MDEV-6441: memory leak

mysql_derived_prepare() was executed on the statement memory.
Now it is executed on the runtime memory.
All bugs induced by this were fixed.

mysql-test/r/view.result

@@ -5302,6 +5302,61 @@ NULL	8
 drop view v1;
 drop table t1,t2,t3;
 SET optimizer_switch=@save_optimizer_switch_MDEV_3874;
+CREATE TABLE `t1` (
+`id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
+`f0` int(11) unsigned NOT NULL DEFAULT '0',
+`f1` int(11) unsigned NOT NULL DEFAULT '0',
+PRIMARY KEY (`id`),
+UNIQUE KEY `id` (`id`)
+);
+CREATE TABLE `t2` (
+`id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
+`f02` bigint(20) unsigned NOT NULL DEFAULT '0',
+`f03` int(11) unsigned NOT NULL DEFAULT '0',
+PRIMARY KEY (`id`),
+UNIQUE KEY `id` (`id`)
+);
+CREATE ALGORITHM=UNDEFINED SQL SECURITY DEFINER VIEW `v1` AS 
+SELECT 
+`t1`.`f0` AS `f0`,
+`t1`.`f1` AS `f1`,
+`t2`.`f02` AS `f02`,
+`t2`.`f03` AS `f03` 
+FROM 
+(`t1` LEFT JOIN `t2` ON((`t1`.`id` = `t2`.`f02`)));
+CREATE FUNCTION `f1`(
+p0 BIGINT(20) UNSIGNED
+)
+RETURNS bigint(20) unsigned
+DETERMINISTIC
+CONTAINS SQL
+SQL SECURITY DEFINER
+COMMENT ''
+BEGIN
+DECLARE k0 INTEGER UNSIGNED DEFAULT 0;
+DECLARE lResult INTEGER UNSIGNED DEFAULT 0;
+SET k0 = 0;
+WHILE k0 < 1 DO
+SELECT COUNT(*) as `f00` INTO lResult  FROM `v1` WHERE `v1`.`f0` = p0; -- BUG
+SET k0 = k0 + 1;
+END WHILE;
+RETURN(k0);
+END|
+SELECT `f1`(1);
+`f1`(1)
+1
+SELECT `f1`(1);
+`f1`(1)
+1
+SELECT `f1`(1);
+`f1`(1)
+1
+SELECT `f1`(1);
+`f1`(1)
+1
+DROP FUNCTION f1;
+DROP VIEW v1;
+DROP TABLE t1, t2;
 # -----------------------------------------------------------------
 # -- End of 5.5 tests.
 # -----------------------------------------------------------------

mysql-test/t/view.test

@@ -5231,6 +5231,69 @@ drop view v1;
 drop table t1,t2,t3;
 SET optimizer_switch=@save_optimizer_switch_MDEV_3874;
 
+#
+# MDEV-5515: sub-bug test of 3rd execution crash
+#
+
+CREATE TABLE `t1` (
+  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
+  `f0` int(11) unsigned NOT NULL DEFAULT '0',
+  `f1` int(11) unsigned NOT NULL DEFAULT '0',
+  PRIMARY KEY (`id`),
+  UNIQUE KEY `id` (`id`)
+);
+
+CREATE TABLE `t2` (
+  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
+  `f02` bigint(20) unsigned NOT NULL DEFAULT '0',
+  `f03` int(11) unsigned NOT NULL DEFAULT '0',
+  PRIMARY KEY (`id`),
+  UNIQUE KEY `id` (`id`)
+);
+
+CREATE ALGORITHM=UNDEFINED SQL SECURITY DEFINER VIEW `v1` AS 
+  SELECT 
+    `t1`.`f0` AS `f0`,
+    `t1`.`f1` AS `f1`,
+    `t2`.`f02` AS `f02`,
+    `t2`.`f03` AS `f03` 
+  FROM 
+    (`t1` LEFT JOIN `t2` ON((`t1`.`id` = `t2`.`f02`)));
+
+--delimiter |
+CREATE FUNCTION `f1`(
+        p0 BIGINT(20) UNSIGNED
+    )
+    RETURNS bigint(20) unsigned
+    DETERMINISTIC
+    CONTAINS SQL
+    SQL SECURITY DEFINER
+    COMMENT ''
+BEGIN
+
+DECLARE k0 INTEGER UNSIGNED DEFAULT 0;
+DECLARE lResult INTEGER UNSIGNED DEFAULT 0;
+
+ SET k0 = 0;
+ WHILE k0 < 1 DO
+    SELECT COUNT(*) as `f00` INTO lResult  FROM `v1` WHERE `v1`.`f0` = p0; -- BUG
+   SET k0 = k0 + 1;
+ END WHILE;
+
+  RETURN(k0);
+END|
+--delimiter ;
+
+
+SELECT `f1`(1);
+SELECT `f1`(1);
+SELECT `f1`(1);
+SELECT `f1`(1);
+
+DROP FUNCTION f1;
+DROP VIEW v1;
+DROP TABLE t1, t2;
+
 --echo # -----------------------------------------------------------------
 --echo # -- End of 5.5 tests.
 --echo # -----------------------------------------------------------------

sql/sql_derived.cc

@@ -614,6 +614,7 @@ bool mysql_derived_prepare(THD *thd, LEX *lex, TABLE_LIST *derived)
   SELECT_LEX_UNIT *unit= derived->get_unit();
   DBUG_ENTER("mysql_derived_prepare");
   bool res= FALSE;
+  DBUG_PRINT("enter", ("unit 0x%lx", (ulong) unit));
 
   // Skip already prepared views/DT
   if (!unit || unit->prepared ||
@@ -623,9 +624,6 @@ bool mysql_derived_prepare(THD *thd, LEX *lex, TABLE_LIST *derived)
           thd->lex->sql_command == SQLCOM_DELETE_MULTI))))
     DBUG_RETURN(FALSE);
 
-  Query_arena *arena, backup;
-  arena= thd->activate_stmt_arena_if_needed(&backup);
-
   SELECT_LEX *first_select= unit->first_select();
 
   /* prevent name resolving out of derived table */
@@ -743,8 +741,6 @@ exit:
     if (derived->outer_join)
       table->maybe_null= 1;
   }
-  if (arena)
-    thd->restore_active_arena(arena, &backup);
   DBUG_RETURN(res);
 }
 

sql/sql_lex.cc

@@ -3298,7 +3298,7 @@ static void fix_prepare_info_in_table_list(THD *thd, TABLE_LIST *tbl)
 {
   for (; tbl; tbl= tbl->next_local)
   {
-    if (tbl->on_expr)
+    if (tbl->on_expr && !tbl->prep_on_expr)
     {
       thd->check_and_register_item_tree(&tbl->prep_on_expr, &tbl->on_expr);
       tbl->on_expr= tbl->on_expr->copy_andor_structure(thd);

sql/table.cc

@@ -4140,7 +4140,8 @@ bool TABLE_LIST::create_field_translation(THD *thd)
 
   while ((item= it++))
   {
-    transl[field_count].name= item->name;
+    DBUG_ASSERT(item->name && item->name[0]);
+    transl[field_count].name= thd->strdup(item->name);
     transl[field_count++].item= item;
   }
   field_translation= transl;