database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-08-01 03:47:19 +03:00
Code Activity

MDEV-29587 Allowing insert into a view with columns that are not part the table

Browse Source 
We can check only fields which take part in inserts.
This commit is contained in:
Oleksandr Byelkin
2024-01-12 17:34:19 +01:00
parent bc2f155019
commit 8c5db7a187
7 changed files with 125 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
sql/sql_insert.cc
View File

@ -96,7 +96,8 @@ static void end_delayed_insert(THD *thd);
pthread_handler_t handle_delayed_insert(void *arg);
static void unlink_blobs(TABLE *table);
#endif
static bool check_view_insertability(THD *thd, TABLE_LIST *view);
static bool check_view_insertability(THD *thd, TABLE_LIST *view,
List<Item> &fields);
static int binlog_show_create_table_(THD *thd, TABLE *table,
Table_specification_st *create_info);
@ -311,7 +312,7 @@ static int check_insert_fields(THD *thd, TABLE_LIST *table_list,
if (check_key_in_view(thd, table_list) ||
(table_list->view &&
check_view_insertability(thd, table_list)))
check_view_insertability(thd, table_list, fields)))
{
my_error(ER_NON_INSERTABLE_TABLE, MYF(0), table_list->alias.str, "INSERT");
DBUG_RETURN(-1);
@ -1426,6 +1427,7 @@ abort:
check_view_insertability()
thd - thread handler
view - reference on VIEW
fields - fields used in insert
IMPLEMENTATION
A view is insertable if the folloings are true:
@ -1441,7 +1443,8 @@ abort:
TRUE - can't be used for insert
*/
static bool check_view_insertability(THD * thd, TABLE_LIST *view)
static bool check_view_insertability(THD *thd, TABLE_LIST *view,
List<Item> &fields)
{
uint num= view->view->first_select_lex()->item_list.elements;
TABLE *table= view->table;
@ -1452,6 +1455,8 @@ static bool check_view_insertability(THD * thd, TABLE_LIST *view)
uint32 *used_fields_buff= (uint32*)thd->alloc(used_fields_buff_size);
MY_BITMAP used_fields;
enum_column_usage saved_column_usage= thd->column_usage;
List_iterator_fast<Item> it(fields);
Item *ex;
DBUG_ENTER("check_key_in_view");
if (!used_fields_buff)
@ -1480,6 +1485,17 @@ static bool check_view_insertability(THD * thd, TABLE_LIST *view)
/* simple SELECT list entry (field without expression) */
if (!(field= trans->item->field_for_view_update()))
{
// Do not check fields which we are not inserting into
while((ex= it++))
{
// The field used in the INSERT
if (ex->real_item()->field_for_view_update() ==
trans->item->field_for_view_update())
break;
}
it.rewind();
if (!ex)
continue;
thd->column_usage= saved_column_usage;
DBUG_RETURN(TRUE);
}
@ -1494,11 +1510,12 @@ static bool check_view_insertability(THD * thd, TABLE_LIST *view)
}
thd->column_usage= saved_column_usage;
/* unique test */
for (trans= trans_start; trans != trans_end; trans++)
while((ex= it++))
{
/* Thanks to test above, we know that all columns are of type Item_field */
Item_field *field= (Item_field *)trans->item;
/* check fields belong to table in which we are inserting */
DBUG_ASSERT(ex->real_item()->field_for_view_update()->type() ==
Item::FIELD_ITEM);
Item_field *field= (Item_field *)ex->real_item()->field_for_view_update();
if (field->field->table == table &&
bitmap_fast_test_and_set(&used_fields, field->field->field_index))
DBUG_RETURN(TRUE);