fixed using VIEW fields (BUG#4617)

mysql-test/r/view.result:
  using VIEW fields several times in query resolved via temporary tables
mysql-test/t/view.test:
  using VIEW fields several times in query resolved via temporary tables
sql/item.h:
  fixed using of result_field by Item_ref
sql/sql_base.cc:
  Create Item_ref as reference on VIEW fields expression reference
sql/sql_insert.cc:
  privent creating Item_ref in insert list (where Item_fields should be)
sql/sql_lex.cc:
  Item_ref creation control
sql/sql_lex.h:
  Item_ref creation control
sql/sql_update.cc:
  privent creating Item_ref in insert list (where Item_fields should be) and creation Item_fields for UPDATE list
sql/table.cc:
  Do not create Item_ref for internal view of view processing

mysql-test/r/view.result

@@ -993,3 +993,18 @@ col1	col2
 5	Hello, view world
 drop view v2, v1;
 drop table t1;
+create table t1 (col1 char(5),col2 char(5));
+create view v1 (col1,col2) as select col1,col2 from t1;
+insert into v1 values('s1','p1'),('s1','p2'),('s1','p3'),('s1','p4'),('s2','p1'),('s3','p2'),('s4','p4');
+select distinct first.col2 from t1 first where first.col2 in (select second.col2 from t1 second where second.col1<>first.col1);
+col2
+p1
+p2
+p4
+select distinct first.col2 from v1 first where first.col2 in (select second.col2 from t1 second where second.col1<>first.col1);
+col2
+p1
+p2
+p4
+drop view v1;
+drop table t1;

mysql-test/t/view.test

@@ -922,3 +922,14 @@ update v2 set col2='Hello, view world';
 select * from t1;
 drop view v2, v1;
 drop table t1;
+
+#
+# using VIEW fields several times in query resolved via temporary tables
+#
+create table t1 (col1 char(5),col2 char(5));
+create view v1 (col1,col2) as select col1,col2 from t1;
+insert into v1 values('s1','p1'),('s1','p2'),('s1','p3'),('s1','p4'),('s2','p1'),('s3','p2'),('s4','p4');
+select distinct first.col2 from t1 first where first.col2 in (select second.col2 from t1 second where second.col1<>first.col1);
+select distinct first.col2 from v1 first where first.col2 in (select second.col2 from t1 second where second.col1<>first.col1);
+drop view v1;
+drop table t1;

sql/item.h

@@ -887,15 +887,15 @@ class Item_ref :public Item_ident
   Item *orig_item;                       /* things in 'cleanup()' */
   Item_ref(Item **hook, Item *original,const char *db_par,
 	   const char *table_name_par, const char *field_name_par)
-    :Item_ident(db_par,table_name_par,field_name_par),ref(0), hook_ptr(hook),
-    orig_item(original) {}
+    :Item_ident(db_par, table_name_par, field_name_par), result_field(0),
+     ref(0), hook_ptr(hook), orig_item(original) {}
   Item_ref(Item **item, Item **hook,
 	   const char *table_name_par, const char *field_name_par)
-    :Item_ident(NullS,table_name_par,field_name_par),
+    :Item_ident(NullS, table_name_par, field_name_par), result_field(0),
     ref(item), hook_ptr(hook), orig_item(hook ? *hook:0) {}
   // Constructor need to process subselect with temporary tables (see Item)
   Item_ref(THD *thd, Item_ref *item, Item **hook)
-    :Item_ident(thd, item), ref(item->ref), 
+    :Item_ident(thd, item), result_field(item->result_field), ref(item->ref),
     hook_ptr(hook), orig_item(hook ? *hook : 0) {}
   enum Type type() const		{ return REF_ITEM; }
   bool eq(const Item *item, bool binary_cmp) const
@@ -940,6 +940,7 @@ class Item_ref :public Item_ident
     return depended_from ? OUTER_REF_TABLE_BIT : (*ref)->used_tables(); 
   }
   void set_result_field(Field *field)	{ result_field= field; }
+  Field *get_tmp_table_field() { return result_field; }
   bool is_result_field() { return 1; }
   void save_in_result_field(bool no_conversions)
   {

