after review changes

sql/item.cc

@@ -301,15 +301,12 @@ bool DTCollation::aggregate(DTCollation &dt)
   return 0;
 }
 
-Item_field::Item_field(Field *f, bool already_fixed)
+Item_field::Item_field(Field *f)
   :Item_ident(NullS, f->table_name, f->field_name)
-#ifndef DBUG_OFF
-  ,double_fix(0)
-#endif
 {
   set_field(f);
   collation.set(DERIVATION_IMPLICIT);
-  fixed= already_fixed;
+  fixed= 1;
 }
 
 // Constructor need to process subselect with temporary tables (see Item)
@@ -317,9 +314,6 @@ Item_field::Item_field(THD *thd, Item_field *item)
   :Item_ident(thd, item),
    field(item->field),
    result_field(item->result_field)
-#ifndef DBUG_OFF
-  ,double_fix(0)
-#endif
 {
   collation.set(DERIVATION_IMPLICIT);
 }
@@ -487,6 +481,7 @@ Item *Item_field::get_tmp_table_item(THD *thd)
 
 String *Item_int::val_str(String *str)
 {
+  // following assert is redundant, because fixed=1 assigned in constructor
   DBUG_ASSERT(fixed == 1);
   str->set(value, &my_charset_bin);
   return str;
@@ -502,6 +497,7 @@ void Item_int::print(String *str)
 
 String *Item_uint::val_str(String *str)
 {
+  // following assert is redundant, because fixed=1 assigned in constructor
   DBUG_ASSERT(fixed == 1);
   str->set((ulonglong) value, &my_charset_bin);
   return str;
@@ -518,6 +514,7 @@ void Item_uint::print(String *str)
 
 String *Item_real::val_str(String *str)
 {
+  // following assert is redundant, because fixed=1 assigned in constructor
   DBUG_ASSERT(fixed == 1);
   str->set(value,decimals,&my_charset_bin);
   return str;
@@ -537,20 +534,23 @@ bool Item_null::eq(const Item *item, bool binary_cmp) const
 { return item->type() == type(); }
 double Item_null::val()
 {
-  // NULL can be used without fix_fields
+  // following assert is redundant, because fixed=1 assigned in constructor
+  DBUG_ASSERT(fixed == 1);
   null_value=1;
   return 0.0;
 }
 longlong Item_null::val_int()
 {
-  // NULL can be used without fix_fields
+  // following assert is redundant, because fixed=1 assigned in constructor
+  DBUG_ASSERT(fixed == 1);
   null_value=1;
   return 0;
 }
 /* ARGSUSED */
 String *Item_null::val_str(String *str)
 {
-  // NULL can be used without fix_fields
+  // following assert is redundant, because fixed=1 assigned in constructor
+  DBUG_ASSERT(fixed == 1);
   null_value=1;
   return 0;
 }
@@ -832,8 +832,7 @@ bool Item::fix_fields(THD *thd,
 {
 
   // We do not check fields which are fixed during construction
-  DBUG_ASSERT(fixed == 0 || type() == INT_ITEM || type() == CACHE_ITEM ||
-	      type() == STRING_ITEM || type() == MYSQL_TYPE_DATETIME);
+  DBUG_ASSERT(fixed == 0 || basic_const_item());
   fixed= 1;
   return 0;
 }
@@ -904,7 +903,7 @@ static void mark_as_dependent(THD *thd, SELECT_LEX *last, SELECT_LEX *current,
 
 bool Item_field::fix_fields(THD *thd, TABLE_LIST *tables, Item **ref)
 {
-  DBUG_ASSERT(fixed == 0 || double_fix == 0);
+  DBUG_ASSERT(fixed == 0);
   if (!field)					// If field is not checked
   {
     TABLE_LIST *where= 0;
@@ -1341,6 +1340,10 @@ int Item_int::save_in_field(Field *field, bool no_conversions)
   return field->store(nr);
 }
 
