row IN subselects (SCRUM)

mysql-test/r/subselect.result:
  test of row IN subslect
mysql-test/t/subselect.test:
  test of row IN subslect
sql/item.cc:
  New helper Item - reference on item list by number
  cache item for row
sql/item.h:
  layout fixed 
  New helper Item - reference on item list by number
  cache item for row
sql/item_cmpfunc.cc:
  changed Item_in_optimizer to be able work with row
sql/item_cmpfunc.h:
  changed Item_in_optimizer to be able work with row
sql/item_row.cc:
  Fixed row Item to be compatible with row subselect
sql/item_row.h:
  Fixed row Item to be compatible with row subselect
sql/item_subselect.cc:
  changed name of class to corerectly reflex its function
  row IN subselect
sql/item_subselect.h:
  changed name of class to corerectly reflex its function
  row IN subselect
sql/sql_class.cc:
  changed name of class to corerectly reflex its function
sql/sql_class.h:
  changed name of class to corerectly reflex its function
sql/sql_yacc.yy:
  changed name of class to corerectly reflex its function

mysql-test/r/subselect.result

@@ -773,3 +773,34 @@ a	(select a,b,c from t1 where t1.a=t2.a) = ROW(a,4,'c')	(select c from t1 where
 2	0	b
 NULL	NULL	NULL
 drop table t1,t2;
+drop table if exists t;
+create table t (a int, b real, c varchar(10));
+insert into t values (1, 1, 'a'), (2,2,'b'), (NULL, 2, 'b');
+select ROW(1, 1, 'a') IN (select a,b,c from t);
+ROW(1, 1, 'a') IN (select a,b,c from t)
+1
+select ROW(1, 2, 'a') IN (select a,b,c from t);
+ROW(1, 2, 'a') IN (select a,b,c from t)
+NULL
+select ROW(1, 1, 'a') IN (select b,a,c from t);
+ROW(1, 1, 'a') IN (select b,a,c from t)
+1
+select ROW(1, 1, 'a') IN (select a,b,c from t where a is not null);
+ROW(1, 1, 'a') IN (select a,b,c from t where a is not null)
+1
+select ROW(1, 2, 'a') IN (select a,b,c from t where a is not null);
+ROW(1, 2, 'a') IN (select a,b,c from t where a is not null)
+0
+select ROW(1, 1, 'a') IN (select b,a,c from t where a is not null);
+ROW(1, 1, 'a') IN (select b,a,c from t where a is not null)
+1
+select ROW(1, 1, 'a') IN (select a,b,c from t where c='b' or c='a');
+ROW(1, 1, 'a') IN (select a,b,c from t where c='b' or c='a')
+1
+select ROW(1, 2, 'a') IN (select a,b,c from t where c='b' or c='a');
+ROW(1, 2, 'a') IN (select a,b,c from t where c='b' or c='a')
+NULL
+select ROW(1, 1, 'a') IN (select b,a,c from t where c='b' or c='a');
+ROW(1, 1, 'a') IN (select b,a,c from t where c='b' or c='a')
+1
+drop table if exists t;

mysql-test/t/subselect.test

@@ -434,3 +434,17 @@ select a, (select a,b,c from t1 where t1.a=t2.a) = ROW(a,2,'a'),(select c from t
 select a, (select a,b,c from t1 where t1.a=t2.a) = ROW(a,3,'b'),(select c from t1 where a=t2.a) from t2;
 select a, (select a,b,c from t1 where t1.a=t2.a) = ROW(a,4,'c'),(select c from t1 where a=t2.a) from t2;
 drop table t1,t2;
+
+drop table if exists t;
+create table t (a int, b real, c varchar(10));
+insert into t values (1, 1, 'a'), (2,2,'b'), (NULL, 2, 'b');
+select ROW(1, 1, 'a') IN (select a,b,c from t);
+select ROW(1, 2, 'a') IN (select a,b,c from t);
+select ROW(1, 1, 'a') IN (select b,a,c from t);
+select ROW(1, 1, 'a') IN (select a,b,c from t where a is not null);
+select ROW(1, 2, 'a') IN (select a,b,c from t where a is not null);
+select ROW(1, 1, 'a') IN (select b,a,c from t where a is not null);
+select ROW(1, 1, 'a') IN (select a,b,c from t where c='b' or c='a');
+select ROW(1, 2, 'a') IN (select a,b,c from t where c='b' or c='a');
+select ROW(1, 1, 'a') IN (select b,a,c from t where c='b' or c='a');
+drop table if exists t;

