Bug#56271: Wrong comparison result with STR_TO_DATE function

The Item_func_str_to_date class wasn't providing correct integer DATETIME
representation as expected. This led to wrong comparison result and didn't
allowed the STR_TO_DATE function to be used with indexes.
Also, STR_TO_DATE function was inconsisted on throwing warnings/errors.
Fixed now.

val_int and result_as_longlong methods were added to the Item_func_str_to_date
class. 

mysql-test/r/func_time.result:
  Test case result adjusted after fixing bug#56271.
mysql-test/r/parser.result:
  Test case result adjusted after fixing bug#56271.
mysql-test/r/select.result:
  A test case result adjusted after fixing bug#56271.
mysql-test/r/strict.result:
  Test case result adjusted after fixing bug#56271.
mysql-test/r/type_datetime.result:
  Added a test case for the bug#56271.
mysql-test/t/strict.test:
  Test case adjusted after fixing bug#56271.
mysql-test/t/type_datetime.test:
  Added a test case for the bug#56271.
sql/item_timefunc.cc:
  Bug#56271: Wrong comparison result with STR_TO_DATE function
  val_int and result_as_longlong methods were added to the Item_func_str_to_date
  class. 
  Item_func_str_to_date::get_date now throws the ER_WRONG_VALUE_FOR_TYPE warning
  on incorrect value.
sql/item_timefunc.h:
  Bug#56271: Wrong comparison result with STR_TO_DATE function
  val_int and result_as_longlong methods were added to the Item_func_str_to_date
  class.

mysql-test/r/func_time.result

@@ -1200,6 +1200,8 @@ set time_zone= @@global.time_zone;
 select str_to_date('10:00 PM', '%h:%i %p') + INTERVAL 10 MINUTE;
 str_to_date('10:00 PM', '%h:%i %p') + INTERVAL 10 MINUTE
 NULL
+Warnings:
+Warning	1411	Incorrect datetime value: '10:00 PM' for function str_to_date
 create table t1 (field DATE);
 insert into t1 values ('2006-11-06');
 select * from t1 where field < '2006-11-06 04:08:36.0';

mysql-test/r/parser.result

@@ -556,9 +556,13 @@ DROP TABLE IF EXISTS t1;
 SELECT STR_TO_DATE('10:00 PM', '%h:%i %p') + INTERVAL 10 MINUTE;
 STR_TO_DATE('10:00 PM', '%h:%i %p') + INTERVAL 10 MINUTE
 NULL
+Warnings:
+Warning	1411	Incorrect datetime value: '10:00 PM' for function str_to_date
 SELECT STR_TO_DATE('10:00 PM', '%h:%i %p') + INTERVAL (INTERVAL(1,2,3) + 1) MINUTE;
 STR_TO_DATE('10:00 PM', '%h:%i %p') + INTERVAL (INTERVAL(1,2,3) + 1) MINUTE
 NULL
+Warnings:
+Warning	1411	Incorrect datetime value: '10:00 PM' for function str_to_date
 SELECT "1997-12-31 23:59:59" + INTERVAL 1 SECOND;
 "1997-12-31 23:59:59" + INTERVAL 1 SECOND
 1998-01-01 00:00:00

