database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2026-01-06 05:22:24 +03:00
Code Activity

Bug#23411: ... MOD-ing zero returns strange result

Browse Source 
The Item_func_mod objects never had maybe_null set, so users had no reason 
to expect that they can be NULL, and may therefore deduce wrong results.
Now, set maybe_null.


mysql-test/r/func_test.result:
  Verify that the predictions are true.
mysql-test/t/func_test.test:
  Verify that the predictions are true.
sql/item_func.cc:
  MOD functions may be NULL.
This commit is contained in:
unknown
2006-11-06 17:13:19 -05:00
parent e1a722b2d3
commit 2b35fee8ab
4 changed files with 111 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

32
mysql-test/t/func_test.test
View File

@@ -108,4 +108,36 @@ select 5.1 mod 3, 5.1 mod -3, -5.1 mod 3, -5.1 mod -3;
select 5 mod 3, 5 mod -3, -5 mod 3, -5 mod -3;
#
# Bug#23411: The "%" (MOD) operator is not documented; MOD-ing zero returns strange result
# Manual: "Division by zero produces a NULL result"
#
select (12%0) <=> null as '1';
select (12%0) is null as '1';
select 12%0 as 'NULL';
select 12%2 as '0';
select 12%NULL as 'NULL';
select 12 % null as 'NULL';
select null % 12 as 'NULL';
select null % 0 as 'NULL';
select 0 % null as 'NULL';
select null % null as 'NULL';
select (12 mod 0) <=> null as '1';
select (12 mod 0) is null as '1';
select 12 mod 0 as 'NULL';
select 12 mod 2 as '0';
select 12 mod null as 'NULL';
select null mod 12 as 'NULL';
select null mod 0 as 'NULL';
select 0 mod null as 'NULL';
select null mod null as 'NULL';
select mod(12.0, 0) as 'NULL';
select mod(12, 0.0) as 'NULL';
select mod(12, NULL) as 'NULL';
select mod(12.0, NULL) as 'NULL';
select mod(NULL, 2) as 'NULL';
select mod(NULL, 2.0) as 'NULL';
# End of 4.1 tests