sql/item.cc

@@ -498,6 +498,27 @@ bool Item_asterisk_remover::fix_fields(THD *thd,
   DBUG_RETURN(res);
 }
 
+bool Item_ref_on_list_position::fix_fields(THD *thd,
+					   struct st_table_list *tables,
+					   Item ** reference)
+{
+  ref= 0;
+  List_iterator<Item> li(list);
+  Item *item;
+  uint i= 0;
+  for (; (item= li++) && i < pos; i++);
+  if (i == pos)
+  {
+    ref= li.ref();
+    return Item_ref_null_helper::fix_fields(thd, tables, reference);
+  }
+  else
+  {
+    my_error(ER_CARDINALITY_COL, MYF(0), pos);
+    return 1;
+  }
+}
+
 double Item_ref_null_helper::val()
 {
   double tmp= (*ref)->val_result();
@@ -1196,6 +1217,8 @@ Item_cache* Item_cache::get_cache(Item_result type)
     return new Item_cache_real();
   case STRING_RESULT:
     return new Item_cache_str();
+  case ROW_RESULT:
+    return new Item_cache_row();
   default:
     // should never be in real life
     DBUG_ASSERT(0);
@@ -1241,6 +1264,92 @@ longlong Item_cache_str::val_int()
     return (longlong)0;
 }
 
+bool Item_cache_row::allocate(uint num)
+{
+  n= num;
+  THD *thd= current_thd;
+  if (!(values= (Item_cache **) thd->calloc(sizeof(Item_cache *)*n)))
+  {
+    my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
+    thd->fatal_error= 1;
+    return 1;
+  }
+  return 0;
+}
+
+bool Item_cache_row::setup(Item * item)
+{
+  if (!values && allocate(item->cols()))
+    return 1;
+  for(uint i= 0; i < n; i++)
+  {
+    if (!(values[i]= Item_cache::get_cache(item->el(i)->result_type())))
+    {
+      my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
+      current_thd->fatal_error= 1;
+      return 1;
+    }
+    values[i]->setup(item->el(i));
+  }
+  return 0;
+}
+
+void Item_cache_row::store(Item * item)
+{
+  null_value= 0;
+  item->bring_value();
+  for(uint i= 0; i < n; i++)
+  {
+    values[i]->store(item->el(i));
+    null_value|= values[i]->null_value;
+  }
+}
+
+void Item_cache_row::illegal_method_call(const char *method)
+{
+  DBUG_ENTER("Item_cache_row::illegal_method_call");
+  DBUG_PRINT("error", ("!!! %s method was called for row item", method));
+  DBUG_ASSERT(0);
+  my_error(ER_CARDINALITY_COL, MYF(0), 1);
+  DBUG_VOID_RETURN;
+}
+
+bool Item_cache_row::check_cols(uint c)
+{
+  if (c != n)
+  {
+    my_error(ER_CARDINALITY_COL, MYF(0), c);
+    return 1;
+  }
+  return 0;
+}
+
+bool Item_cache_row::null_inside()
+{
+  for (uint i= 0; i < n; i++)
+  {
+    if (values[i]->cols() > 1)
+    {
+      if (values[i]->null_inside())
+	return 1;
+    }
+    else
+    {
+      values[i]->val_int();
+      if (values[i]->null_value)
+	return 1;
+    }
+  }
+  return 0;
+}
+
+void Item_cache_row::bring_value()
+{
+  for (uint i= 0; i < n; i++)
+    values[i]->bring_value();
+  return;
+}
+
 /*****************************************************************************
 ** Instantiate templates
 *****************************************************************************/