mysql-test/r/select.result

@@ -4171,9 +4171,10 @@ str_to_date('2007-10-00','%Y-%m-%d') between '2007/09/01 00:00:00'
 set SQL_MODE=TRADITIONAL;
 select str_to_date('2007-10-00 12:34','%Y-%m-%d %H:%i') = '2007-10-00 12:34';
 str_to_date('2007-10-00 12:34','%Y-%m-%d %H:%i') = '2007-10-00 12:34'
-0
+NULL
 Warnings:
 Warning	1292	Truncated incorrect datetime value: '2007-10-00 12:34'
+Warning	1411	Incorrect datetime value: '2007-10-00 12:34' for function str_to_date
 select str_to_date('2007-10-01 12:34','%Y-%m-%d %H:%i') = '2007-10-00 12:34';
 str_to_date('2007-10-01 12:34','%Y-%m-%d %H:%i') = '2007-10-00 12:34'
 0
@@ -4181,17 +4182,16 @@ Warnings:
 Warning	1292	Truncated incorrect datetime value: '2007-10-00 12:34'
 select str_to_date('2007-10-00 12:34','%Y-%m-%d %H:%i') = '2007-10-01 12:34';
 str_to_date('2007-10-00 12:34','%Y-%m-%d %H:%i') = '2007-10-01 12:34'
-0
+NULL
 Warnings:
-Warning	1292	Truncated incorrect datetime value: '2007-10-00 12:34:00'
+Warning	1411	Incorrect datetime value: '2007-10-00 12:34' for function str_to_date
 select str_to_date('2007-10-00','%Y-%m-%d') between '2007/09/01'
                                                 and '2007/10/20';
 str_to_date('2007-10-00','%Y-%m-%d') between '2007/09/01'
                                                 and '2007/10/20'
-0
+NULL
 Warnings:
-Warning	1292	Incorrect datetime value: '2007-10-00' for column '2007/09/01' at row 1
-Warning	1292	Incorrect datetime value: '2007-10-00' for column '2007/10/20' at row 1
+Warning	1411	Incorrect datetime value: '2007-10-00' for function str_to_date
 set SQL_MODE=DEFAULT;
 select str_to_date('2007-10-00','%Y-%m-%d') between '' and '2007/10/20';
 str_to_date('2007-10-00','%Y-%m-%d') between '' and '2007/10/20'