sql/sql_base.cc

@@ -1955,7 +1955,6 @@ Field *find_field_in_table(THD *thd, TABLE_LIST *table_list,
     {
       if (strcmp(trans[i]->name, name) == 0)
       {
-	*ref= trans[i];
 #ifndef NO_EMBEDDED_ACCESS_CHECKS
 	if (check_grants_view &&
 	    check_grant_column(thd, &table_list->grant,
@@ -1964,6 +1963,21 @@ Field *find_field_in_table(THD *thd, TABLE_LIST *table_list,
 			       name, length))
 	  return WRONG_GRANT;
 #endif
+        if (thd->lex->current_select->no_wrap_view_item)
+          *ref= trans[i];
+        else
+        {
+          Item_arena *arena= thd->current_arena, backup;
+          if (arena)
+            thd->set_n_backup_item_arena(arena, &backup);
+          *ref= new Item_ref(trans + i, 0, table_list->view_name.str,
+                             name);
+          if (arena)
+            thd->restore_backup_item_arena(arena, &backup);
+          /* as far as Item_ref have defined refernce it do not need tables */
+          if (*ref)
+            (*ref)->fix_fields(thd, 0, ref);
+        }
 	return (Field*) view_ref_found;
       }
     }
@@ -2441,6 +2455,7 @@ int setup_fields(THD *thd, Item **ref_pointer_array, TABLE_LIST *tables,
 {
   reg2 Item *item;
   List_iterator<Item> it(fields);
+  SELECT_LEX *select_lex= thd->lex->current_select;
   DBUG_ENTER("setup_fields");
 
   thd->set_query_id=set_query_id;
@@ -2452,7 +2467,10 @@ int setup_fields(THD *thd, Item **ref_pointer_array, TABLE_LIST *tables,
   {
     if (!item->fixed && item->fix_fields(thd, tables, it.ref()) ||
 	(item= *(it.ref()))->check_cols(1))
+    {
+      select_lex->no_wrap_view_item= 0;
       DBUG_RETURN(-1); /* purecov: inspected */
+    }
     if (ref)
       *(ref++)= item;
     if (item->with_sum_func && item->type() != Item::SUM_FUNC_ITEM &&

sql/sql_insert.cc

@@ -76,6 +76,7 @@ check_insert_fields(THD *thd, TABLE_LIST *table_list, List<Item> &fields,
   else
   {						// Part field list
     TABLE_LIST *save_next= table_list->next_local;
+    int res;
     if (fields.elements != values.elements)
     {
       my_printf_error(ER_WRONG_VALUE_COUNT_ON_ROW,
@@ -86,12 +87,14 @@ check_insert_fields(THD *thd, TABLE_LIST *table_list, List<Item> &fields,
 
     table_list->next_local= 0;
     thd->dupp_field=0;
-    if (setup_fields(thd, 0, table_list, fields, 1, 0, 0))
-    {
+    thd->lex->select_lex.no_wrap_view_item= 1;
+    res= setup_fields(thd, 0, table_list, fields, 1, 0, 0);
+    thd->lex->select_lex.no_wrap_view_item= 0;
     table_list->next_local= save_next;
+    if (res)
+    {
       return -1;
     }
-    table_list->next_local= save_next;
 
     if (check_unique && thd->dupp_field)
     {

sql/sql_lex.cc

@@ -1005,6 +1005,7 @@ void st_select_lex::init_query()
   first_execution= 1;
   first_cond_optimization= 1;
   parsing_place= SELECT_LEX_NODE::NO_MATTER;
+  no_wrap_view_item= 0;
 }
 
 void st_select_lex::init_select()

sql/sql_lex.h

@@ -478,6 +478,8 @@ class st_select_lex: public st_select_lex_node
   bool subquery_in_having;
   bool first_execution; /* first execution in SP or PS */
   bool first_cond_optimization;
+  /* do not wrap view fields with Item_ref */
+  bool no_wrap_view_item;
 
   /* 
      SELECT for SELECT command st_select_lex. Used to privent scaning

sql/sql_update.cc

@@ -53,6 +53,7 @@ static bool compare_record(TABLE *table, ulong query_id)
 
   SYNOPSIS
     check_fields()
+    thd             thread handler
     items           Items for check
 
   RETURN
@@ -60,9 +61,9 @@ static bool compare_record(TABLE *table, ulong query_id)
     FALSE Items are OK
 */
 