+Item_num *Item_uint::neg()
+{
+  return new Item_real(name, - ((double) value), 0, max_length);
+}
 
 int Item_real::save_in_field(Field *field, bool no_conversions)
 {
@@ -1383,10 +1386,12 @@ Item_varbinary::Item_varbinary(const char *str, uint str_length)
   }
   *ptr=0;					// Keep purify happy
   collation.set(&my_charset_bin, DERIVATION_COERCIBLE);
+  fixed= 1;
 }
 
 longlong Item_varbinary::val_int()
 {
+  // following assert is redundant, because fixed=1 assigned in constructor
   DBUG_ASSERT(fixed == 1);
   char *end=(char*) str_value.ptr()+str_value.length(),
        *ptr=end-min(str_value.length(),sizeof(longlong));
@@ -1648,7 +1653,7 @@ bool Item_ref::fix_fields(THD *thd,TABLE_LIST *tables, Item **reference)
       {
 	ref= 0; // To prevent "delete *ref;" on ~Item_erf() of this item
 	Item_field* fld;
-	if (!((*reference)= fld= new Item_field(tmp, 1)))
+	if (!((*reference)= fld= new Item_field(tmp)))
 	  return 1;
 	register_item_tree_changing(reference);
 	mark_as_dependent(thd, last, thd->lex->current_select, fld);

sql/item.h

@@ -137,6 +137,11 @@ public:
   }
   virtual void make_field(Send_field *field);
   virtual bool fix_fields(THD *, struct st_table_list *, Item **);
+  /*
+    should be used in case where we are shure that we do not need
+    complete fix_fields() procedure.
+  */
+  inline void quick_fix_field() { fixed= 1; }
   virtual int save_in_field(Field *field, bool no_conversions);
   virtual void save_org_in_field(Field *field)
   { (void) save_in_field(field, 1); }
@@ -245,7 +250,7 @@ public:
 class Item_num: public Item
 {
 public:
-  virtual void neg()= 0;
+  virtual Item_num* neg()= 0;
 };
 
 
@@ -288,7 +293,7 @@ public:
   { collation.set(DERIVATION_IMPLICIT); }
   // Constructor need to process subselect with temporary tables (see Item)
   Item_field(THD *thd, Item_field *item);
-  Item_field(Field *field, bool already_fixed);
+  Item_field(Field *field);
   enum Type type() const { return FIELD_ITEM; }
   bool eq(const Item *item, bool binary_cmp) const;
   double val();
@@ -321,13 +326,19 @@ public:
   void cleanup();
   friend class Item_default_value;
   friend class Item_insert_value;
+  friend class st_select_lex_unit;
 };
 
 class Item_null :public Item
 {
 public:
   Item_null(char *name_par=0)
-    { maybe_null=null_value=TRUE; name= name_par ? name_par : (char*) "NULL";}
+  {
+    maybe_null= null_value= TRUE;
+    max_length= 0;
+    name= name_par ? name_par : (char*) "NULL";
+    fixed= 1;
+  }
   enum Type type() const { return NULL_ITEM; }
   bool eq(const Item *item, bool binary_cmp) const;
   double val();
@@ -338,13 +349,8 @@ public:
   bool send(Protocol *protocol, String *str);
   enum Item_result result_type () const { return STRING_RESULT; }
   enum_field_types field_type() const   { return MYSQL_TYPE_NULL; }
-  bool fix_fields(THD *thd, struct st_table_list *list, Item **item)
-  {
-    DBUG_ASSERT(fixed == 0);
-    bool res= Item::fix_fields(thd, list, item);
-    max_length=0;
-    return res;
-  }
+  // to prevent drop fixed flag (no need parent cleanup call)
+  void cleanup() {}
   bool basic_const_item() const { return 1; }
   Item *new_item() { return new Item_null(name); }
   bool is_null() { return 1; }
@@ -431,9 +437,9 @@ public:
   bool basic_const_item() const { return 1; }
   Item *new_item() { return new Item_int(name,value,max_length); }
   // to prevent drop fixed flag (no need parent cleanup call)
-  void cleanup() { fixed= 1; }
+  void cleanup() {}
   void print(String *str);
-  void neg() { value= -value; }
+  Item_num *neg() { value= -value; return this; }
 };
 