sql/item.h

@@ -501,7 +501,7 @@ protected:
   Item_in_subselect* owner;
 public:
   Item_ref_null_helper(Item_in_subselect* master, Item **item,
-		       char *table_name_par,char *field_name_par):
+		       char *table_name_par, char *field_name_par):
     Item_ref(item, table_name_par, field_name_par), owner(master) {}
   double val();
   longlong val_int();
@@ -509,6 +509,24 @@ public:
   bool get_date(TIME *ltime, bool fuzzydate);
 };
 
+
+/*
+  Used to find item in list of select items after '*' items processing.
+*/
+class Item_ref_on_list_position: public Item_ref_null_helper
+{
+protected:
+  List<Item> &list;
+  uint pos;
+public:
+  Item_ref_on_list_position(Item_in_subselect* master,
+			    List<Item> &li, uint num,
+			    char *table_name, char *field_name):
+    Item_ref_null_helper(master, 0, table_name, field_name),
+    list(li), pos(num) {}
+  bool fix_fields(THD *, struct st_table_list *, Item ** ref);
+};
+
 /*
   To resolve '*' field moved to condition
   and register NULL values
@@ -642,6 +660,8 @@ public:
 class Item_cache: public Item
 {
 public:
+  virtual bool allocate(uint i) { return 0; };
+  virtual bool setup(Item *) { return 0; };
   virtual void store(Item *)= 0;
   void set_len_n_dec(uint32 max_len, uint8 dec)
   {
@@ -705,6 +725,54 @@ public:
   CHARSET_INFO *charset() const { return value->charset(); };
 };
 
+class Item_cache_row: public Item_cache
+{
+  Item_cache  **values;
+  uint n;
+public:
+  Item_cache_row(): values(0), n(2) { fixed= 1; null_value= 1; }
+  
+  /*
+    'allocate' used only in row transformer, to preallocate space for row 
+    cache.
+  */
+  bool allocate(uint num);
+  /*
+    'setup' is needed only by row => it not called by simple row subselect
+    (only by IN subselect (in subselect optimizer))
+  */
+  bool setup(Item *item);
+  void store(Item *item);
+  void illegal_method_call(const char *);
+  void make_field(Send_field *)
+  {
+    illegal_method_call((const char*)"make_field");
+  };
+  double val()
+  {
+    illegal_method_call((const char*)"val");
+    return 0;
+  };
+  longlong val_int()
+  {
+    illegal_method_call((const char*)"val_int");
+    return 0;
+  };
+  String *val_str(String *)
+  {
+    illegal_method_call((const char*)"val_str");
+    return 0;
+  };
+  enum Item_result result_type() const { return ROW_RESULT; }
+  
+  uint cols() { return n; }
+  Item* el(uint i) { return values[i]; }
+  Item** addr(uint i) { return (Item **) (values + i); }
+  bool check_cols(uint c);
+  bool null_inside();
+  void bring_value();
+};
+
 extern Item_buff *new_Item_buff(Item *item);
 extern Item_result item_cmp_type(Item_result a,Item_result b);
 extern Item *resolve_const_item(Item *item,Item *cmp_item);

