Merge mysql.com:/opt/local/work/mysql-4.1-11458

into  mysql.com:/opt/local/work/mysql-5.0-root


sql/mysql_priv.h:
  Auto merged
sql/sql_lex.h:
  Auto merged
mysql-test/r/ps.result:
  Manual merge.
mysql-test/t/ps.test:
  Manual merge.
sql/item.cc:
  Manual merge.
sql/item.h:
  Manual merge.
sql/item_subselect.h:
  Manual merge.
sql/sql_parse.cc:
  Manual merge.
sql/sql_prepare.cc:
  Manual merge.

mysql-test/r/ps.result

@@ -681,3 +681,60 @@ execute stmt;
 execute stmt;
 deallocate prepare stmt;
 drop table t1;
+create table t1 (
+id int(11) unsigned not null primary key auto_increment,
+partner_id varchar(35) not null,
+t1_status_id int(10) unsigned
+);
+insert into t1 values ("1", "partner1", "10"), ("2", "partner2", "10"),
+("3", "partner3", "10"), ("4", "partner4", "10");
+create table t2 (
+id int(11) unsigned not null default '0',
+t1_line_id int(11) unsigned not null default '0',
+article_id varchar(20),
+sequence int(11) not null default '0',
+primary key  (id,t1_line_id)
+);
+insert into t2 values ("1", "1", "sup", "0"), ("2", "1", "sup", "1"),
+("2", "2", "sup", "2"), ("2", "3", "sup", "3"),
+("2", "4", "imp", "4"), ("3", "1", "sup", "0"),
+("4", "1", "sup", "0");
+create table t3 (
+id int(11) not null default '0',
+preceeding_id int(11) not null default '0',
+primary key  (id,preceeding_id)
+);
+create table t4 (
+user_id varchar(50) not null,
+article_id varchar(20) not null,
+primary key  (user_id,article_id)
+);
+insert into t4 values("nicke", "imp");
+prepare stmt from
+'select distinct t1.partner_id
+from t1 left join t3 on t1.id = t3.id
+     left join t1 pp on pp.id = t3.preceeding_id
+where
+  exists (
+    select *
+    from t2 as pl_inner
+    where pl_inner.id = t1.id
+    and pl_inner.sequence <= (
+      select min(sequence) from t2 pl_seqnr
+      where pl_seqnr.id = t1.id
+    )
+    and exists (
+      select * from t4
+      where t4.article_id = pl_inner.article_id
+      and t4.user_id = ?
+    )
+  )
+  and t1.id = ?
+group by t1.id
+having count(pp.id) = 0';
+set @user_id = 'nicke';
+set @id = '2';
+execute stmt using @user_id, @id;
+partner_id
+execute stmt using @user_id, @id;
+partner_id

mysql-test/t/ps.test

@@ -705,3 +705,71 @@ execute stmt;
 execute stmt;
 deallocate prepare stmt;
 drop table t1;
+#
+# Bug#11458 "Prepared statement with subselects return random data":
+# drop PARAM_TABLE_BIT from the list of tables used by a subquery
+#
+create table t1 (
+  id int(11) unsigned not null primary key auto_increment,
+  partner_id varchar(35) not null,
+  t1_status_id int(10) unsigned
+);
+
+insert into t1 values ("1", "partner1", "10"), ("2", "partner2", "10"),
+                      ("3", "partner3", "10"), ("4", "partner4", "10");
+
+create table t2 (
+  id int(11) unsigned not null default '0',
+  t1_line_id int(11) unsigned not null default '0',
+  article_id varchar(20),
+  sequence int(11) not null default '0',
+  primary key  (id,t1_line_id)
+);
+
+insert into t2 values ("1", "1", "sup", "0"), ("2", "1", "sup", "1"),
+                      ("2", "2", "sup", "2"), ("2", "3", "sup", "3"),
+                      ("2", "4", "imp", "4"), ("3", "1", "sup", "0"),
+                      ("4", "1", "sup", "0");
+
+create table t3 (
+  id int(11) not null default '0',
+  preceeding_id int(11) not null default '0',
+  primary key  (id,preceeding_id)
+);
+
+create table t4 (
+  user_id varchar(50) not null,
+  article_id varchar(20) not null,
+  primary key  (user_id,article_id)
+);
+
+insert into t4 values("nicke", "imp");
+
+prepare stmt from
+'select distinct t1.partner_id
+from t1 left join t3 on t1.id = t3.id
+     left join t1 pp on pp.id = t3.preceeding_id
+where
+  exists (
+    select *
+    from t2 as pl_inner
+    where pl_inner.id = t1.id
+    and pl_inner.sequence <= (
+      select min(sequence) from t2 pl_seqnr
+      where pl_seqnr.id = t1.id
+    )
+    and exists (
+      select * from t4
+      where t4.article_id = pl_inner.article_id
+      and t4.user_id = ?
+    )
+  )
+  and t1.id = ?
+group by t1.id
+having count(pp.id) = 0';
+set @user_id = 'nicke';
+set @id = '2';
+execute stmt using @user_id, @id;
+execute stmt using @user_id, @id;
+deallocate prepare stmt;
+drop table t1, t2, t3, t4;