mysql-test/r/strict.result

@@ -206,12 +206,11 @@ INSERT INTO t1 (col1) VALUES (STR_TO_DATE('15.10.2004','%d.%m.%Y'));
 INSERT INTO t1 (col2) VALUES (STR_TO_DATE('15.10.2004 10.15','%d.%m.%Y %H.%i'));
 INSERT INTO t1 (col3) VALUES (STR_TO_DATE('15.10.2004 10.15','%d.%m.%Y %H.%i'));
 INSERT INTO t1 (col1) VALUES(STR_TO_DATE('31.10.0000 15.30','%d.%m.%Y %H.%i'));
-Warnings:
-Note	1265	Data truncated for column 'col1' at row 1
+ERROR HY000: Incorrect datetime value: '31.10.0000 15.30' for function str_to_date
 INSERT INTO t1 (col1) VALUES(STR_TO_DATE('31.0.2004 15.30','%d.%m.%Y %H.%i'));
-ERROR 22007: Incorrect date value: '2004-00-31 15:30:00' for column 'col1' at row 1
+ERROR HY000: Incorrect datetime value: '31.0.2004 15.30' for function str_to_date
 INSERT INTO t1 (col1) VALUES(STR_TO_DATE('0.10.2004 15.30','%d.%m.%Y %H.%i'));
-ERROR 22007: Incorrect date value: '2004-10-00 15:30:00' for column 'col1' at row 1
+ERROR HY000: Incorrect datetime value: '0.10.2004 15.30' for function str_to_date
 INSERT INTO t1 (col1) VALUES(STR_TO_DATE('31.9.2004 15.30','%d.%m.%Y %H.%i'));
 ERROR 22007: Incorrect date value: '2004-09-31 15:30:00' for column 'col1' at row 1
 INSERT INTO t1 (col1) VALUES(STR_TO_DATE('32.10.2004 15.30','%d.%m.%Y %H.%i'));
@@ -221,12 +220,13 @@ ERROR 22007: Incorrect date value: '2003-02-29 15:30:00' for column 'col1' at ro
 INSERT INTO t1 (col1) VALUES(STR_TO_DATE('15.13.2004 15.30','%d.%m.%Y %H.%i'));
 ERROR HY000: Incorrect datetime value: '15.13.2004 15.30' for function str_to_date
 INSERT INTO t1 (col1) VALUES(STR_TO_DATE('00.00.0000','%d.%m.%Y'));
-ERROR 22007: Incorrect date value: '0000-00-00' for column 'col1' at row 1
+ERROR HY000: Incorrect datetime value: '00.00.0000' for function str_to_date
 INSERT INTO t1 (col2) VALUES(STR_TO_DATE('31.10.0000 15.30','%d.%m.%Y %H.%i'));
+ERROR HY000: Incorrect datetime value: '31.10.0000 15.30' for function str_to_date
 INSERT INTO t1 (col2) VALUES(STR_TO_DATE('31.0.2004 15.30','%d.%m.%Y %H.%i'));
-ERROR 22007: Incorrect datetime value: '2004-00-31 15:30:00' for column 'col2' at row 1
+ERROR HY000: Incorrect datetime value: '31.0.2004 15.30' for function str_to_date
 INSERT INTO t1 (col2) VALUES(STR_TO_DATE('0.10.2004 15.30','%d.%m.%Y %H.%i'));
-ERROR 22007: Incorrect datetime value: '2004-10-00 15:30:00' for column 'col2' at row 1
+ERROR HY000: Incorrect datetime value: '0.10.2004 15.30' for function str_to_date
 INSERT INTO t1 (col2) VALUES(STR_TO_DATE('31.9.2004 15.30','%d.%m.%Y %H.%i'));
 ERROR 22007: Incorrect datetime value: '2004-09-31 15:30:00' for column 'col2' at row 1
 INSERT INTO t1 (col2) VALUES(STR_TO_DATE('32.10.2004 15.30','%d.%m.%Y %H.%i'));
@@ -236,13 +236,13 @@ ERROR 22007: Incorrect datetime value: '2003-02-29 15:30:00' for column 'col2' a
 INSERT INTO t1 (col2) VALUES(STR_TO_DATE('15.13.2004 15.30','%d.%m.%Y %H.%i'));
 ERROR HY000: Incorrect datetime value: '15.13.2004 15.30' for function str_to_date
 INSERT INTO t1 (col2) VALUES(STR_TO_DATE('00.00.0000','%d.%m.%Y'));
-ERROR 22007: Incorrect datetime value: '0000-00-00' for column 'col2' at row 1
+ERROR HY000: Incorrect datetime value: '00.00.0000' for function str_to_date
 INSERT INTO t1 (col3) VALUES(STR_TO_DATE('31.10.0000 15.30','%d.%m.%Y %H.%i'));
-ERROR 22007: Incorrect datetime value: '0000-10-31 15:30:00' for column 'col3' at row 1
+ERROR HY000: Incorrect datetime value: '31.10.0000 15.30' for function str_to_date
 INSERT INTO t1 (col3) VALUES(STR_TO_DATE('31.0.2004 15.30','%d.%m.%Y %H.%i'));
-ERROR 22007: Incorrect datetime value: '2004-00-31 15:30:00' for column 'col3' at row 1
+ERROR HY000: Incorrect datetime value: '31.0.2004 15.30' for function str_to_date
 INSERT INTO t1 (col3) VALUES(STR_TO_DATE('0.10.2004 15.30','%d.%m.%Y %H.%i'));
-ERROR 22007: Incorrect datetime value: '2004-10-00 15:30:00' for column 'col3' at row 1
+ERROR HY000: Incorrect datetime value: '0.10.2004 15.30' for function str_to_date
 INSERT INTO t1 (col3) VALUES(STR_TO_DATE('31.9.2004 15.30','%d.%m.%Y %H.%i'));
 ERROR 22007: Incorrect datetime value: '2004-09-31 15:30:00' for column 'col3' at row 1
 INSERT INTO t1 (col3) VALUES(STR_TO_DATE('32.10.2004 15.30','%d.%m.%Y %H.%i'));
@@ -252,7 +252,7 @@ ERROR 22007: Incorrect datetime value: '2003-02-29 15:30:00' for column 'col3' a
 INSERT INTO t1 (col3) VALUES(STR_TO_DATE('15.13.2004 15.30','%d.%m.%Y %H.%i'));
 ERROR HY000: Incorrect datetime value: '15.13.2004 15.30' for function str_to_date
 INSERT INTO t1 (col3) VALUES(STR_TO_DATE('00.00.0000','%d.%m.%Y'));
-ERROR 22007: Incorrect datetime value: '0000-00-00' for column 'col3' at row 1
+ERROR HY000: Incorrect datetime value: '00.00.0000' for function str_to_date
 drop table t1;
 CREATE TABLE t1 (col1 date, col2 datetime, col3 timestamp);
 INSERT INTO t1 (col1) VALUES (CAST('2004-10-15' AS DATE));
@@ -1108,6 +1108,9 @@ Warnings:
 Warning	1411	Incorrect datetime value: '2004.12.12 10:22:61' for function str_to_date
 Warning	1411	Incorrect datetime value: '2004.12.12 10:22:61' for function str_to_date
 Warning	1411	Incorrect datetime value: '2004.12.12 10:22:61' for function str_to_date
+Warning	1411	Incorrect datetime value: '2004.12.12 10:22:61' for function str_to_date
+Warning	1411	Incorrect datetime value: '2004.12.12 10:22:61' for function str_to_date
+Warning	1411	Incorrect datetime value: '2004.12.12 10:22:61' for function str_to_date
 drop table t1;
 create table t1 (col1 char(3), col2 integer);
 insert into t1 (col1) values (cast(1000 as char(3)));

