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Fix of LP BUG#675248.

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Registration of pointer change if we assign it to other pointer which should be identical after statement execution (PS/SP).

mysql-test/r/subselect.result:
  Test suite.
mysql-test/t/subselect.test:
  Test suite.
sql/sql_class.cc:
  The procedure of the pointer registration.
sql/sql_class.h:
  The procedure of the pointer registration.
sql/sql_lex.cc:
  Registration of pointer change if we assign it to other pointer which should be identical after statement execution (PS/SP).
This commit is contained in:
unknown
2010-11-23 20:43:34 +02:00
parent 7840965db9
commit 34c8930c09
5 changed files with 95 additions and 4 deletions
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30
sql/sql_class.cc
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@ -1621,6 +1621,36 @@ void THD::nocheck_register_item_tree_change(Item **place, Item *old_value,
change_list.append(change);
}
/**
Check and register item change if needed
@param place place where we should assign new value
@param new_value place of the new value
@details
Let C be a reference to an item that changed the reference A
at the location (occurrence) L1 and this change has been registered.
If C is substituted for reference A another location (occurrence) L2
that is to be registered as well than this change has to be
consistent with the first change in order the procedure that rollback
changes to substitute the same reference at both locations L1 and L2.
*/
void THD::check_and_register_item_tree_change(Item **place, Item **new_value,
MEM_ROOT *runtime_memroot)
{
Item_change_record *change;
I_List_iterator<Item_change_record> it(change_list);
while ((change= it++))
{
if (change->place == new_value)
break; // we need only very first value
}
if (change)
nocheck_register_item_tree_change(place, change->old_value,
runtime_memroot);
}
void THD::rollback_item_tree_changes()
{