Reduce shard_count to reduce drain_node execution time (#6128)

master_drain_node in distributed_triggers.sql test file takes too
long to execute. It is directly dependent on the shard count.
Hence I reduced shard count from 32 to 4 (default in tests),
since this doesn't affect the validity of the tests.

src/test/regress/expected/distributed_triggers.out

@@ -4,7 +4,6 @@ NOTICE:  schema "distributed_triggers" does not exist, skipping
 CREATE SCHEMA distributed_triggers;
 SET search_path TO 'distributed_triggers';
 SET citus.shard_replication_factor = 1;
-SET citus.shard_count = 32;
 SET citus.next_shard_id TO 800000;
 --
 -- Test citus.enable_unsafe_triggers
@@ -211,8 +210,8 @@ SELECT tgrelid::regclass::text, tgname FROM pg_trigger WHERE tgname like 'record
 SELECT run_command_on_workers($$SELECT count(*) FROM pg_trigger WHERE tgname like 'record_change_trigger%';$$);
  run_command_on_workers
 ---------------------------------------------------------------------
- (localhost,57637,t,17)
- (localhost,57638,t,17)
+ (localhost,57637,t,3)
+ (localhost,57638,t,3)
 (2 rows)
 
 ALTER TRIGGER "record_change_trigger" ON "distributed_triggers"."data" RENAME TO "new_record_change_trigger";
@@ -237,8 +236,8 @@ SELECT run_command_on_workers($$SELECT count(*) FROM pg_trigger WHERE tgname lik
 SELECT run_command_on_workers($$SELECT count(*) FROM pg_trigger WHERE tgname like 'new_record_change_trigger%';$$);
  run_command_on_workers
 ---------------------------------------------------------------------
- (localhost,57637,t,17)
- (localhost,57638,t,17)
+ (localhost,57637,t,3)
+ (localhost,57638,t,3)
 (2 rows)
 
 --This should fail
@@ -505,7 +504,7 @@ $rec_audit$ LANGUAGE plpgsql;
 CREATE TRIGGER record_emp_trig
 AFTER INSERT OR UPDATE OR DELETE ON emptest
     FOR EACH STATEMENT EXECUTE FUNCTION distributed_triggers.record_emp();
-INSERT INTO emptest VALUES ('test5', 1);
+INSERT INTO emptest VALUES ('test6', 1);
 ERROR:  cannot execute a distributed query from a query on a shard
 DETAIL:  Executing a distributed query in a function call that may be pushed to a remote node can lead to incorrect results.
 HINT:  Avoid nesting of distributed queries or use alter user current_user set citus.allow_nested_distributed_execution to on to allow it with possible incorrectness.
@@ -776,48 +775,6 @@ NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
 NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
 NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
 NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
-NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
 NOTICE:  Moving shard xxxxx from localhost:xxxxx to localhost:xxxxx ...
  master_drain_node
 ---------------------------------------------------------------------
@@ -862,7 +819,7 @@ SELECT tgrelid::regclass::text, tgname FROM pg_trigger WHERE tgname like 'insert
 SELECT run_command_on_workers($$SELECT count(*) FROM pg_trigger WHERE tgname like 'insert_99_trigger%'$$);
  run_command_on_workers
 ---------------------------------------------------------------------
- (localhost,57637,t,33)
+ (localhost,57637,t,5)
 (1 row)
 
 INSERT INTO distributed_table VALUES (99);
@@ -898,7 +855,7 @@ SELECT tgrelid::regclass::text, tgname FROM pg_trigger WHERE tgname like 'insert
 SELECT run_command_on_workers($$SELECT count(*) FROM pg_trigger WHERE tgname like 'insert_99_trigger%'$$);
  run_command_on_workers
 ---------------------------------------------------------------------
- (localhost,57637,t,33)
+ (localhost,57637,t,5)
  (localhost,57638,t,1)
 (2 rows)
 

src/test/regress/sql/distributed_triggers.sql

@@ -3,7 +3,6 @@ DROP SCHEMA IF EXISTS distributed_triggers CASCADE;
 CREATE SCHEMA distributed_triggers;
 SET search_path TO 'distributed_triggers';
 SET citus.shard_replication_factor = 1;
-SET citus.shard_count = 32;
 SET citus.next_shard_id TO 800000;
 
 --
@@ -302,7 +301,7 @@ CREATE TRIGGER record_emp_trig
 AFTER INSERT OR UPDATE OR DELETE ON emptest
     FOR EACH STATEMENT EXECUTE FUNCTION distributed_triggers.record_emp();
 
-INSERT INTO emptest VALUES ('test5', 1);
+INSERT INTO emptest VALUES ('test6', 1);
 DELETE FROM emptest;
 SELECT * FROM emptest;
 SELECT operation_type FROM record_op;