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Fix for bug#37526: asymertic operator <=> in trigger

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Problem: <=> operator may return wrong results 
comparing NULL and a DATE/DATETIME/TIME value.

Fix: properly check NULLs.


mysql-test/r/type_datetime.result:
  Fix for bug#37526: asymertic operator <=> in trigger
    - test result.
mysql-test/t/type_datetime.test:
  Fix for bug#37526: asymertic operator <=> in trigger
    - test case.
sql/item_cmpfunc.cc:
  Fix for bug#37526: asymertic operator <=> in trigger
    - if is_nulls_eq is TRUE Arg_comparator::compare_datetime() 
  should return 1 only if both arguments are NULL.
This commit is contained in:
Ramil Kalimullin
2008-09-09 20:05:27 +05:00
parent 788be2aebd
commit 776793a97c
3 changed files with 52 additions and 7 deletions
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16
mysql-test/t/type_datetime.test
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@ -388,4 +388,20 @@ where id in (select id from t2 as x1 where (t2.cur_date is null));
drop table t1,t2;
#
# Bug #37526: asymertic operator <=> in trigger
#
SELECT
CAST('NULL' AS DATE) <=> CAST('2008-01-01' AS DATE) n1,
CAST('2008-01-01' AS DATE) <=> CAST('NULL' AS DATE) n2,
CAST('NULL' AS DATE) <=> CAST('NULL' AS DATE) n3,
CAST('NULL' AS DATE) <> CAST('2008-01-01' AS DATE) n4,
CAST('2008-01-01' AS DATE) <> CAST('NULL' AS DATE) n5,
CAST('NULL' AS DATE) <> CAST('NULL' AS DATE) n6,
CAST('NULL' AS DATE) < CAST('2008-01-01' AS DATE) n7,
CAST('2008-01-01' AS DATE) < CAST('NULL' AS DATE) n8,
CAST('NULL' AS DATE) < CAST('NULL' AS DATE) n9;
--echo End of 5.0 tests