 
@@ -451,6 +457,7 @@ public:
   Item *new_item() { return new Item_uint(name,max_length); }
   int save_in_field(Field *field, bool no_conversions);
   void print(String *str);
+  Item_num *neg ();
 };
 
 
@@ -459,11 +466,12 @@ class Item_real :public Item_num
 public:
   double value;
   // Item_real() :value(0) {}
-  Item_real(const char *str_arg,uint length) :value(my_atof(str_arg))
+  Item_real(const char *str_arg, uint length) :value(my_atof(str_arg))
   {
     name=(char*) str_arg;
     decimals=(uint8) nr_of_decimals(str_arg);
     max_length=length;
+    fixed= 1;
   }
   Item_real(const char *str,double val_arg,uint decimal_par,uint length)
     :value(val_arg)
@@ -471,8 +479,9 @@ public:
     name=(char*) str;
     decimals=(uint8) decimal_par;
     max_length=length;
+    fixed= 1;
   }
-  Item_real(double value_par) :value(value_par) {}
+  Item_real(double value_par) :value(value_par) { fixed= 1; }
   int save_in_field(Field *field, bool no_conversions);
   enum Type type() const { return REAL_ITEM; }
   enum_field_types field_type() const { return MYSQL_TYPE_DOUBLE; }
@@ -484,8 +493,10 @@ public:
   }
   String *val_str(String*);
   bool basic_const_item() const { return 1; }
+  // to prevent drop fixed flag (no need parent cleanup call)
+  void cleanup() {}
   Item *new_item() { return new Item_real(name,value,decimals,max_length); }
-  void neg() { value= -value; }
+  Item_num *neg() { value= -value; return this; }
 };
 
 
@@ -564,11 +575,8 @@ public:
   String *const_string() { return &str_value; }
   inline void append(char *str, uint length) { str_value.append(str, length); }
   void print(String *str);
-  void cleanup()
-  {
-    // it is constant => can be used without fix_fields (and frequently used)
-    fixed= 1;
-  }
+  // to prevent drop fixed flag (no need parent cleanup call)
+  void cleanup() {}
 };
 
 /* for show tables */
@@ -613,10 +621,13 @@ public:
   double val()
     { DBUG_ASSERT(fixed == 1); return (double) Item_varbinary::val_int(); }
   longlong val_int();
+  bool basic_const_item() const { return 1; }
   String *val_str(String*) { DBUG_ASSERT(fixed == 1); return &str_value; }
   int save_in_field(Field *field, bool no_conversions);
   enum Item_result result_type () const { return STRING_RESULT; }
   enum_field_types field_type() const { return MYSQL_TYPE_STRING; }
+  // to prevent drop fixed flag (no need parent cleanup call)
+  void cleanup() {}
 };
 
 
@@ -874,7 +885,6 @@ public:
   bool eq(const Item *item, bool binary_cmp) const;
   bool fix_fields(THD *, struct st_table_list *, Item **);
   void print(String *str);
-  virtual bool basic_const_item() const { return true; }
   int save_in_field(Field *field_arg, bool no_conversions)
   {
     if (!arg)
@@ -902,7 +912,6 @@ public:
   bool eq(const Item *item, bool binary_cmp) const;
   bool fix_fields(THD *, struct st_table_list *, Item **);
   void print(String *str);
-  virtual bool basic_const_item() const { return true; }
   int save_in_field(Field *field_arg, bool no_conversions)
   {
     return Item_field::save_in_field(field_arg, no_conversions);
@@ -926,7 +935,7 @@ public:
 
   void set_used_tables(table_map map) { used_table_map= map; }
 
-  virtual bool allocate(uint i) { return 0; };
+  virtual bool allocate(uint i) { return 0; }
   virtual bool setup(Item *item)
   {
     example= item;
@@ -941,7 +950,7 @@ public:
   table_map used_tables() const { return used_table_map; }
   virtual void keep_array() {}
   // to prevent drop fixed flag (no need parent cleanup call)
-  void cleanup() { fixed= 1; }
+  void cleanup() {}
   void print(String *str);
 };
 

sql/item_cmpfunc.h

@@ -991,13 +991,13 @@ public:
 