mysql-test/r/type_datetime.result

@@ -655,5 +655,30 @@ Note	1003	select `test`.`t1`.`Id` AS `Id`,`test`.`t1`.`AtTime` AS `AtTime` from
 DROP TABLE t1;
 SET NAMES latin1;
 #
+# Bug#56271: Wrong comparison result with STR_TO_DATE function
+#
+CREATE TABLE t1 (
+`year` int(4) NOT NULL,
+`month` int(2) NOT NULL
+);
+INSERT INTO t1 VALUES (2010,3),(2010,4),(2009,8),(2008,9);
+SELECT *
+FROM t1
+WHERE STR_TO_DATE(CONCAT_WS('/01/',`month`,`year`), '%m/%d/%Y') >=
+STR_TO_DATE('1/1/2010', '%m/%d/%Y');
+year	month
+2010	3
+2010	4
+create table t2(f1 datetime primary key);
+insert into t2 select STR_TO_DATE(CONCAT_WS('/01/',`month`,`year`), '%m/%d/%Y') from t1;
+select * from t2 where f1=STR_TO_DATE('4/1/2010', '%m/%d/%Y');
+f1
+2010-04-01 00:00:00
+t2 should be const
+explain select * from t2 where f1=STR_TO_DATE('4/1/2010', '%m/%d/%Y');
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	const	PRIMARY	PRIMARY	8	const	1	Using index
+DROP TABLE t1,t2;
+#
 # End of 5.5 tests
 #

mysql-test/t/strict.test

@@ -192,11 +192,11 @@ INSERT INTO t1 (col3) VALUES (STR_TO_DATE('15.10.2004 10.15','%d.%m.%Y %H.%i'));
 #       All test cases expected to fail should return 
 #       SQLSTATE 22007 <invalid date value>
 
+--error 1411
 INSERT INTO t1 (col1) VALUES(STR_TO_DATE('31.10.0000 15.30','%d.%m.%Y %H.%i'));
-
---error 1292
+--error 1411
 INSERT INTO t1 (col1) VALUES(STR_TO_DATE('31.0.2004 15.30','%d.%m.%Y %H.%i'));
---error 1292
+--error 1411
 INSERT INTO t1 (col1) VALUES(STR_TO_DATE('0.10.2004 15.30','%d.%m.%Y %H.%i'));
 --error 1292
 INSERT INTO t1 (col1) VALUES(STR_TO_DATE('31.9.2004 15.30','%d.%m.%Y %H.%i'));
@@ -206,18 +206,18 @@ INSERT INTO t1 (col1) VALUES(STR_TO_DATE('32.10.2004 15.30','%d.%m.%Y %H.%i'));
 INSERT INTO t1 (col1) VALUES(STR_TO_DATE('29.02.2003 15.30','%d.%m.%Y %H.%i'));
 --error 1411
 INSERT INTO t1 (col1) VALUES(STR_TO_DATE('15.13.2004 15.30','%d.%m.%Y %H.%i'));
---error 1292
+--error 1411
 INSERT INTO t1 (col1) VALUES(STR_TO_DATE('00.00.0000','%d.%m.%Y'));
 
