Removing the "thd" argument from Item::create_field_for_create_select().

"thd" is available through the "table" argument, as table->in_use.

sql/item.h

@@ -1056,7 +1056,7 @@ class Item: public Value_source,
   int save_str_value_in_field(Field *field, String *result);
 
   virtual Field *get_tmp_table_field() { return 0; }
-  virtual Field *create_field_for_create_select(THD *thd, TABLE *table);
+  virtual Field *create_field_for_create_select(TABLE *table);
   virtual Field *create_field_for_schema(THD *thd, TABLE *table);
   virtual const char *full_name() const { return name ? name : "???"; }
   const char *field_name_or_null()

sql/item_cmpfunc.h

@@ -951,7 +951,7 @@ class Item_func_ifnull :public Item_func_case_abbreviation2
     maybe_null= args[1]->maybe_null;
   }
   const char *func_name() const { return "ifnull"; }
-  Field *create_field_for_create_select(THD *thd, TABLE *table)
+  Field *create_field_for_create_select(TABLE *table)
   { return tmp_table_field_from_field_type(table, false, false); }
 
   table_map not_null_tables() const { return 0; }

sql/item_func.h

@@ -173,9 +173,8 @@ class Item_func :public Item_func_or_sum
   }
   void signal_divide_by_null();
   friend class udf_handler;
-  Field *create_field_for_create_select(THD *thd, TABLE *table)
+  Field *create_field_for_create_select(TABLE *table)
   {
-    DBUG_ASSERT(thd == table->in_use);
     return result_type() != STRING_RESULT ?
            create_tmp_field(false, table, MY_INT32_NUM_DECIMAL_DIGITS) :
            tmp_table_field_from_field_type(table, false, false);
@@ -1789,7 +1788,7 @@ class Item_func_set_user_var :public Item_func_user_var
   bool update();
   bool fix_fields(THD *thd, Item **ref);
   void fix_length_and_dec();
-  Field *create_field_for_create_select(THD *thd, TABLE *table)
+  Field *create_field_for_create_select(TABLE *table)
   {
     return result_type() != STRING_RESULT ?
            create_tmp_field(false, table, MY_INT32_NUM_DECIMAL_DIGITS) :
@@ -2158,7 +2157,7 @@ class Item_func_sp :public Item_func
 
   enum enum_field_types field_type() const;
 
-  Field *create_field_for_create_select(THD *thd, TABLE *table)
+  Field *create_field_for_create_select(TABLE *table)
   {
     return result_type() != STRING_RESULT ?
            sp_result_field :

sql/item_geofunc.cc

@@ -40,7 +40,7 @@
 #include "opt_range.h"
 
 
-Field *Item_geometry_func::create_field_for_create_select(THD *thd, TABLE *t_arg)
+Field *Item_geometry_func::create_field_for_create_select(TABLE *t_arg)
 {
   Field *result;
   if ((result= new Field_geom(max_length, maybe_null, name, t_arg->s,

sql/item_geofunc.h

@@ -40,7 +40,7 @@ class Item_geometry_func: public Item_str_func
   Item_geometry_func(THD *thd, List<Item> &list): Item_str_func(thd, list) {}
   void fix_length_and_dec();
   enum_field_types field_type() const  { return MYSQL_TYPE_GEOMETRY; }
-  Field *create_field_for_create_select(THD *thd, TABLE *table);
+  Field *create_field_for_create_select(TABLE *table);
 };
 
 class Item_func_geometry_from_text: public Item_geometry_func

sql/item_timefunc.h

@@ -506,7 +506,7 @@ class Item_temporal_func: public Item_func
   bool get_date(MYSQL_TIME *res, ulonglong fuzzy_date) { DBUG_ASSERT(0); return 1; }
   my_decimal *val_decimal(my_decimal *decimal_value)
   { return  val_decimal_from_date(decimal_value); }
-  Field *create_field_for_create_select(THD *thd, TABLE *table)
+  Field *create_field_for_create_select(TABLE *table)
   { return tmp_table_field_from_field_type(table, false, false); }
   int save_in_field(Field *field, bool no_conversions)
   { return save_date_in_field(field); }

sql/sql_insert.cc

@@ -3934,10 +3934,10 @@ void select_insert::abort_result_set() {
   CREATE TABLE (SELECT) ...
 ***************************************************************************/
 
-Field *Item::create_field_for_create_select(THD *thd, TABLE *table)
+Field *Item::create_field_for_create_select(TABLE *table)
 {
   Field *def_field, *tmp_field;
-  return ::create_tmp_field(thd, table, this, type(),
+  return ::create_tmp_field(table->in_use, table, this, type(),
                             (Item ***) 0, &tmp_field, &def_field, 0, 0, 0, 0);
 }
 
@@ -4012,7 +4012,7 @@ static TABLE *create_table_from_items(THD *thd,
 
   while ((item=it++))
   {
-    Field *tmp_field= item->create_field_for_create_select(thd, &tmp_table);
+    Field *tmp_field= item->create_field_for_create_select(&tmp_table);
 
     if (!tmp_field)
       DBUG_RETURN(NULL);