removed switching off static table optimization for subselects (SCRUM ,...

removed switching off static table optimization for subselects (SCRUM , pre-commit  to be able merge with temporary table fix)

sql/item.cc

@@ -261,7 +261,7 @@ table_map Item_field::used_tables() const
 {
   if (field->table->const_table)
     return 0;					// const item
-  return field->table->map;
+  return (depended_from? RAND_TABLE_BIT : field->table->map);
 }
 
 

sql/item.h

@@ -666,7 +666,12 @@ class Item_field_buff :public Item_buff
 
 class Item_cache: public Item
 {
+  table_map used_table_map;
 public:
+  Item_cache(): used_table_map(0) {fixed= 1; null_value= 1;}
+
+  void set_used_tables(table_map map) { used_table_map= map; }
+
   virtual bool allocate(uint i) { return 0; };
   virtual bool setup(Item *) { return 0; };
   virtual void store(Item *)= 0;
@@ -677,13 +682,14 @@ class Item_cache: public Item
   }
   enum Type type() const { return CACHE_ITEM; }
   static Item_cache* get_cache(Item_result type);
+  table_map used_tables() const { return used_table_map; }
 };
 
 class Item_cache_int: public Item_cache
 {
   longlong value;
 public:
-  Item_cache_int() { fixed= 1; null_value= 1; }
+  Item_cache_int(): Item_cache() {}
   
   void store(Item *item)
   {
@@ -700,7 +706,7 @@ class Item_cache_real: public Item_cache
 {
   double value;
 public:
-  Item_cache_real() { fixed= 1; null_value= 1; }
+  Item_cache_real(): Item_cache() {}
   
   void store(Item *item)
   {
@@ -722,7 +728,7 @@ class Item_cache_str: public Item_cache
   char buffer[80];
   String *value;
 public:
-  Item_cache_str() { fixed= 1; null_value= 1; }
+  Item_cache_str(): Item_cache() { }
   
   void store(Item *item);
   double val();
@@ -737,7 +743,7 @@ class Item_cache_row: public Item_cache
   Item_cache  **values;
   uint item_count;
 public:
-  Item_cache_row(): values(0), item_count(2) { fixed= 1; null_value= 1; }
+  Item_cache_row(): Item_cache(), values(0), item_count(2) {}
   
   /*
     'allocate' used only in row transformer, to preallocate space for row 

sql/item_cmpfunc.cc

@@ -290,6 +290,14 @@ bool Item_in_optimizer::fix_fields(THD *thd, struct st_table_list *tables,
   if (!cache && !(cache= Item_cache::get_cache(args[0]->result_type())))
     return 1;
   cache->setup(args[0]);
+  if (cache->cols() == 1)
+    cache->set_used_tables(RAND_TABLE_BIT);
+  else
+  {
+    uint n= cache->cols();
+    for (uint i= 0; i < n; i++)
+      ((Item_cache *)cache->el(i))->set_used_tables(RAND_TABLE_BIT);
+  }
   if (args[1]->fix_fields(thd, tables, args))
     return 1;
   Item_in_subselect * sub= (Item_in_subselect *)args[1];

sql/sql_select.cc

@@ -442,16 +442,6 @@ JOIN::optimize()
       thd->fatal_error)
     DBUG_RETURN(1);
 
-  if (select_lex->dependent)
-  {
-    /*
-      Just remove all const-table optimization in case of depended query
-      TODO: optimize
-    */
-    const_table_map= 0;
-    const_tables= 0;
-    found_const_table_map= 0;
-  }
   thd->proc_info= "preparing";
   if (result->initialize_tables(this))
   {
@@ -4681,8 +4671,11 @@ do_select(JOIN *join,List<Item> *fields,TABLE *table,Procedure *procedure)
   join->send_records=0;
   if (join->tables == join->const_tables)
   {
-    if (!(error=(*end_select)(join,join_tab,0)) || error == -3)
-      error=(*end_select)(join,join_tab,1);
+    if (!join->select_lex->dependent ||
+	((!join->conds || join->conds->val_int()) &&
+	 (!join->having || join->having->val_int())))
+      if (!(error=(*end_select)(join,join_tab,0)) || error == -3)
+	error=(*end_select)(join,join_tab,1);
   }
   else
   {