTE PROCEDURE set_modif_time();
INSERT INTO pb VALUES ('a', '2010-10-09 21:57:33.930486');
SELECT * FROM pb;
 a |     modif_time      
---+---------------------
 a | 2010-10-09 21:57:34
(1 row)

UPDATE pb SET a = 'b';
SELECT * FROM pb;
 a |     modif_time      
---+---------------------
 b | 2010-10-13 21:57:29
(1 row)

-- triggers for tables with composite types
CREATE TABLE comp1 (i integer, j boolean);
CREATE TYPE comp2 AS (k integer, l boolean);
CREATE TABLE composite_trigger_test (f1 comp1, f2 comp2);
CREATE FUNCTION composite_trigger_f() RETURNS trigger AS $$
    TD['new']['f1'] = (3, False)
    TD['new']['f2'] = {'k': 7, 'l': 'yes', 'ignored': 10}
    return 'MODIFY'
$$ LANGUAGE plpythonu;
CREATE TRIGGER composite_trigger BEFORE INSERT ON composite_trigger_test
  FOR EACH ROW EXECUTE PROCEDURE composite_trigger_f();
INSERT INTO composite_trigger_test VALUES (NULL, NULL);
SELECT * FROM composite_trigger_test;
  f1   |  f2   
-------+-------
 (3,f) | (7,t)
(1 row)

-- triggers with composite type columns (bug #6559)
CREATE TABLE composite_trigger_noop_test (f1 comp1, f2 comp2);
CREATE FUNCTION composite_trigger_noop_f() RETURNS trigger AS $$
    return 'MODIFY'
$$ LANGUAGE plpythonu;
CREATE TRIGGER composite_trigger_noop BEFORE INSERT ON composite_trigger_noop_test
  FOR EACH ROW EXECUTE PROCEDURE composite_trigger_noop_f();
INSERT INTO composite_trigger_noop_test VALUES (NULL, NULL);
INSERT INTO composite_trigger_noop_test VALUES (ROW(1, 'f'), NULL);
INSERT INTO composite_trigger_noop_test VALUES (ROW(NULL, 't'), ROW(1, 'f'));
SELECT * FROM composite_trigger_noop_test;
  f1   |  f2   
-------+-------
       | 
 (1,f) | 
 (,t)  | (1,f)
(3 rows)

-- nested composite types
CREATE TYPE comp3 AS (c1 comp1, c2 comp2, m integer);
CREATE TABLE composite_trigger_nested_test(c comp3);
CREATE FUNCTION composite_trigger_nested_f() RETURNS trigger AS $$
    return 'MODIFY'
$$ LANGUAGE plpythonu;
CREATE TRIGGER composite_trigger_nested BEFORE INSERT ON composite_trigger_nested_test
  FOR EACH ROW EXECUTE PROCEDURE composite_trigger_nested_f();
INSERT INTO composite_trigger_nested_test VALUES (NULL);
INSERT INTO composite_trigger_nested_test VALUES (ROW(ROW(1, 'f'), NULL, 3));
INSERT INTO composite_trigger_nested_test VALUES (ROW(ROW(NULL, 't'), ROW(1, 'f'), NULL));
SELECT * FROM composite_trigger_nested_test;
         c         
-------------------
 
 ("(1,f)",,3)
 ("(,t)","(1,f)",)
(3 rows)

-- check that using a function as a trigger over two tables works correctly
CREATE FUNCTION trig1234() RETURNS trigger LANGUAGE plpythonu AS $$
    TD["new"]["data"] = '1234'
    return 'MODIFY'
$$;
CREATE TABLE a(data text);
CREATE TABLE b(data int); -- different type conversion
CREATE TRIGGER a_t BEFORE INSERT ON a FOR EACH ROW EXECUTE PROCEDURE trig1234();
CREATE TRIGGER b_t BEFORE INSERT ON b FOR EACH ROW EXECUTE PROCEDURE trig1234();
INSERT INTO a DEFAULT VALUES;
SELECT * FROM a;
 data 
------
 1234
(1 row)

DROP TABLE a;
INSERT INTO b DEFAULT VALUES;
SELECT * FROM b;
 data 
------
 1234
(1 row)

-- check that SQL run in trigger code can see transition tables
CREATE TABLE transition_table_test (id int, name text);
INSERT INTO transition_table_test VALUES (1, 'a');
CREATE FUNCTION transition_table_test_f() RETURNS trigger LANGUAGE plpythonu AS
$$
    rv = plpy.execute("SELECT * FROM old_table")
    assert(rv.nrows() == 1)
    plpy.info("old: " + str(rv[0]["id"]) + " -> " + rv[0]["name"])
    rv = plpy.execute("SELECT * FROM new_table")
    assert(rv.nrows() == 1)
    plpy.info("new: " + str(rv[0]["id"]) + " -> " + rv[0]["name"])
    return None
$$;
-- GPDB: this test doesn't work properly on GPDB, because statement triggers
-- are not fired.
CREATE TRIGGER a_t AFTER UPDATE ON transition_table_test
  REFERENCING OLD TABLE AS old_table NEW TABLE AS new_table
  FOR EACH STATEMENT EXECUTE PROCEDURE transition_table_test_f();
ERROR:  Triggers for statements are not yet supported
UPDATE transition_table_test SET name = 'b';
DROP TABLE transition_table_test;
DROP FUNCTION transition_table_test_f();
-- dealing with generated columns
CREATE FUNCTION generated_test_func1() RETURNS trigger
LANGUAGE plpythonu
AS $$
TD['new']['j'] = 5  # not allowed
return 'MODIFY'
$$;
CREATE TRIGGER generated_test_trigger1 BEFORE INSERT ON trigger_test_generated
FOR EACH ROW EXECUTE PROCEDURE generated_test_func1();
TRUNCATE trigger_test_generated;
INSERT INTO trigger_test_generated (i) VALUES (1);
ERROR:  cannot set generated column "j"
CONTEXT:  while modifying trigger row
PL/Python function "generated_test_func1"
SELECT * FROM trigger_test_generated;
 i | j 
---+---
(0 rows)

-- recursive call of a trigger mustn't corrupt TD (bug #18456)
CREATE TABLE recursive_trigger_test (a int, b int);
CREATE FUNCTION recursive_trigger_func() RETURNS trigger
LANGUAGE plpythonu
AS $$
if TD["event"] == "UPDATE":
    plpy.execute("INSERT INTO recursive_trigger_test VALUES (1, 2)")
    plpy.notice("TD[event] => " + str(TD["event"]) + ", expecting UPDATE");
else:
    plpy.notice("TD[event] => " + str(TD["event"]) + ", expecting INSERT");
return None
$$;
CREATE TRIGGER recursive_trigger_trig
  AFTER INSERT OR UPDATE ON recursive_trigger_test
  FOR EACH ROW EXECUTE PROCEDURE recursive_trigger_func();
INSERT INTO recursive_trigger_test VALUES (0, 0);
NOTICE:  TD[event] => INSERT, expecting INSERT
UPDATE recursive_trigger_test SET a = 11 WHERE b = 0;
ERROR:  UPDATE on distributed key column not allowed on relation with update triggers
SELECT * FROM recursive_trigger_test;
 a | b 
---+---
 0 | 0
(1 row)