 ## Test INSERT with STR_TO_DATE into DATETIME
 #       All test cases expected to fail should return 
 #       SQLSTATE 22007 <invalid datetime value>
 
+--error 1411
 INSERT INTO t1 (col2) VALUES(STR_TO_DATE('31.10.0000 15.30','%d.%m.%Y %H.%i'));
-
---error 1292
+--error 1411
 INSERT INTO t1 (col2) VALUES(STR_TO_DATE('31.0.2004 15.30','%d.%m.%Y %H.%i'));
---error 1292
+--error 1411
 INSERT INTO t1 (col2) VALUES(STR_TO_DATE('0.10.2004 15.30','%d.%m.%Y %H.%i'));
 --error 1292
 INSERT INTO t1 (col2) VALUES(STR_TO_DATE('31.9.2004 15.30','%d.%m.%Y %H.%i'));
@@ -227,18 +227,18 @@ INSERT INTO t1 (col2) VALUES(STR_TO_DATE('32.10.2004 15.30','%d.%m.%Y %H.%i'));
 INSERT INTO t1 (col2) VALUES(STR_TO_DATE('29.02.2003 15.30','%d.%m.%Y %H.%i'));
 --error 1411
 INSERT INTO t1 (col2) VALUES(STR_TO_DATE('15.13.2004 15.30','%d.%m.%Y %H.%i'));
---error 1292
+--error 1411
 INSERT INTO t1 (col2) VALUES(STR_TO_DATE('00.00.0000','%d.%m.%Y'));
 
 ## Test INSERT with STR_TO_DATE into TIMESTAMP
 #       All test cases expected to fail should return 
 #       SQLSTATE 22007 <invalid datetime value>
 
---error 1292
+--error 1411
 INSERT INTO t1 (col3) VALUES(STR_TO_DATE('31.10.0000 15.30','%d.%m.%Y %H.%i'));
---error 1292
+--error 1411
 INSERT INTO t1 (col3) VALUES(STR_TO_DATE('31.0.2004 15.30','%d.%m.%Y %H.%i'));
---error 1292
+--error 1411
 INSERT INTO t1 (col3) VALUES(STR_TO_DATE('0.10.2004 15.30','%d.%m.%Y %H.%i'));
 --error 1292
 INSERT INTO t1 (col3) VALUES(STR_TO_DATE('31.9.2004 15.30','%d.%m.%Y %H.%i'));
@@ -248,7 +248,7 @@ INSERT INTO t1 (col3) VALUES(STR_TO_DATE('32.10.2004 15.30','%d.%m.%Y %H.%i'));
 INSERT INTO t1 (col3) VALUES(STR_TO_DATE('29.02.2003 15.30','%d.%m.%Y %H.%i'));
 --error 1411
 INSERT INTO t1 (col3) VALUES(STR_TO_DATE('15.13.2004 15.30','%d.%m.%Y %H.%i'));
---error 1292
+--error 1411
 INSERT INTO t1 (col3) VALUES(STR_TO_DATE('00.00.0000','%d.%m.%Y'));
 
 drop table t1;

mysql-test/t/type_datetime.test

@@ -461,6 +461,29 @@ EXPLAIN EXTENDED SELECT * FROM t1 FORCE INDEX(attime) WHERE AtTime = '2010-02-22
 DROP TABLE t1;
 SET NAMES latin1;
 