sql/item_cmpfunc.cc

@@ -274,12 +274,19 @@ int Arg_comparator::compare_e_row()
   return 1;
 }
 
+bool Item_in_optimizer::preallocate_row()
+{
+  if ((cache= Item_cache::get_cache(ROW_RESULT)))
+    return 0;
+  my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
+  current_thd->fatal_error= 1;
+  return 1;
+}
+
 bool Item_in_optimizer::fix_fields(THD *thd, struct st_table_list *tables,
 				   Item ** ref)
 {
-  
+  if (args[0]->fix_fields(thd, tables, args))
-  if (args[0]->check_cols(allowed_arg_cols) ||
-      args[0]->fix_fields(thd, tables, args))
     return 1;
   if (args[0]->maybe_null)
     maybe_null=1;
@@ -288,15 +295,21 @@ bool Item_in_optimizer::fix_fields(THD *thd, struct st_table_list *tables,
   with_sum_func= args[0]->with_sum_func;
   used_tables_cache= args[0]->used_tables();
   const_item_cache= args[0]->const_item();
-  if (!(cache= Item_cache::get_cache(args[0]->result_type())))
+  if (!cache && !(cache= Item_cache::get_cache(args[0]->result_type())))
   {
     my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
     thd->fatal_error= 1;
     return 1;
   }
-  if (args[1]->check_cols(allowed_arg_cols) ||
+  cache->setup(args[0]);
-      args[1]->fix_fields(thd, tables, args))
+  if (args[1]->fix_fields(thd, tables, args))
     return 1;
+  Item_in_subselect * sub= (Item_in_subselect *)args[1];
+  if (args[0]->cols() != sub->engine->cols())
+  {
+    my_error(ER_CARDINALITY_COL, MYF(0), args[0]->cols());
+    return 1;
+  }
   if (args[1]->maybe_null)
     maybe_null=1;
   with_sum_func= with_sum_func || args[1]->with_sum_func;
@@ -1215,7 +1228,7 @@ void cmp_item_row::store_value(Item *item)
 {
   THD *thd= current_thd;
   n= item->cols();
-  if ((comparators= (cmp_item **) thd->alloc(sizeof(cmp_item *)*n)))
+  if ((comparators= (cmp_item **) thd->calloc(sizeof(cmp_item *)*n)))
   {
     item->bring_value();
     item->null_value= 0;

sql/item_cmpfunc.h

@@ -91,14 +91,15 @@ class Item_in_optimizer: public Item_bool_func
 protected:
   Item_cache *cache;
 public:
-  Item_in_optimizer(Item *a,Item *b):
+  Item_in_optimizer(Item *a, Item_in_subselect *b):
-    Item_bool_func(a,b), cache(0) {}
+    Item_bool_func(a, (Item *)b), cache(0) {}
+  // used by row in transformer
+  bool preallocate_row();
   bool fix_fields(THD *, struct st_table_list *, Item **);
   bool is_null();
   longlong val_int();
   
-  Item **get_cache() { return (Item**)&cache; }
+  Item_cache **get_cache() { return &cache; }
-
 };
 
 class Item_bool_func2 :public Item_int_func

sql/item_row.cc

@@ -41,7 +41,7 @@ void Item_row::illegal_method_call(const char *method)
   DBUG_ENTER("Item_row::illegal_method_call");
   DBUG_PRINT("error", ("!!! %s method was called for row item", method));
   DBUG_ASSERT(0);
-  my_error(ER_CARDINALITY_COL, MYF(0), arg_count);
+  my_error(ER_CARDINALITY_COL, MYF(0), 1);
   DBUG_VOID_RETURN;
 }
 
@@ -100,3 +100,10 @@ bool Item_row::null_inside()
   }
   return 0;
 }
+
+void Item_row::bring_value()
+{
+  for (uint i= 0; i < arg_count; i++)
+    items[i]->bring_value();
+  return;
+}

sql/item_row.h

@@ -70,4 +70,5 @@ public:
   Item** addr(uint i) { return items + i; }
   bool check_cols(uint c);
   bool null_inside();
+  void bring_value();
 };

sql/item_subselect.cc

@@ -127,36 +127,36 @@ inline table_map Item_subselect::used_tables() const
   return (table_map) engine->depended() ? 1L : 0L; 
 }
 
