MDEV-17318 CAST(LEAST(zero_date,non_zero_date) AS numeric_data_type) returns a wrong result

Also fixes:
MDEV-17330 Wrong result for 0 + LEAST(TIME'-10:00:00',TIME'10:00:00')

Problems:

1. These methods did not take into account the current session date flags
and passed date_mode_t(0) to func->get_date():

Type_handler_temporal_result::Item_func_min_max_val_real
Type_handler_temporal_result::Item_func_min_max_val_int
Type_handler_temporal_result::Item_func_min_max_val_decimal

Fixing to pass sql_mode_for_dates(thd) instead of date_mode_t(0).
Note, sql_mode_for_dates(thd) is only needed for DATE/DATETIME
data types. It is not needed for TIME.
So splitting value methods Type_handler_temporal_result::Item_func_min_max_xxx
into individual implementations for
Type_handler_{time|date|datetime|timestamp}_common
and, instead of calling get_date(), reusing inside classes
Time(), Date(), Datetime() and their methods to_longlong().
sql_mode_for_dates(thd) is automatically passed to get_date()
inside Date() and Datetime() constructors.

The switch to classes also fixed the problem reported in MDEV-17330.
Type_handler_temporal_result::Item_func_min_max_val_int() used to
call TIME_to_ulonglong(), which was not correct for TIME.
Changing the code to use Time().to_longlong() solved this.

2. Type_handler_temporal_result::Item_func_min_max_get_date
also did not take into account the current session
date flags in case of conversion from DATE/DATETIME to time
and passed date_mode_t(0) to get_date_native().
Fixing to pass sql_mode_for_dates(thd) in case of conversion
from DATE/DATETIME to TIME.

mysql-test/main/func_hybrid_type.result

@@ -3873,5 +3873,75 @@ t1	CREATE TABLE `t1` (
 DROP TABLE t1;
 SET sql_mode=DEFAULT;
 #
+# MDEV-17318 CAST(LEAST(zero_date,non_zero_date) AS numeric_data_type) returns a wrong result
+#
+SET sql_mode='NO_ZERO_DATE,NO_ZERO_IN_DATE';
+SELECT
+LEAST('0000-00-00',DATE'2001-01-01') AS c0,
+CAST(LEAST('0000-00-00',DATE'2001-01-01') AS CHAR) AS string,
+CAST(LEAST('0000-00-00',DATE'2001-01-01') AS DATE) AS date,
+CAST(LEAST('0000-00-00',DATE'2001-01-01') AS DATETIME) AS datetime,
+CAST(LEAST('0000-00-00',DATE'2001-01-01') AS TIME) AS time,
+CAST(LEAST('0000-00-00',DATE'2001-01-01') AS DECIMAL) AS dc,
+CAST(LEAST('0000-00-00',DATE'2001-01-01') AS DOUBLE) AS dbl,
+CAST(LEAST('0000-00-00',DATE'2001-01-01') AS SIGNED) AS sint,
+CAST(LEAST('0000-00-00',DATE'2001-01-01') AS UNSIGNED) AS uint;
+c0	string	date	datetime	time	dc	dbl	sint	uint
+NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL
+Warnings:
+Warning	1292	Incorrect datetime value: '0000-00-00'
+Warning	1292	Incorrect datetime value: '0000-00-00'
+Warning	1292	Incorrect datetime value: '0000-00-00'
+Warning	1292	Incorrect datetime value: '0000-00-00'
+Warning	1292	Incorrect datetime value: '0000-00-00'
+Warning	1292	Incorrect datetime value: '0000-00-00'
+Warning	1292	Incorrect datetime value: '0000-00-00'
+Warning	1292	Incorrect datetime value: '0000-00-00'
+Warning	1292	Incorrect datetime value: '0000-00-00'
+CREATE TABLE t1 AS SELECT
+LEAST('0000-00-00',DATE'2001-01-01') AS c0,
+CAST(LEAST('0000-00-00',DATE'2001-01-01') AS CHAR) AS string,
+CAST(LEAST('0000-00-00',DATE'2001-01-01') AS DATE) AS date,
+CAST(LEAST('0000-00-00',DATE'2001-01-01') AS DATETIME) AS datetime,
+CAST(LEAST('0000-00-00',DATE'2001-01-01') AS TIME) AS time,
+CAST(LEAST('0000-00-00',DATE'2001-01-01') AS DECIMAL) AS dc,
+CAST(LEAST('0000-00-00',DATE'2001-01-01') AS DOUBLE) AS dbl,
+CAST(LEAST('0000-00-00',DATE'2001-01-01') AS SIGNED) AS sint,
+CAST(LEAST('0000-00-00',DATE'2001-01-01') AS UNSIGNED) AS uint;
+Warnings:
+Warning	1292	Incorrect datetime value: '0000-00-00'
+Warning	1292	Incorrect datetime value: '0000-00-00'
+Warning	1292	Incorrect datetime value: '0000-00-00'
+Warning	1292	Incorrect datetime value: '0000-00-00'
+Warning	1292	Incorrect datetime value: '0000-00-00'
+Warning	1292	Incorrect datetime value: '0000-00-00'
+Warning	1292	Incorrect datetime value: '0000-00-00'
+Warning	1292	Incorrect datetime value: '0000-00-00'
+Warning	1292	Incorrect datetime value: '0000-00-00'
+SELECT * FROM t1;
+c0	string	date	datetime	time	dc	dbl	sint	uint
+NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `c0` date DEFAULT NULL,
+  `string` varchar(10) DEFAULT NULL,
+  `date` date DEFAULT NULL,
+  `datetime` datetime DEFAULT NULL,
+  `time` time DEFAULT NULL,
+  `dc` decimal(10,0) DEFAULT NULL,
+  `dbl` double DEFAULT NULL,
+  `sint` bigint(10) DEFAULT NULL,
+  `uint` bigint(20) unsigned DEFAULT NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+SET sql_mode=DEFAULT;
+#
+# MDEV-17330 Wrong result for 0 + LEAST(TIME'-10:00:00',TIME'10:00:00')
+#
+SELECT 0 + LEAST(TIME'-10:00:00',TIME'10:00:00') AS c;
+c
+-100000
+#
 # End of 10.4 tests
 #

