mirror/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2026-05-15 19:37:16 +02:00
Code Issues Projects Releases Packages Wiki Activity

Fix for bug #32260: User variables in query cause server crash

Browse source 
Problem: there's no guarantee that the user variable item's result_field
is assigned when we're adjusting its table read map.
  
Fix: check the result_field before using it.


mysql-test/r/user_var.result:
  Fix for bug #32260: User variables in query cause server crash
    - test result.
mysql-test/t/user_var.test:
  Fix for bug #32260: User variables in query cause server crash
    - test case.
sql/item_func.cc:
  Fix for bug #32260: User variables in query cause server crash
    - using the result_field ensure it is set.
This commit is contained in:
unknown 2007-11-17 11:20:50 +04:00
commit 011eb3dffe
3 changed files with 34 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

21
mysql-test/t/user_var.test
View file

@ -237,3 +237,24 @@ select @a:=f2, count(f2) from t1 group by 1 desc;
select @a:=f3, count(f3) from t1 group by 1 desc;
select @a:=f4, count(f4) from t1 group by 1 desc;
drop table t1;
#
# Bug #32260: User variables in query cause server crash
#
create table t1(a int);
insert into t1 values(5),(4),(4),(3),(2),(2),(2),(1);
set @rownum := 0;
set @rank := 0;
set @prev_score := NULL;
# Disable the result log as we assign a value to a user variable in one part
# of a statement and use the same variable in other part of the same statement,
# so we can get unexpected results.
--disable_result_log
select @rownum := @rownum + 1 as row,
@rank := IF(@prev_score!=a, @rownum, @rank) as rank,
@prev_score := a as score
from t1 order by score desc;
--enable_result_log
drop table t1;
--echo End of 5.1 tests