 /* Some usefull inline functions */
 
-inline Item *and_conds(Item *a,Item *b)
+inline Item *and_conds(Item *a, Item *b, TABLE_LIST *tables)
 {
   if (!b) return a;
   if (!a) return b;
   Item *cond= new Item_cond_and(a,b);
   if (cond)
-    cond->fix_fields(current_thd, 0, &cond);
+    cond->fix_fields(current_thd, tables, &cond);
   return cond;
 }
 

sql/item_func.cc

@@ -428,7 +428,7 @@ void Item_func::fix_num_length_and_dec()
 Item *Item_func::get_tmp_table_item(THD *thd)
 {
   if (!with_sum_func && !const_item())
-    return new Item_field(result_field, 1);
+    return new Item_field(result_field);
   return copy_or_same(thd);
 }
 
@@ -2780,7 +2780,13 @@ void Item_func_match::init_search(bool no_order)
       fields.push_back(args[i]);
     concat=new Item_func_concat_ws(new Item_string(" ",1,
                                    cmp_collation.collation), fields);
-    concat->fix_fields(current_thd, 0, &concat);
+    /*
+      Above function used only to get value and do not need fix_fields for it:
+      Item_string - basic constant
+      fields - fix_fieds already was called for this arguments
+      Item_func_concat_ws - do not need fix_fields to produce value
+    */
+    concat->quick_fix_field();
   }
 
   if (master)

sql/item_strfunc.cc

@@ -74,9 +74,10 @@ longlong Item_str_func::val_int()
   int err;
   String *res;
   res=val_str(&str_value);
-  return res ?
-    my_strntoll(res->charset(), res->ptr(), res->length(), 10, NULL, &err) :
-    (longlong) 0;
+  return (res ?
+	  my_strntoll(res->charset(), res->ptr(), res->length(), 10, NULL,
+		      &err) :
+	  (longlong) 0);
 }
 
 

sql/item_subselect.cc

@@ -116,6 +116,8 @@ bool Item_subselect::fix_fields(THD *thd_param, TABLE_LIST *tables, Item **ref)
   {
     if (substitution)
     {
+      int ret= 0;
+
       // did we changed top item of WHERE condition
       if (unit->outer_select()->where == (*ref))
 	unit->outer_select()->where= substitution; // correct WHERE for PS
@@ -127,7 +129,6 @@ bool Item_subselect::fix_fields(THD *thd_param, TABLE_LIST *tables, Item **ref)
       substitution= 0;
       fixed= 1;
       thd->where= "checking transformed subquery";      
-      int ret= 0;
       if (!(*ref)->fixed)
 	ret= (*ref)->fix_fields(thd, tables, ref);
       // We can't substitute aggregate functions (like (SELECT (max(i)))
@@ -204,7 +205,7 @@ bool Item_subselect::const_item() const
 Item *Item_subselect::get_tmp_table_item(THD *thd)
 {
   if (!with_sum_func && !const_item())
-    return new Item_field(result_field, 1);
+    return new Item_field(result_field);
   return copy_or_same(thd);
 }
 

sql/item_sum.cc

@@ -113,7 +113,7 @@ Item *Item_sum::get_tmp_table_item(THD *thd)
 	if (arg->type() == Item::FIELD_ITEM)
 	  ((Item_field*) arg)->field= result_field_tmp++;
 	else
-	  sum_item->args[i]= new Item_field(result_field_tmp++, 1);
+	  sum_item->args[i]= new Item_field(result_field_tmp++);
       }
     }
   }

sql/item_sum.h

@@ -88,7 +88,7 @@ public:
   virtual void fix_length_and_dec() { maybe_null=1; null_value=1; }
   virtual const char *func_name() const { return "?"; }
   virtual Item *result_item(Field *field)
-    { return new Item_field(field, 1);}
+    { return new Item_field(field);}
   table_map used_tables() const { return ~(table_map) 0; } /* Not used */
   bool const_item() const { return 0; }
   bool is_null() { return null_value; }

