database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-30 16:24:05 +03:00
Code Activity

Fix for BUG#6976:

Browse Source 
In Item_ref::Item_ref set maybe_null (and other fields fix_fields sets) to be the 
same as in (*ref), because Item_ref::fix_fields() will not be called.  Previously 
maybe_null was 0 always and this produced a bogus state where 
maybe_null==0 && is_null() == true 
which broke evaluation for some upper-level Items, like AND and OR.


mysql-test/r/group_by.result:
  Test for BUG#6976
mysql-test/t/group_by.test:
  Test for BUG#6976
sql/item.cc:
  Comment added
sql/item.h:
  Fix for BUG#6976:
    in Item_ref::Item_ref(Item**...) fix all fields because fix_fields() will not be called.
This commit is contained in:
unknown
2004-12-11 19:59:09 +03:00
parent 9286d1c145
commit b5c119e7c0
4 changed files with 35 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
mysql-test/r/group_by.result
View File

@ -626,3 +626,15 @@ explain SELECT i, COUNT(DISTINCT(i)) FROM t1 GROUP BY j ORDER BY NULL;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 6 Using filesort
DROP TABLE t1;
create table t1 (a int);
insert into t1 values(null);
select min(a) is null from t1;
min(a) is null
1
select min(a) is null or null from t1;
min(a) is null or null
1
select 1 and min(a) is null from t1;
1 and min(a) is null
1
drop table t1;

9
mysql-test/t/group_by.test
View File

@ -447,3 +447,12 @@ INSERT INTO t1 VALUES (1,2),(2,3),(4,5),(3,5),(1,5),(23,5);
SELECT i, COUNT(DISTINCT(i)) FROM t1 GROUP BY j ORDER BY NULL;
explain SELECT i, COUNT(DISTINCT(i)) FROM t1 GROUP BY j ORDER BY NULL;
DROP TABLE t1;
#Test for BUG#6976: Aggregate functions have incorrect NULL-ness
create table t1 (a int);
insert into t1 values(null);
select min(a) is null from t1;
select min(a) is null or null from t1;
select 1 and min(a) is null from t1;
drop table t1;