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MDEV-9521 Least function returns 0000-00-00 for null date columns instead of null

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Item_func_ifnull::date_op() and Item_func_coalesce::date_op() could
erroneously return 0000-00-00 instead of NULL when get_date()
was called with the TIME_FUZZY_DATES flag, e.g. from LEAST().
This commit is contained in:
Alexander Barkov 2016-04-18 23:15:15 +04:00
parent 777c2131dd
commit 6fd54c01bb
3 changed files with 68 additions and 10 deletions
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35
mysql-test/r/type_date.result
View File

@ -440,3 +440,38 @@ id select_type table type possible_keys key key_len ref rows Extra
select 1 from t1 as t1_0 inner join t1 as t2 on (t1_0.a <=> now()) join t1 on 1;
1
drop table t1;
#
# MDEV-9521 Least function returns 0000-00-00 for null date columns instead of null
#
CREATE TABLE t1 (
id BIGINT NOT NULL,
date_debut DATE NOT NULL,
date_fin DATE DEFAULT NULL);
CREATE TABLE t2(
id BIGINT NOT NULL,
date_debut DATE NOT NULL,
date_fin DATE DEFAULT NULL);
INSERT INTO t1 VALUES (1,'2016-01-01','2016-01-31');
INSERT INTO t1 VALUES (2,'2016-02-01',null);
INSERT INTO t1 VALUES (3,'2016-03-01','2016-03-31');
INSERT INTO t1 VALUES (4,'2016-04-01',null);
INSERT INTO t2 VALUES (1,'2016-01-01','2016-01-31');
INSERT INTO t2 VALUES (2,'2016-02-01','2016-01-28');
INSERT INTO t2 VALUES (3,'2016-03-01',null);
INSERT INTO t2 VALUES (4,'2016-04-01',null);
SELECT t1.id,
GREATEST(t2.date_debut, t1.date_debut) AS date_debut,
LEAST(IFNULL(t2.date_fin, IFNULL(t1.date_fin, NULL)),
IFNULL(t1.date_fin, IFNULL(t2.date_fin, NULL))) AS date_fin
FROM t1 LEFT JOIN t2 ON (t1.id=t2.id);
id date_debut date_fin
1 2016-01-01 2016-01-31 00:00:00
2 2016-02-01 2016-01-28 00:00:00
3 2016-03-01 2016-03-31 00:00:00
4 2016-04-01 NULL
DROP TABLE t1,t2;
SELECT
LEAST(COALESCE(DATE(NULL), DATE(NULL)), COALESCE(DATE(NULL), DATE(NULL))) AS d0,
LEAST(IFNULL(DATE(NULL), DATE(NULL)), IFNULL(DATE(NULL), DATE(NULL))) AS d1;
d0 d1
NULL NULL

29
mysql-test/t/type_date.test
View File

@ -386,3 +386,32 @@ select 1 from t1 as t1_0 inner join t1 as t2 on (t1_0.a <=> now()) join t1 on 1;
select 1 from t1 as t1_0 inner join t1 as t2 on (t1_0.a <=> now()) join t1 on 1;
drop table t1;
--echo #
--echo # MDEV-9521 Least function returns 0000-00-00 for null date columns instead of null
--echo #
CREATE TABLE t1 (
id BIGINT NOT NULL,
date_debut DATE NOT NULL,
date_fin DATE DEFAULT NULL);
CREATE TABLE t2(
id BIGINT NOT NULL,
date_debut DATE NOT NULL,
date_fin DATE DEFAULT NULL);
INSERT INTO t1 VALUES (1,'2016-01-01','2016-01-31');
INSERT INTO t1 VALUES (2,'2016-02-01',null);
INSERT INTO t1 VALUES (3,'2016-03-01','2016-03-31');
INSERT INTO t1 VALUES (4,'2016-04-01',null);
INSERT INTO t2 VALUES (1,'2016-01-01','2016-01-31');
INSERT INTO t2 VALUES (2,'2016-02-01','2016-01-28');
INSERT INTO t2 VALUES (3,'2016-03-01',null);
INSERT INTO t2 VALUES (4,'2016-04-01',null);
SELECT t1.id,
GREATEST(t2.date_debut, t1.date_debut) AS date_debut,
LEAST(IFNULL(t2.date_fin, IFNULL(t1.date_fin, NULL)),
IFNULL(t1.date_fin, IFNULL(t2.date_fin, NULL))) AS date_fin
FROM t1 LEFT JOIN t2 ON (t1.id=t2.id);
DROP TABLE t1,t2;
SELECT
LEAST(COALESCE(DATE(NULL), DATE(NULL)), COALESCE(DATE(NULL), DATE(NULL))) AS d0,
LEAST(IFNULL(DATE(NULL), DATE(NULL)), IFNULL(DATE(NULL), DATE(NULL))) AS d1;

14
sql/item_cmpfunc.cc
View File

@ -2558,10 +2558,7 @@ bool Item_func_ifnull::date_op(MYSQL_TIME *ltime, uint fuzzydate)
DBUG_ASSERT(fixed == 1);
if (!args[0]->get_date(ltime, fuzzydate & ~TIME_FUZZY_DATES))
return (null_value= false);
if (!args[1]->get_date(ltime, fuzzydate & ~TIME_FUZZY_DATES))
return (null_value= false);
bzero((char*) ltime,sizeof(*ltime));
return null_value= !(fuzzydate & TIME_FUZZY_DATES);
return (null_value= args[1]->get_date(ltime, fuzzydate & ~TIME_FUZZY_DATES));
}
@ -3311,15 +3308,12 @@ double Item_func_coalesce::real_op()
bool Item_func_coalesce::date_op(MYSQL_TIME *ltime,uint fuzzydate)
{
DBUG_ASSERT(fixed == 1);
null_value= 0;
for (uint i= 0; i < arg_count; i++)
{
bool res= args[i]->get_date(ltime, fuzzydate & ~TIME_FUZZY_DATES);
if (!args[i]->null_value)
return res;
if (!args[i]->get_date(ltime, fuzzydate & ~TIME_FUZZY_DATES))
return (null_value= false);
}
bzero((char*) ltime,sizeof(*ltime));
return null_value|= !(fuzzydate & TIME_FUZZY_DATES);
return (null_value= true);
}