-Item_singleval_subselect::Item_singleval_subselect(THD *thd,
+Item_singlerow_subselect::Item_singlerow_subselect(THD *thd,
 						   st_select_lex *select_lex):
   Item_subselect(), value(0)
 {
-  DBUG_ENTER("Item_singleval_subselect::Item_singleval_subselect");
+  DBUG_ENTER("Item_singlerow_subselect::Item_singlerow_subselect");
-  init(thd, select_lex, new select_singleval_subselect(this));
+  init(thd, select_lex, new select_singlerow_subselect(this));
   max_columns= 1;
   maybe_null= 1;
   max_columns= UINT_MAX;
   DBUG_VOID_RETURN;
 }
 
-void Item_singleval_subselect::reset()
+void Item_singlerow_subselect::reset()
 {
   null_value= 1;
   if (value)
     value->null_value= 1;
 }
 
-void Item_singleval_subselect::store(uint i, Item *item)
+void Item_singlerow_subselect::store(uint i, Item *item)
 {
   row[i]->store(item);
 }
 
-enum Item_result Item_singleval_subselect::result_type() const
+enum Item_result Item_singlerow_subselect::result_type() const
 {
   return engine->type();
 }
 
-void Item_singleval_subselect::fix_length_and_dec()
+void Item_singlerow_subselect::fix_length_and_dec()
 {
   if ((max_columns= engine->cols()) == 1)
   {
@@ -182,12 +182,12 @@ void Item_singleval_subselect::fix_length_and_dec()
   }
 }
 
-uint Item_singleval_subselect::cols()
+uint Item_singlerow_subselect::cols()
 {
   return engine->cols();
 }
 
-bool Item_singleval_subselect::check_cols(uint c)
+bool Item_singlerow_subselect::check_cols(uint c)
 {
   if (c != engine->cols())
   {
@@ -197,7 +197,7 @@ bool Item_singleval_subselect::check_cols(uint c)
   return 0;
 }
 
-bool Item_singleval_subselect::null_inside()
+bool Item_singlerow_subselect::null_inside()
 {
   for (uint i= 0; i < max_columns ; i++)
   {
@@ -207,12 +207,12 @@ bool Item_singleval_subselect::null_inside()
   return 0;
 }
 
-void Item_singleval_subselect::bring_value()
+void Item_singlerow_subselect::bring_value()
 {
   engine->exec();
 }
 
-double Item_singleval_subselect::val () 
+double Item_singlerow_subselect::val () 
 {
   if (!engine->exec() && !value->null_value)
   {
@@ -226,7 +226,7 @@ double Item_singleval_subselect::val ()
   }
 }
 
-longlong Item_singleval_subselect::val_int () 
+longlong Item_singlerow_subselect::val_int () 
 {
   if (!engine->exec() && !value->null_value)
   {
@@ -240,7 +240,7 @@ longlong Item_singleval_subselect::val_int ()
   }
 }
 
-String *Item_singleval_subselect::val_str (String *str) 
+String *Item_singlerow_subselect::val_str (String *str) 
 {
   if (!engine->exec() && !value->null_value)
   {
@@ -293,7 +293,7 @@ Item_allany_subselect::Item_allany_subselect(THD *thd, Item * left_exp,
   left_expr= left_exp;
   func= f;
   init(thd, select_lex, new select_exists_subselect(this));
-  max_columns= UINT_MAX;
+  max_columns= 1;
   reset();
   // We need only 1 row to determinate existence
   select_lex->master_unit()->global_parameters->select_limit= 1;
@@ -305,6 +305,7 @@ void Item_exists_subselect::fix_length_and_dec()
 {
    decimals= 0;
    max_length= 1;
+   max_columns= engine->cols();
 }
 