sql/sql_base.cc

@@ -2293,7 +2293,7 @@ insert_fields(THD *thd,TABLE_LIST *tables, const char *db_name,
       thd->used_tables|=table->map;
       while ((field = *ptr++))
       {
-	Item_field *item= new Item_field(field, 0);
+	Item_field *item= new Item_field(field);
 	if (!found++)
 	  (void) it->replace(item);		// Replace '*'
 	else
@@ -2365,7 +2365,7 @@ int setup_conds(THD *thd,TABLE_LIST *tables,COND **conds)
 	   !(specialflag & SPECIAL_NO_NEW_FUNC)))
       {
 	table->outer_join= 0;
-	if (!(*conds=and_conds(*conds, table->on_expr)))
+	if (!(*conds= and_conds(*conds, table->on_expr, tables)))
 	  DBUG_RETURN(1);
 	table->on_expr=0;
       }
@@ -2373,9 +2373,9 @@ int setup_conds(THD *thd,TABLE_LIST *tables,COND **conds)
     if (table->natural_join)
     {
       /* Make a join of all fields with have the same name */
-      TABLE *t1=table->table;
-      TABLE *t2=table->natural_join->table;
-      Item_cond_and *cond_and=new Item_cond_and();
+      TABLE *t1= table->table;
+      TABLE *t2= table->natural_join->table;
+      Item_cond_and *cond_and= new Item_cond_and();
       if (!cond_and)				// If not out of memory
 	DBUG_RETURN(1);
       cond_and->top_level_item();
@@ -2390,10 +2390,8 @@ int setup_conds(THD *thd,TABLE_LIST *tables,COND **conds)
 			     t1->field[i]->field_name,
 			     t2->field[j]->field_name))
 	  {
-	    // fix_fields() call will be made for tmp by cond_and->fix_fields
-	    Item_func_eq *tmp=new Item_func_eq(new Item_field(t1->field[i], 1),
-					       new Item_field(t2->field[j],
-							      1));
+	    Item_func_eq *tmp= new Item_func_eq(new Item_field(t1->field[i]),
+						new Item_field(t2->field[j]));
 	    if (!tmp)
 	      DBUG_RETURN(1);
 	    /* Mark field used for table cache */
@@ -2405,18 +2403,22 @@ int setup_conds(THD *thd,TABLE_LIST *tables,COND **conds)
 	  }
 	}
       }
-      //cond_and->used_tables_cache= t1->map | t2->map;
       thd->lex->current_select->cond_count+= cond_and->list.elements;
-      if (cond_and->fix_fields(thd, tables, (Item**)&cond_and) ||
-	  cond_and->check_cols(1))
-	DBUG_RETURN(1);
+
       if (!table->outer_join)			// Not left join
       {
-	if (!(*conds=and_conds(*conds, cond_and)))
+	if (!(*conds= and_conds(*conds, cond_and, tables)) ||
+	    (*conds && !(*conds)->fixed &&
+	     (*conds)->fix_fields(thd, tables, conds)))
 	  DBUG_RETURN(1);
       }
       else
-	table->on_expr=and_conds(table->on_expr,cond_and);
+      {
+	table->on_expr= and_conds(table->on_expr, cond_and, tables);
+	if (table->on_expr && !table->on_expr->fixed &&
+	    table->on_expr->fix_fields(thd, tables, &table->on_expr))
+	  DBUG_RETURN(1);
+      }
     }
   }
   DBUG_RETURN(test(thd->net.report_error));

sql/sql_help.cc

@@ -624,7 +624,7 @@ SQL_SELECT *prepare_select_for_name(THD *thd, const char *mask, uint mlen,
 				    TABLE_LIST *tables, TABLE *table,
 				    Field *pfname, int *error)
 {
-  Item *cond= new Item_func_like(new Item_field(pfname, 1),
+  Item *cond= new Item_func_like(new Item_field(pfname),
 				 new Item_string(mask,mlen,pfname->charset()),
 				 (char*) "\\");
   if (thd->is_fatal_error)
@@ -744,10 +744,10 @@ int mysqld_help(THD *thd, const char *mask)
     {
       Field *topic_cat_id= used_fields[help_topic_help_category_id].field;
       Item *cond_topic_by_cat=
-	new Item_func_equal(new Item_field(topic_cat_id, 1),
+	new Item_func_equal(new Item_field(topic_cat_id),
 			    new Item_int((int32)category_id));
       Item *cond_cat_by_cat=
-	new Item_func_equal(new Item_field(cat_cat_id, 1),
+	new Item_func_equal(new Item_field(cat_cat_id),
 			    new Item_int((int32)category_id));
       if (!(select_topics_by_cat= prepare_simple_select(thd,cond_topic_by_cat,
 							tables,tables[0].table,