sql/item.cc

@@ -1701,6 +1701,7 @@ void Item_param::set_null()
   max_length= 0;
   decimals= 0;
   state= NULL_VALUE;
+  item_type= Item::NULL_ITEM;
   DBUG_VOID_RETURN;
 }
 
@@ -2246,33 +2247,6 @@ bool Item_param::convert_str_value(THD *thd)
   return rc;
 }
 
-bool Item_param::fix_fields(THD *thd, Item **ref)
-{
-  DBUG_ASSERT(fixed == 0);
-  SELECT_LEX *cursel= (SELECT_LEX *) thd->lex->current_select;
-
-  /*
-    Parameters in a subselect should mark the subselect as not constant
-    during prepare
-  */
-  if (state == NO_VALUE)
-  {
-    /*
-      SELECT_LEX_UNIT::item set only for subqueries, so test of it presence
-      can be barrier to stop before derived table SELECT or very outer SELECT
-    */
-    for (; cursel->master_unit()->item;
-         cursel= cursel->outer_select())
-    {
-      Item_subselect *subselect_item= cursel->master_unit()->item;
-      subselect_item->used_tables_cache|= OUTER_REF_TABLE_BIT;
-      subselect_item->const_item_cache= 0;
-    }
-  }
-  fixed= 1;
-  return 0;
-}
-
 
 bool Item_param::basic_const_item() const
 {

sql/item.h

@@ -1039,7 +1039,6 @@ public:
   bool get_time(TIME *tm);
   bool get_date(TIME *tm, uint fuzzydate);
   int  save_in_field(Field *field, bool no_conversions);
-  bool fix_fields(THD *, Item **);
 
   void set_null();
   void set_int(longlong i, uint32 max_length_arg);

sql/item_subselect.h

@@ -121,7 +121,6 @@ public:
   friend class Item_in_optimizer;
   friend bool Item_field::fix_fields(THD *, Item **);
   friend bool Item_ref::fix_fields(THD *, Item **);
-  friend bool Item_param::fix_fields(THD *, Item **);
   friend void mark_select_range_as_dependent(THD*,
                                              st_select_lex*, st_select_lex*,
                                              Field*, Item*, Item_ident*);

sql/sql_parse.cc

@@ -5212,6 +5212,11 @@ mysql_new_select(LEX *lex, bool move_down)
   select_lex->init_query();
   select_lex->init_select();
   select_lex->parent_lex= lex;
+  /*
+    Don't evaluate this subquery during statement prepare even if
+    it's a constant one. The flag is switched off in the end of
+    mysql_stmt_prepare.
+  */
   if (thd->current_arena->is_stmt_prepare())
     select_lex->uncacheable|= UNCACHEABLE_PREPARE;
   if (move_down)

sql/sql_prepare.cc

@@ -1825,7 +1825,10 @@ bool mysql_stmt_prepare(THD *thd, char *packet, uint packet_length,
 void init_stmt_after_parse(THD *thd, LEX *lex)
 {
   SELECT_LEX *sl= lex->all_selects_list;
-
+  /*
+    Switch off a temporary flag that prevents evaluation of
+    subqueries in statement prepare.
+  */
   for (; sl; sl= sl->next_select_in_list())
    sl->uncacheable&= ~UNCACHEABLE_PREPARE;
 }