 double Item_exists_subselect::val () 
@@ -409,7 +410,7 @@ void Item_in_subselect::single_value_transformer(st_select_lex *select_lex,
     As far as  Item_ref_in_optimizer do not substitude itself on fix_fields
     we can use same item for all selects.
   */
-  Item *expr= new Item_ref(optimizer->get_cache(), 
+  Item *expr= new Item_ref((Item**)optimizer->get_cache(), 
 			   (char *)"<no matter>",
 			   (char*)"<left expr>");
   select_lex->master_unit()->dependent= 1;
@@ -440,7 +441,7 @@ void Item_in_subselect::single_value_transformer(st_select_lex *select_lex,
 	  sl->having= item;
       else
 	if (sl->where)
-	  sl->where= new Item_cond_and(sl->having, item);
+	  sl->where= new Item_cond_and(sl->where, item);
 	else
 	  sl->where= item;
     }
@@ -498,10 +499,68 @@ void Item_in_subselect::single_value_transformer(st_select_lex *select_lex,
   DBUG_VOID_RETURN;
 }
 
+void Item_in_subselect::row_value_transformer(st_select_lex *select_lex,
+					      Item *left_expr)
+{
+  DBUG_ENTER("Item_in_subselect::row_value_transformer");
+  Item_in_optimizer *optimizer;
+  substitution= optimizer= new Item_in_optimizer(left_expr, this);
+  if (!optimizer)
+  {
+    current_thd->fatal_error= 1;
+    DBUG_VOID_RETURN;
+  }
+  select_lex->master_unit()->dependent= 1;
+  uint n= left_expr->cols();
+  if (optimizer->preallocate_row() || (*optimizer->get_cache())->allocate(n))
+    DBUG_VOID_RETURN;
+  for (SELECT_LEX * sl= select_lex; sl; sl= sl->next_select())
+  {
+    select_lex->dependent= 1;
+
+    Item *item= 0;
+    List_iterator_fast<Item> li(sl->item_list);
+    for (uint i= 0; i < n; i++)
+    {
+      Item *func=
+	new Item_ref_on_list_position(this, sl->item_list, i,
+					       (char *) "<no matter>",
+					       (char *) "<list ref>");
+      func=
+	Item_bool_func2::eq_creator(new Item_ref((*optimizer->get_cache())->
+						 addr(i), 
+						 (char *)"<no matter>",
+						 (char *)"<left expr>"),
+				    func);
+      if (!item)
+	item= func;
+      else
+	item= new Item_cond_and(item, func);
+    }
+
+    if (sl->having || sl->with_sum_func || sl->group_list.first ||
+	!sl->table_list.elements)
+      if (sl->having)
+	sl->having= new Item_cond_and(sl->having, item);
+      else
+	sl->having= item;
+    else
+      if (sl->where)
+	sl->where= new Item_cond_and(sl->where, item);
+      else
+	sl->where= item;
+  }
+  DBUG_VOID_RETURN;
+}
+
+
 void Item_in_subselect::select_transformer(st_select_lex *select_lex)
 {
-  single_value_transformer(select_lex, left_expr,
+  if (left_expr->cols() == 1)
-			   &Item_bool_func2::eq_creator);
+    single_value_transformer(select_lex, left_expr,
+			     &Item_bool_func2::eq_creator);
+  else
+    row_value_transformer(select_lex, left_expr);
 }
 
 void Item_allany_subselect::select_transformer(st_select_lex *select_lex)

sql/item_subselect.h

@@ -86,18 +86,19 @@ public:
   bool check_loop(uint id);
 
   friend class select_subselect;
+  friend class Item_in_optimizer;
 };
 
