# Copyright 2023 PingCAP, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Preparation.
mysql> drop table if exists test.t
mysql> create table test.t (a int, b int)
mysql> alter table test.t set tiflash replica 1
mysql> insert into test.t values(1,2),(2,1),(10,15),(15,10),(20,25),(25,10),(18,19),(19,18)
mysql> insert into test.t select a + 5, b + 5 from test.t
mysql> insert into test.t select a + 5, b + 5 from test.t
mysql> insert into test.t select a + 5, b + 5 from test.t
mysql> insert into test.t select a + 5, b + 5 from test.t
mysql> insert into test.t select a + 5, b + 5 from test.t
mysql> insert into test.t select a + 5, b + 5 from test.t
mysql> insert into test.t select a + 5, b + 5 from test.t
mysql> insert into test.t select a + 5, b + 5 from test.t
mysql> insert into test.t select a + 5, b + 5 from test.t

func> wait_table test t

mysql> use test; set @@tidb_enable_parallel_apply=0; set @@tidb_isolation_read_engines='tiflash'; set @@tidb_enforce_mpp=1; select count(*) from t where a > (select avg(b) from t t1 where t.a > t1.a);
+----------+
| count(*) |
+----------+
|     4094 |
+----------+

mysql> use test; set @@tidb_enable_parallel_apply=0; set @@tidb_isolation_read_engines='tiflash'; set @@tidb_enforce_mpp=1; select count(*) from t where a > (select a from t t1 where t.a > t1.a limit 1);
+----------+
| count(*) |
+----------+
|     4095 |
+----------+

mysql> use test; set @@tidb_enable_parallel_apply=1; set @@tidb_isolation_read_engines='tiflash'; set @@tidb_enforce_mpp=1; select count(*) from t where a > (select avg(b) from t t1 where t.a > t1.a);
+----------+
| count(*) |
+----------+
|     4094 |
+----------+

mysql> use test; set @@tidb_enable_parallel_apply=1; set @@tidb_isolation_read_engines='tiflash'; set @@tidb_enforce_mpp=1; select count(*) from t where a > (select a from t t1 where t.a > t1.a limit 1);
+----------+
| count(*) |
+----------+
|     4095 |
+----------+

# Clean up.
mysql> drop table if exists test.t