Revert "MDEV-14786 Server crashes in Item_cond::transform on 2nd execution of...

Revert "MDEV-14786 Server crashes in Item_cond::transform on 2nd execution of SP querying from a view [fixes #436]"

This reverts commit 7069071d

And add a test to show that optimization steps that
a) are repeated for every execution
b) create new items
cannot be done on the statement arena

mysql-test/r/sp-big.result

-drop procedure if exists test.longprocedure;
-drop table if exists t1;
 create table t1 (a int);
 insert into t1 values (1),(2),(3);
 length
@@ -60,3 +58,30 @@ f1
 This is a test case for for Bug#9819
 drop procedure p1;
 drop table t1, t2;
+create table t1 (
+`id1` int unsigned not null default '0',
+`id2` int unsigned not null default '0',
+`link_type` int unsigned not null default '0',
+`visibility` tinyint not null default '0',
+`data` varchar(255) not null default '',
+`time` int unsigned not null default '0',
+`version` int unsigned not null default '0',
+primary key (id1, link_type, visibility, id2)
+) default collate=latin1_bin;
+create procedure select_test()
+begin
+declare id1_cond int;
+set id1_cond = 1;
+while id1_cond <= 10000 do
+select count(*) as cnt from (select id1 from t1 force index (primary) where id1 = id1_cond and link_type = 1 and visibility = 1 order by id2 desc) as t into @cnt;
+set id1_cond = id1_cond + 1;
+end while;
+end//
+insert t1 select seq, seq, 1, 1, seq, seq, seq from seq_1_to_2000;
+set @before=unix_timestamp();
+call select_test();
+select unix_timestamp() - @before < 60;
+unix_timestamp() - @before < 60
+1
+drop procedure select_test;
+drop table t1;

mysql-test/t/sp-big.test

 #
 # Bug #11602: SP with very large body not handled well
 #
-
---disable_warnings
-drop procedure if exists test.longprocedure;
-drop table if exists t1;
---enable_warnings
+source include/have_sequence.inc;
 
 create table t1 (a int);
 insert into t1 values (1),(2),(3);
@@ -85,3 +81,37 @@ select f1 from t1 limit 1;
 select f1 from t2 limit 1;
 drop procedure p1;
 drop table t1, t2;
+
+#
+# Loops with many iterations
+# (Item_equal must be created in the execution arena)
+#
+create table t1 (
+  `id1` int unsigned not null default '0',
+  `id2` int unsigned not null default '0',
+  `link_type` int unsigned not null default '0',
+  `visibility` tinyint not null default '0',
+  `data` varchar(255) not null default '',
+  `time` int unsigned not null default '0',
+  `version` int unsigned not null default '0',
+  primary key (id1, link_type, visibility, id2)
+) default collate=latin1_bin;
+
+delimiter //;
+create procedure select_test()
+begin
+ declare id1_cond int;
+ set id1_cond = 1;
+ while id1_cond <= 10000 do
+   select count(*) as cnt from (select id1 from t1 force index (primary) where id1 = id1_cond and link_type = 1 and visibility = 1 order by id2 desc) as t into @cnt;
+   set id1_cond = id1_cond + 1;
+ end while;
+end//
+delimiter ;//
+
+insert t1 select seq, seq, 1, 1, seq, seq, seq from seq_1_to_2000;
+set @before=unix_timestamp();
+call select_test();
+select unix_timestamp() - @before < 60;
+drop procedure select_test;
+drop table t1;

sql/sql_select.cc

@@ -14677,8 +14677,6 @@ static COND* substitute_for_best_equal_field(THD *thd, JOIN_TAB *context_tab,
   Item_equal *item_equal;
   COND *org_cond= cond;                 // Return this in case of fatal error
 
-  Query_arena_stmt on_stmt_arena(thd);
-
   if (cond->type() == Item::COND_ITEM)
   {
     List<Item> *cond_list= ((Item_cond*) cond)->argument_list();
@@ -15800,8 +15798,6 @@ optimize_cond(JOIN *join, COND *conds,
   THD *thd= join->thd;
   DBUG_ENTER("optimize_cond");
 
-  Query_arena_stmt on_stmt_arena(thd);
-
   if (!conds)
   {
     *cond_value= Item::COND_TRUE;