 /* single value subselect */
 
 class Item_cache;
-class Item_singleval_subselect :public Item_subselect
+class Item_singlerow_subselect :public Item_subselect
 {
 protected:
   Item_cache *value, **row;
 public:
-  Item_singleval_subselect(THD *thd, st_select_lex *select_lex);
+  Item_singlerow_subselect(THD *thd, st_select_lex *select_lex);
-  Item_singleval_subselect(Item_singleval_subselect *item):
+  Item_singlerow_subselect(Item_singlerow_subselect *item):
     Item_subselect(item)
   {
     value= item->value;
@@ -109,7 +110,7 @@ public:
   double val();
   longlong val_int ();
   String *val_str (String *);
-  Item *new_item() { return new Item_singleval_subselect(this); }
+  Item *new_item() { return new Item_singlerow_subselect(this); }
   enum Item_result result_type() const;
   void fix_length_and_dec();
 
@@ -120,7 +121,7 @@ public:
   bool null_inside();
   void bring_value();
 
-  friend class select_singleval_subselect;
+  friend class select_singlerow_subselect;
 };
 
 /* exists subselect */
@@ -174,6 +175,7 @@ public:
   virtual void select_transformer(st_select_lex *select_lex);
   void single_value_transformer(st_select_lex *select_lex,
 				Item *left_expr, compare_func_creator func);
+  void row_value_transformer(st_select_lex *select_lex, Item *left_expr);
   longlong val_int();
   double val();
   String *val_str(String*);

sql/sql_class.cc

@@ -916,10 +916,10 @@ select_subselect::select_subselect(Item_subselect *item)
   this->item=item;
 }
 
-bool select_singleval_subselect::send_data(List<Item> &items)
+bool select_singlerow_subselect::send_data(List<Item> &items)
 {
-  DBUG_ENTER("select_singleval_subselect::send_data");
+  DBUG_ENTER("select_singlerow_subselect::send_data");
-  Item_singleval_subselect *it= (Item_singleval_subselect *)item;
+  Item_singlerow_subselect *it= (Item_singlerow_subselect *)item;
   if (it->assigned())
   {
       my_message(ER_SUBSELECT_NO_1_ROW, ER(ER_SUBSELECT_NO_1_ROW), MYF(0));

sql/sql_class.h

@@ -824,10 +824,10 @@ public:
 };
 
 /* Single value subselect interface class */
-class select_singleval_subselect :public select_subselect
+class select_singlerow_subselect :public select_subselect
 {
 public:
-  select_singleval_subselect(Item_subselect *item):select_subselect(item){}
+  select_singlerow_subselect(Item_subselect *item):select_subselect(item){}
   bool send_data(List<Item> &items);
 };
 

sql/sql_yacc.yy

@@ -587,7 +587,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b,int *yystacksize);
 	simple_ident select_item2 expr opt_expr opt_else sum_expr in_sum_expr
 	table_wild opt_pad no_in_expr expr_expr simple_expr no_and_expr
 	using_list expr_or_default set_expr_or_default
-	param_marker singleval_subselect singleval_subselect_init
+	param_marker singlerow_subselect singlerow_subselect_init
 	exists_subselect exists_subselect_init
 
 %type <item_list>
@@ -2017,7 +2017,7 @@ simple_expr:
 	    $$= new Item_row(*$5);
 	  }
 	| EXISTS exists_subselect { $$= $2; }
-	| singleval_subselect   { $$= $1; }
+	| singlerow_subselect   { $$= $1; }
 	| '{' ident expr '}'	{ $$= $3; }
         | MATCH ident_list_arg AGAINST '(' expr ')'
           { Select->add_ftfunc_to_list((Item_func_match *)
@@ -4487,17 +4487,17 @@ union_option:
 	/* empty */ {}
 	| ALL {Select->master_unit()->union_option= 1;};
 
-singleval_subselect:
+singlerow_subselect:
-	subselect_start singleval_subselect_init
+	subselect_start singlerow_subselect_init
 	subselect_end
 	{
 	  $$= $2;
 	};
 
-singleval_subselect_init:
+singlerow_subselect_init:
 	select_init2
 	{
-	  $$= new Item_singleval_subselect(YYTHD,
+	  $$= new Item_singlerow_subselect(YYTHD,
 					   Lex->current_select->master_unit()->
                                              first_select());
 	};