Make new triggers tests more robust

Add explicit collation on the trigger name to avoid locale dependencies.
Also restrict the tables selected, to avoid interference from
concurrently running tests.

src/test/regress/expected/triggers.out

@@ -99,7 +99,9 @@ NOTICE:  check_pkeys_fkey_cascade: 1 tuple(s) of fkeys2 are deleted
 SELECT trigger_name, event_manipulation, event_object_schema, event_object_table,
        action_order, action_condition, action_orientation, action_timing,
        action_reference_old_table, action_reference_new_table
-  FROM information_schema.triggers ORDER BY 1, 2;
+  FROM information_schema.triggers
+  WHERE event_object_table in ('pkeys', 'fkeys', 'fkeys2')
+  ORDER BY trigger_name COLLATE "C", 2;
         trigger_name        | event_manipulation | event_object_schema | event_object_table | action_order | action_condition | action_orientation | action_timing | action_reference_old_table | action_reference_new_table 
 ----------------------------+--------------------+---------------------+--------------------+--------------+------------------+--------------------+---------------+----------------------------+----------------------------
  check_fkeys2_fkey_restrict | DELETE             | public              | fkeys2             |            1 |                  | ROW                | BEFORE        |                            | 
@@ -368,7 +370,9 @@ FOR EACH STATEMENT WHEN (true) EXECUTE PROCEDURE trigger_func('delete_when');
 SELECT trigger_name, event_manipulation, event_object_schema, event_object_table,
        action_order, action_condition, action_orientation, action_timing,
        action_reference_old_table, action_reference_new_table
-  FROM information_schema.triggers ORDER BY 1, 2;
+  FROM information_schema.triggers
+  WHERE event_object_table IN ('main_table')
+  ORDER BY trigger_name COLLATE "C", 2;
      trigger_name     | event_manipulation | event_object_schema | event_object_table | action_order |        action_condition        | action_orientation | action_timing | action_reference_old_table | action_reference_new_table 
 ----------------------+--------------------+---------------------+--------------------+--------------+--------------------------------+--------------------+---------------+----------------------------+----------------------------
  after_ins_stmt_trig  | INSERT             | public              | main_table         |            1 |                                | STATEMENT          | AFTER         |                            | 
@@ -2030,16 +2034,11 @@ create trigger child3_delete_trig
 SELECT trigger_name, event_manipulation, event_object_schema, event_object_table,
        action_order, action_condition, action_orientation, action_timing,
        action_reference_old_table, action_reference_new_table
-  FROM information_schema.triggers ORDER BY 1, 2;
+  FROM information_schema.triggers
+  WHERE event_object_table IN ('parent', 'child1', 'child2', 'child3')
+  ORDER BY trigger_name COLLATE "C", 2;
     trigger_name    | event_manipulation | event_object_schema | event_object_table | action_order | action_condition | action_orientation | action_timing | action_reference_old_table | action_reference_new_table 
-------------------------+--------------------+---------------------+--------------------+--------------+------------------+--------------------+---------------+----------------------------+----------------------------
- after_ins_stmt_trig    | INSERT             | public              | main_table         |            1 |                  | STATEMENT          | AFTER         |                            | 
- after_upd_a_b_row_trig | UPDATE             | public              | main_table         |            1 |                  | ROW                | AFTER         |                            | 
- after_upd_b_row_trig   | UPDATE             | public              | main_table         |            2 |                  | ROW                | AFTER         |                            | 
- after_upd_b_stmt_trig  | UPDATE             | public              | main_table         |            1 |                  | STATEMENT          | AFTER         |                            | 
- after_upd_stmt_trig    | UPDATE             | public              | main_table         |            2 |                  | STATEMENT          | AFTER         |                            | 
- before_ins_stmt_trig   | INSERT             | public              | main_table         |            1 |                  | STATEMENT          | BEFORE        |                            | 
- before_upd_a_stmt_trig | UPDATE             | public              | main_table         |            1 |                  | STATEMENT          | BEFORE        |                            | 
+--------------------+--------------------+---------------------+--------------------+--------------+------------------+--------------------+---------------+----------------------------+----------------------------
  child1_delete_trig | DELETE             | public              | child1             |            1 |                  | STATEMENT          | AFTER         | old_table                  | 
  child1_insert_trig | INSERT             | public              | child1             |            1 |                  | STATEMENT          | AFTER         |                            | new_table
  child1_update_trig | UPDATE             | public              | child1             |            1 |                  | STATEMENT          | AFTER         | old_table                  | new_table
@@ -2052,7 +2051,7 @@ SELECT trigger_name, event_manipulation, event_object_schema, event_object_table
  parent_delete_trig | DELETE             | public              | parent             |            1 |                  | STATEMENT          | AFTER         | old_table                  | 
  parent_insert_trig | INSERT             | public              | parent             |            1 |                  | STATEMENT          | AFTER         |                            | new_table
  parent_update_trig | UPDATE             | public              | parent             |            1 |                  | STATEMENT          | AFTER         | old_table                  | new_table
-(19 rows)
+(12 rows)
 
 -- insert directly into children sees respective child-format tuples
 insert into child1 values ('AAA', 42);

src/test/regress/sql/triggers.sql

@@ -95,7 +95,9 @@ update pkeys set pkey1 = 7, pkey2 = '70' where pkey1 = 10 and pkey2 = '1';
 SELECT trigger_name, event_manipulation, event_object_schema, event_object_table,
        action_order, action_condition, action_orientation, action_timing,
        action_reference_old_table, action_reference_new_table
-  FROM information_schema.triggers ORDER BY 1, 2;
+  FROM information_schema.triggers
+  WHERE event_object_table in ('pkeys', 'fkeys', 'fkeys2')
+  ORDER BY trigger_name COLLATE "C", 2;
 
 DROP TABLE pkeys;
 DROP TABLE fkeys;
@@ -287,7 +289,9 @@ FOR EACH STATEMENT WHEN (true) EXECUTE PROCEDURE trigger_func('delete_when');
 SELECT trigger_name, event_manipulation, event_object_schema, event_object_table,
        action_order, action_condition, action_orientation, action_timing,
        action_reference_old_table, action_reference_new_table
-  FROM information_schema.triggers ORDER BY 1, 2;
+  FROM information_schema.triggers
+  WHERE event_object_table IN ('main_table')
+  ORDER BY trigger_name COLLATE "C", 2;
 INSERT INTO main_table (a) VALUES (123), (456);
 COPY main_table FROM stdin;
 123	999
@@ -1484,7 +1488,9 @@ create trigger child3_delete_trig
 SELECT trigger_name, event_manipulation, event_object_schema, event_object_table,
        action_order, action_condition, action_orientation, action_timing,
        action_reference_old_table, action_reference_new_table
-  FROM information_schema.triggers ORDER BY 1, 2;
+  FROM information_schema.triggers
+  WHERE event_object_table IN ('parent', 'child1', 'child2', 'child3')
+  ORDER BY trigger_name COLLATE "C", 2;
 
 -- insert directly into children sees respective child-format tuples
 insert into child1 values ('AAA', 42);