+--echo #
+--echo # Bug#56271: Wrong comparison result with STR_TO_DATE function
+--echo #
+CREATE TABLE t1 (
+  `year` int(4) NOT NULL,
+  `month` int(2) NOT NULL
+);
+
+INSERT INTO t1 VALUES (2010,3),(2010,4),(2009,8),(2008,9);
+
+SELECT *
+FROM t1
+WHERE STR_TO_DATE(CONCAT_WS('/01/',`month`,`year`), '%m/%d/%Y') >=
+STR_TO_DATE('1/1/2010', '%m/%d/%Y');
+
+create table t2(f1 datetime primary key);
+insert into t2 select STR_TO_DATE(CONCAT_WS('/01/',`month`,`year`), '%m/%d/%Y') from t1;
+select * from t2 where f1=STR_TO_DATE('4/1/2010', '%m/%d/%Y');
+--echo t2 should be const
+explain select * from t2 where f1=STR_TO_DATE('4/1/2010', '%m/%d/%Y');
+
+DROP TABLE t1,t2;
+
 --echo #
 --echo # End of 5.5 tests
 --echo #

sql/item_timefunc.cc

@@ -3368,6 +3368,8 @@ void Item_func_str_to_date::fix_length_and_dec()
   cached_field_type= MYSQL_TYPE_DATETIME;
   max_length= MAX_DATETIME_FULL_WIDTH*MY_CHARSET_BIN_MB_MAXLEN;
   cached_timestamp_type= MYSQL_TIMESTAMP_NONE;
+  sql_mode= (current_thd->variables.sql_mode &
+             (MODE_NO_ZERO_IN_DATE | MODE_NO_ZERO_DATE));
   if ((const_item= args[1]->const_item()))
   {
     char format_buff[64];
@@ -3433,6 +3435,14 @@ bool Item_func_str_to_date::get_date(MYSQL_TIME *ltime, uint fuzzy_date)
   return 0;
 
 null_date:
+  if (fuzzy_date & TIME_NO_ZERO_DATE)
+  {
+    char buff[128];
+    strmake(buff, val->ptr(), min(val->length(), sizeof(buff)-1));
+    push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
+                        ER_WRONG_VALUE_FOR_TYPE, ER(ER_WRONG_VALUE_FOR_TYPE),
+                        "datetime", buff, "str_to_date");
+  }
   return (null_value=1);
 }
 
@@ -3442,7 +3452,7 @@ String *Item_func_str_to_date::val_str(String *str)
   DBUG_ASSERT(fixed == 1);
   MYSQL_TIME ltime;
 
-  if (Item_func_str_to_date::get_date(&ltime, TIME_FUZZY_DATE))
+  if (Item_func_str_to_date::get_date(&ltime, TIME_FUZZY_DATE | sql_mode))
     return 0;
 
   if (!make_datetime((const_item ? cached_format_type :
@@ -3453,6 +3463,29 @@ String *Item_func_str_to_date::val_str(String *str)
 }
 
 
+longlong Item_func_str_to_date::val_int()
+{
+  DBUG_ASSERT(fixed == 1);
+  MYSQL_TIME ltime;
+
+  if (Item_func_str_to_date::get_date(&ltime, TIME_FUZZY_DATE | sql_mode))
+    return 0;
+
+  if (const_item)
+  {
+    switch (cached_field_type) {
+    case MYSQL_TYPE_DATE:
+      return TIME_to_ulonglong_date(&ltime);
+    case MYSQL_TYPE_TIME:
+      return TIME_to_ulonglong_time(&ltime);
+    default:
+      return TIME_to_ulonglong_datetime(&ltime);
+    }
+  }
+  return TIME_to_ulonglong_datetime(&ltime);
+}
+
+
 bool Item_func_last_day::get_date(MYSQL_TIME *ltime, uint fuzzy_date)
 {
   if (get_arg0_date(ltime, fuzzy_date & ~TIME_FUZZY_DATE) ||

sql/item_timefunc.h

@@ -1039,6 +1039,7 @@ class Item_func_str_to_date :public Item_str_func
   date_time_format_types cached_format_type;
   timestamp_type cached_timestamp_type;
   bool const_item;
+  ulonglong sql_mode;
 public:
   Item_func_str_to_date(Item *a, Item *b)
     :Item_str_func(a, b), const_item(false)
@@ -1052,6 +1053,8 @@ public:
   {
     return tmp_table_field_from_field_type(table, 1);
   }
+  longlong val_int();
+  bool result_as_longlong() { return TRUE; }
 };