sql/sql_load.cc

@@ -122,7 +122,7 @@ int mysql_load(THD *thd,sql_exchange *ex,TABLE_LIST *table_list,
   {
     Field **field;
     for (field=table->field; *field ; field++)
-      fields.push_back(new Item_field(*field, 1));
+      fields.push_back(new Item_field(*field));
   }
   else
   {						// Part field list

sql/sql_parse.cc

@@ -4031,11 +4031,10 @@ bool add_field_to_list(THD *thd, char *field_name, enum_field_types type,
 
   if (default_value)
   {
-    if (default_value->fix_fields(thd, 0, &default_value))
-    {
-      DBUG_RETURN(1);
-    }
     /*
+      Default value should be literal => basic constants =>
+      no need fix_fields()
+
       We allow specifying value for first TIMESTAMP column 
       altough it is silently ignored. This should be fixed in 4.1
       (by proper warning or real support for default values)

sql/sql_select.cc

@@ -321,9 +321,9 @@ JOIN::prepare(Item ***rref_pointer_array,
     thd->where="having clause";
     thd->allow_sum_func=1;
     select_lex->having_fix_field= 1;
-    bool having_fix_rc= !having->fixed &&
-      (having->fix_fields(thd, tables_list, &having) ||
-       having->check_cols(1));
+    bool having_fix_rc= (!having->fixed &&
+			 (having->fix_fields(thd, tables_list, &having) ||
+			  having->check_cols(1)));
     select_lex->having_fix_field= 0;
     if (having_fix_rc || thd->net.report_error)
       DBUG_RETURN(-1);				/* purecov: inspected */
@@ -525,7 +525,7 @@ JOIN::optimize()
   }
 #endif
 
