MDEV-31003: Second execution for ps-protocol

This patch adds for "--ps-protocol" second execution
of queries "SELECT".
Also in this patch it is added ability to disable/enable
(--disable_ps2_protocol/--enable_ps2_protocol) second
execution for "--ps-prototocol" in testcases.

mysql-test/main/join_outer.test

@@ -685,9 +685,15 @@ create table t1 (a int, b varchar(20));
 create table t2 (a int, c varchar(20));
 insert into t1 values (1,"aaaaaaaaaa"),(2,"bbbbbbbbbb");
 insert into t2 values (1,"cccccccccc"),(2,"dddddddddd");
+#Enable after fix MDEV-31276
+--disable_ps2_protocol
 select group_concat(t1.b,t2.c) from t1 left join t2 using(a) group by t1.a;
+--enable_ps2_protocol
 select group_concat(t1.b,t2.c) from t1 inner join t2 using(a) group by t1.a;
+#Enable after fix MDEV-31276
+--disable_ps2_protocol
 select group_concat(t1.b,t2.c) from t1 left join t2 using(a) group by a;
+--enable_ps2_protocol
 select group_concat(t1.b,t2.c) from t1 inner join t2 using(a) group by a;
 drop table t1, t2;
 set group_concat_max_len=default;
@@ -873,7 +879,8 @@ DROP TABLE t1,t2;
 #
 # Bug 28188: 'not exists' optimization for outer joins 
 #
- 
+
+--disable_ps2_protocol
 CREATE TABLE t1 (id int PRIMARY KEY, a varchar(8));
 CREATE TABLE t2 (id int NOT NULL, b int NOT NULL, INDEX idx(id));
 INSERT INTO t1 VALUES
@@ -889,7 +896,7 @@ SELECT t1.id, a FROM t1 LEFT JOIN t2 ON t1.id=t2.id WHERE t2.b IS NULL;
 show status like 'Handler_read%';
 
 DROP TABLE t1,t2;
-
+--enable_ps2_protocol
 #
 # Bug 28571: outer join with false on condition over constant tables 
 #
@@ -1369,6 +1376,7 @@ drop table t1,t2,t3,t4;
 --echo # Bug#57024: Poor performance when conjunctive condition over the outer 
 --echo #            table is used in the on condition of an outer join
 --echo # 
+--disable_ps2_protocol
 --disable_view_protocol
 create table t1 (a int);
 insert into t1 values (NULL), (NULL), (NULL), (NULL);
@@ -1411,6 +1419,7 @@ show status like "handler_read%";
 
 drop table t1,t2,t3;
 --enable_view_protocol
+--enable_ps2_protocol
 
 --echo #
 --echo # Bug#57688 Assertion `!table || (!table->write_set || bitmap_is_set(table->write_set, field
@@ -2363,8 +2372,11 @@ create view v1 as select * from t1
   left join ( select 'Y' AS Voted, ElectionID from t2 ) AS T 
     on T.ElectionID = t1.Election
 limit 9;
+#enable after fix MDEV-31277
+--disable_ps2_protocol
 # limit X causes merge algorithm select as opposed to temp table
 select * from v1;
+--enable_ps2_protocol
 drop table t1, t2;
 drop view v1;
 
@@ -2379,7 +2391,10 @@ create view v10 as select *, 'U' as u from t10 left join (select 'Y' as y, t20.b
 create table t30 (c int);
 insert into t30 values (1),(3);
 create view v20 as select * from t30 left join (select 'X' as x, v10.u, v10.y, v10.b from v10) dt2 on t30.c=dt2.b limit 6;
+#check after fix MDEV-31277
+--disable_ps2_protocol
 select * from v20 limit 9;
+--enable_ps2_protocol
 drop view v10, v20;
 drop table t10, t20, t30;
 
@@ -2392,7 +2407,9 @@ create table t3 (c int);
 insert into t3 values (3),(1);
 create table t1 (a int);
 insert into t1 values (1),(2),(7),(1);
- 
+
+#check after fix MDEV-31277
+--disable_ps2_protocol
 select * from
 (
   select * from
@@ -2405,6 +2422,7 @@ select * from
     on dt1.a=dt2.b
   limit 9
 ) dt;
+--enable_ps2_protocol
 
 ## Same as dt3 above
 create view v3(x,c) as select * from (select 'X' as x, t3.c from t3) dt3;
@@ -2418,7 +2436,10 @@ create view v0(y,b,x,c) as select * from v2 left join v3 on v2.b=v3.c;
 # Same as above select statement
 create view v1 as  select 'Z' as z, t1.a, v0.*  from t1 left join v0 on t1.a=v0.b limit 9;
 
+#check after fix MDEV-31277
+--disable_ps2_protocol
 select * from v1;
+--enable_ps2_protocol
 
 set statement join_cache_level=0 for
 select * from v1;