-static bool check_fields(List<Item> &items)
+static bool check_fields(THD *thd, List<Item> &items)
 {
-  List_iterator_fast<Item> it(items);
+  List_iterator<Item> it(items);
   Item *item;
   while ((item= it++))
   {
@@ -72,6 +73,13 @@ static bool check_fields(List<Item> &items)
       my_error(ER_NONUPDATEABLE_COLUMN, MYF(0), item->name);
       return TRUE;
     }
+    /*
+      we make temporary copy of Item_field, to avoid influence of changing
+      result_field on Item_ref which refer on this field
+    */
+    Item_field *field= new Item_field(thd, (Item_field *)item);
+    it.replace(field);
+    ((Item_field *)item)->register_item_tree_changing(it.ref());
   }
   return FALSE;
 }
@@ -139,9 +147,14 @@ int mysql_update(THD *thd,
 #ifndef NO_EMBEDDED_ACCESS_CHECKS
   table_list->grant.want_privilege= table->grant.want_privilege= want_privilege;
 #endif
-  if (setup_fields(thd, 0, table_list, fields, 1, 0, 0))
+  {
+    thd->lex->select_lex.no_wrap_view_item= 1;
+    int res= setup_fields(thd, 0, table_list, fields, 1, 0, 0);
+    thd->lex->select_lex.no_wrap_view_item= 0;
+    if (res)
       DBUG_RETURN(-1);				/* purecov: inspected */
-  if (check_fields(fields))
+  }
+  if (table_list->view && check_fields(thd, fields))
   {
     DBUG_RETURN(-1);
   }
@@ -521,6 +534,8 @@ int mysql_multi_update_prepare(THD *thd)
   List<Item> *fields= &lex->select_lex.item_list;
   TABLE_LIST *tl;
   table_map tables_for_update= 0, readonly_tables= 0;
+  int res;
+  bool update_view= 0;
   DBUG_ENTER("mysql_multi_update_prepare");
   /*
     Ensure that we have update privilege for all tables and columns in the
@@ -545,9 +560,22 @@ int mysql_multi_update_prepare(THD *thd)
     time.
   */
   if (setup_tables(thd, table_list, &lex->select_lex.where) ||
-      setup_fields(thd, 0, table_list, *fields, 1, 0, 0))
+      (thd->lex->select_lex.no_wrap_view_item= 1,
+       res= setup_fields(thd, 0, table_list, *fields, 1, 0, 0),
+       thd->lex->select_lex.no_wrap_view_item= 0,
+       res))
     DBUG_RETURN(-1);
-  if (check_fields(*fields))
+
+  for (tl= table_list; tl ; tl= tl->next_local)
+  {
+    if (tl->view)
+    {
+      update_view= 1;
+      break;
+    }
+  }
+
+  if (update_view && check_fields(thd, *fields))
   {
     DBUG_RETURN(-1);
   }

sql/table.cc

@@ -1505,6 +1505,7 @@ bool st_table_list::setup_ancestor(THD *thd, Item **conds)
   List_iterator_fast<Item> it(select->item_list);
   uint i= 0;
   bool save_set_query_id= thd->set_query_id;
+  bool save_wrapper= thd->lex->select_lex.no_wrap_view_item;
   DBUG_ENTER("st_table_list::setup_ancestor");
 
   if (ancestor->ancestor &&
@@ -1542,6 +1543,8 @@ bool st_table_list::setup_ancestor(THD *thd, Item **conds)
 
   /* prevent look up in SELECTs tree */
   thd->lex->current_select= &thd->lex->select_lex;
+  thd->lex->select_lex.no_wrap_view_item= 1;
+
   /*
     Resolve all view items against ancestor table.
 
@@ -1596,6 +1599,7 @@ bool st_table_list::setup_ancestor(THD *thd, Item **conds)
   }
 
 ok:
+  thd->lex->select_lex.no_wrap_view_item= save_wrapper;
   thd->lex->current_select= current_select_save;
   thd->set_query_id= save_set_query_id;
   DBUG_RETURN(0);
@@ -1607,6 +1611,7 @@ bool st_table_list::setup_ancestor(THD *thd, Item **conds)
     thd->clear_error();
     my_error(ER_VIEW_INVALID, MYF(0), view_db.str, view_name.str);
   }
+  thd->lex->select_lex.no_wrap_view_item= save_wrapper;
   thd->lex->current_select= current_select_save;
   thd->set_query_id= save_set_query_id;
   DBUG_RETURN(1);