-  conds= optimize_cond(thd, conds,&cond_value);
+  conds= optimize_cond(thd, conds, &cond_value);
   if (thd->net.report_error)
   {
     error= 1;
@@ -1431,10 +1431,13 @@ JOIN::exec()
 	{
 	  if (!(curr_table->select->cond=
 		new Item_cond_and(curr_table->select->cond,
-				  sort_table_cond)) ||
-	      curr_table->select->cond->fix_fields(thd, tables_list,
-						   &curr_table->select->cond))
+				  sort_table_cond)))
 	    DBUG_VOID_RETURN;
+	  /*
+	    Item_cond_and do not need fix_fields for execution, its parameters
+	    are fixed or do not need fix_fields, too
+	  */
+	  curr_table->select->cond->quick_fix_field();
 	}
 	curr_table->select_cond= curr_table->select->cond;
 	curr_table->select_cond->top_level_item();
@@ -3533,7 +3536,7 @@ make_join_select(JOIN *join,SQL_SELECT *select,COND *cond)
 	  {
 	    /* Join with outer join condition */
 	    COND *orig_cond=sel->cond;
-	    sel->cond=and_conds(sel->cond,tab->on_expr);
+	    sel->cond=and_conds(sel->cond, tab->on_expr, 0);
 	    if (sel->test_quick_select(join->thd, tab->keys,
 				       used_tables & ~ current_map,
 				       (join->select_options &
@@ -5016,7 +5019,7 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
 	    *blob_field++= new_field;
 	    blob_count++;
 	  }
-	  ((Item_sum*) item)->args[i]= new Item_field(new_field, 1);
+	  ((Item_sum*) item)->args[i]= new Item_field(new_field);
 	}
       }
     }
@@ -6798,8 +6801,14 @@ make_cond_for_table(COND *cond, table_map tables, table_map used_table)
       case 1:
 	return new_cond->argument_list()->head();
       default:
-	if (new_cond->fix_fields(current_thd, 0, (Item**)&new_cond))
-	  return (COND*) 0;
+	/*
+	  Item_cond_and do not need fix_fields for execution, its parameters
+	  are fixed or do not need fix_fields, too
+	*/
+	new_cond->quick_fix_field();
+	new_cond->used_tables_cache=
+	  ((Item_cond_and*) cond)->used_tables_cache &
+	  tables;
 	return new_cond;
       }
     }
@@ -6817,8 +6826,12 @@ make_cond_for_table(COND *cond, table_map tables, table_map used_table)
 	  return (COND*) 0;			// Always true
 	new_cond->argument_list()->push_back(fix);
       }
-      if (new_cond->fix_fields(current_thd, 0, (Item**)&new_cond))
-	return (COND*) 0;
+      /*
+	Item_cond_and do not need fix_fields for execution, its parameters
+	are fixed or do not need fix_fields, too
+      */
+      new_cond->quick_fix_field();
+      new_cond->used_tables_cache= ((Item_cond_or*) cond)->used_tables_cache;
       new_cond->top_level_item();
       return new_cond;
     }
@@ -7324,7 +7337,7 @@ static bool fix_having(JOIN *join, Item **having)
     else					// This should never happen
       if (!(table->select->cond= new Item_cond_and(table->select->cond,
 						   sort_table_cond)) ||
-	  table->select->cond->fix_fields(join->thd, join->tanles_list,
+	  table->select->cond->fix_fields(join->thd, join->tables_list,
 					  &table->select->cond))
 	return 1;
     table->select_cond=table->select->cond;
@@ -7945,12 +7958,13 @@ find_order_in_list(THD *thd, Item **ref_pointer_array,
   order->in_field_list=0;
   Item *it= *order->item;
   /*
-    we check it->fixed because Item_func_group_concat can put
-    arguments for which fix_fields already was called
+    We check it->fixed because Item_func_group_concat can put
+    arguments for which fix_fields already was called.
+
+    'it' reassigned in if condition because fix_field can change it.
   */
   if (!it->fixed &&
       (it->fix_fields(thd, tables, order->item) ||
-       //'it' ressigned because fix_field can change it
        (it= *order->item)->check_cols(1) ||
        thd->is_fatal_error))
     return 1;					// Wrong field 
@@ -8603,7 +8617,7 @@ change_to_use_tmp_fields(THD *thd, Item **ref_pointer_array,
 	if (item->type() == Item::SUM_FUNC_ITEM && field->table->group)
 	  item_field= ((Item_sum*) item)->result_item(field);
 	else
-	  item_field= (Item*) new Item_field(field, 1);
+	  item_field= (Item*) new Item_field(field);
 	if (!item_field)
 	  return TRUE;				// Fatal error
 	item_field->name= item->name;		/*lint -e613 */
@@ -8778,7 +8792,7 @@ static bool add_ref_to_table_cond(THD *thd, JOIN_TAB *join_tab)
     Field *field=table->field[table->key_info[join_tab->ref.key].key_part[i].
 			      fieldnr-1];
     Item *value=join_tab->ref.items[i];
-    cond->add(new Item_func_equal(new Item_field(field, 1), value));
+    cond->add(new Item_func_equal(new Item_field(field), value));
   }
   if (thd->is_fatal_error)
     DBUG_RETURN(TRUE);

sql/sql_show.cc

@@ -1050,7 +1050,7 @@ mysqld_list_fields(THD *thd, TABLE_LIST *table_list, const char *wild)
   {
     if (!wild || !wild[0] || 
         !wild_case_compare(system_charset_info, field->field_name,wild))
-      field_list.push_back(new Item_field(field, 1));
+      field_list.push_back(new Item_field(field));
   }
   restore_record(table,default_values);              // Get empty record
   if (thd->protocol->send_fields(&field_list,2))

