添加regression case test for concurrent update

src/test/regress/expected/on_update_session1.out

@@ -0,0 +1,25 @@
+create database mysql_test dbcompatibility 'B';
+\c mysql_test
+create table tb666(c1 timestamp default current_timestamp on update current_timestamp, c2 int, c3 timestamp generated always as(c1+c2) stored);
+insert into tb666 values(default, 1);
+select * from tb666;
+               c1               | c2 |               c3               
+--------------------------------+----+--------------------------------
+--?.*
+(1 row)
+
+begin;
+update tb666 set c2 = 2;
+select * from tb666;
+               c1                | c2 |               c3               
+---------------------------------+----+--------------------------------
+--?.*
+(1 row)
+
+select pg_sleep(2);
+ pg_sleep 
+----------
+ 
+(1 row)
+
+commit;

src/test/regress/expected/on_update_session2.out

@@ -0,0 +1,14 @@
+select pg_sleep(2);
+ pg_sleep 
+----------
+ 
+(1 row)
+
+\c mysql_test
+update tb666 set c2 = 3;
+select * from tb666;
+               c1                | c2 |               c3                
+---------------------------------+----+---------------------------------
+--?.*
+(1 row)
+

src/test/regress/parallel_schedule0

@@ -1088,3 +1088,5 @@ test: user_host_test
 
 # test for new_expr_by_flatten
 test: enable_expr_fusion_flatten
+# test for on update timestamp and generated column
+test: on_update_session1 on_update_session2

src/test/regress/sql/on_update_session1.sql

@@ -0,0 +1,10 @@
+create database mysql_test dbcompatibility 'B';
+\c mysql_test
+create table tb666(c1 timestamp default current_timestamp on update current_timestamp, c2 int, c3 timestamp generated always as(c1+c2) stored);
+insert into tb666 values(default, 1);
+select * from tb666;
+begin;
+update tb666 set c2 = 2;
+select * from tb666;
+select pg_sleep(2);
+commit;

src/test/regress/sql/on_update_session2.sql

@@ -0,0 +1,4 @@
+select pg_sleep(2);
+\c mysql_test
+update tb666 set c2 = 3;
+select * from tb666;