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Fix for BUG#7716: in in_string::set() take into account that the value returned

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by item->val_str() may be a substring of the passed string. 
Disallow string=its_substring assignment in String::operator=().


mysql-test/r/func_misc.result:
  Testcase for BUG#7716
mysql-test/t/func_misc.test:
  Testcase for BUG#7716
sql/item_cmpfunc.cc:
  Fix for BUG#7716: in in_string::set() take into account that the string returned 
  by item->val_str(S) may be not S but use the buffer owned by S.
sql/sql_string.h:
  * Added assert: String& String::operator=(const String&) may not be used to do 
    assignments like str = string_that_uses_buffer_owned_by_str
  * Added String::uses_buffer_owned_by().
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unknown
2005-02-04 09:14:22 +03:00
parent bd556f0d70
commit ebda548d0d
4 changed files with 50 additions and 0 deletions
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21
mysql-test/r/func_misc.result
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@@ -28,3 +28,24 @@ length(format('nan', 2)) > 0
select concat("$",format(2500,2));
concat("$",format(2500,2))
$2,500.00
create table t1 ( a timestamp );
insert into t1 values ( '2004-01-06 12:34' );
select a from t1 where left(a+0,6) in ( left(20040106,6) );
a
2004-01-06 12:34:00
select a from t1 where left(a+0,6) = ( left(20040106,6) );
a
2004-01-06 12:34:00
select a from t1 where right(a+0,6) in ( right(20040106123400,6) );
a
2004-01-06 12:34:00
select a from t1 where right(a+0,6) = ( right(20040106123400,6) );
a
2004-01-06 12:34:00
select a from t1 where mid(a+0,6,3) in ( mid(20040106123400,6,3) );
a
2004-01-06 12:34:00
select a from t1 where mid(a+0,6,3) = ( mid(20040106123400,6,3) );
a
2004-01-06 12:34:00
drop table t1;