sql/sql_union.cc

@@ -229,12 +229,9 @@ int st_select_lex_unit::prepare(THD *thd_arg, select_result *sel_result,
       Field **field;
       for (field= table->field; *field; field++)
       {
-	Item_field *item= new Item_field(*field, 1);
-	if (item_list.push_back(item))
+	Item_field *item= new Item_field(*field);
+	if (!item || item_list.push_back(item))
 	  DBUG_RETURN(-1);
-#ifndef DBUG_OFF
-	item->double_fix= 0;
-#endif
       }
     }
   }
@@ -463,4 +460,17 @@ int st_select_lex_unit::cleanup()
 void st_select_lex_unit::reinit_exec_mechanism()
 {
   prepared= optimized= executed= 0;
+#ifndef DBUG_OFF
+  List_iterator_fast<Item> it(item_list);
+  Item_field *field;
+  while ((field= (Item_field *)it++))
+  {
+    /*
+      we can't cleanup here, because it broke link to temporary table field,
+      but have to drop fixed flag to allow next fix_field of this field
+      during re-executing
+    */
+    field->fixed= 0;
+  }
+#endif
 }

sql/sql_update.cc

@@ -689,7 +689,7 @@ multi_update::initialize_tables(JOIN *join)
   {
     TABLE *table=table_ref->table;
     uint cnt= table_ref->shared;
-    Item_field *If;
+    Item_field *ifield;
     List<Item> temp_fields= *fields_for_table[cnt];
     ORDER     group;
 
@@ -713,10 +713,10 @@ multi_update::initialize_tables(JOIN *join)
     /* ok to be on stack as this is not referenced outside of this func */
     Field_string offset(table->file->ref_length, 0, "offset",
 			table, &my_charset_bin);
-    if (!(If= new Item_field(((Field *) &offset), 1)))
+    if (!(ifield= new Item_field(((Field *) &offset))))
       DBUG_RETURN(1);
-    If->maybe_null=0;
-    if (temp_fields.push_front(If))
+    ifield->maybe_null= 0;
+    if (temp_fields.push_front(ifield))
       DBUG_RETURN(1);
 
     /* Make an unique key over the first field to avoid duplicated updates */

sql/sql_yacc.yy

@@ -4353,10 +4353,10 @@ purge_option:
 	  }
 	  Item *tmp= new Item_func_unix_timestamp($2);
 	  /*
-	    it is OK olny emulate fix_fieds, because we need only
+	    it is OK only emulate fix_fieds, because we need only
             value of constant
 	  */
-	  tmp->Item::fix_fields(0,0,0);
+	  tmp->quick_fix_field();
 	  Lex->sql_command = SQLCOM_PURGE_BEFORE;
 	  Lex->purge_time= (ulong) tmp->val_int();
 	}
@@ -4492,11 +4492,11 @@ text_string:
 	  {
 	    Item *tmp = new Item_varbinary($1.str,$1.length);
 	    /*
-	      it is OK olny emulate fix_fieds, because we need only
+	      it is OK only emulate fix_fieds, because we need only
               value of constant
 	    */
 	    $$= tmp ?
-	      tmp->Item::fix_fields(0,0,0), tmp->val_str((String*) 0) :
+	      tmp->quick_fix_field(), tmp->val_str((String*) 0) :
 	      (String*) 0;
 	  }
 	;
@@ -4529,9 +4529,8 @@ signed_literal:
 	| '+' NUM_literal { $$ = $2; }
 	| '-' NUM_literal
 	  {
-	    $2->neg();
 	    $2->max_length++;
-	    $$= $2;
+	    $$= $2->neg();
 	  }
 	;
 
@@ -4546,11 +4545,11 @@ literal:
 	  {
 	    Item *tmp= new Item_varbinary($2.str,$2.length);
 	    /*
-	      it is OK olny emulate fix_fieds, because we need only
+	      it is OK only emulate fix_fieds, because we need only
               value of constant
 	    */
 	    String *str= tmp ?
-	      tmp->Item::fix_fields(0,0,0), tmp->val_str((String*) 0) :
+	      tmp->quick_fix_field(), tmp->val_str((String*) 0) :
 	      (String*) 0;
 	    $$= new Item_string(str ? str->ptr() : "",
 				str ? str->length() : 0,