mysql-test/main/func_hybrid_type.test

@@ -682,6 +682,40 @@ SHOW CREATE TABLE t1;
 DROP TABLE t1;
 SET sql_mode=DEFAULT;
 
+--echo #
+--echo # MDEV-17318 CAST(LEAST(zero_date,non_zero_date) AS numeric_data_type) returns a wrong result
+--echo #
+SET sql_mode='NO_ZERO_DATE,NO_ZERO_IN_DATE';
+SELECT
+  LEAST('0000-00-00',DATE'2001-01-01') AS c0,
+  CAST(LEAST('0000-00-00',DATE'2001-01-01') AS CHAR) AS string,
+  CAST(LEAST('0000-00-00',DATE'2001-01-01') AS DATE) AS date,
+  CAST(LEAST('0000-00-00',DATE'2001-01-01') AS DATETIME) AS datetime,
+  CAST(LEAST('0000-00-00',DATE'2001-01-01') AS TIME) AS time,
+  CAST(LEAST('0000-00-00',DATE'2001-01-01') AS DECIMAL) AS dc,
+  CAST(LEAST('0000-00-00',DATE'2001-01-01') AS DOUBLE) AS dbl,
+  CAST(LEAST('0000-00-00',DATE'2001-01-01') AS SIGNED) AS sint,
+  CAST(LEAST('0000-00-00',DATE'2001-01-01') AS UNSIGNED) AS uint;
+CREATE TABLE t1 AS SELECT
+  LEAST('0000-00-00',DATE'2001-01-01') AS c0,
+  CAST(LEAST('0000-00-00',DATE'2001-01-01') AS CHAR) AS string,
+  CAST(LEAST('0000-00-00',DATE'2001-01-01') AS DATE) AS date,
+  CAST(LEAST('0000-00-00',DATE'2001-01-01') AS DATETIME) AS datetime,
+  CAST(LEAST('0000-00-00',DATE'2001-01-01') AS TIME) AS time,
+  CAST(LEAST('0000-00-00',DATE'2001-01-01') AS DECIMAL) AS dc,
+  CAST(LEAST('0000-00-00',DATE'2001-01-01') AS DOUBLE) AS dbl,
+  CAST(LEAST('0000-00-00',DATE'2001-01-01') AS SIGNED) AS sint,
+  CAST(LEAST('0000-00-00',DATE'2001-01-01') AS UNSIGNED) AS uint;
+SELECT * FROM t1;
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+SET sql_mode=DEFAULT;
+
+--echo #
+--echo # MDEV-17330 Wrong result for 0 + LEAST(TIME'-10:00:00',TIME'10:00:00')
+--echo #
+SELECT 0 + LEAST(TIME'-10:00:00',TIME'10:00:00') AS c;
+
 
 --echo #
 --echo # End of 10.4 tests

sql/sql_type.cc

@@ -4639,13 +4639,30 @@ double Type_handler_string_result::
 }
 
 
-double Type_handler_temporal_result::
+double Type_handler_time_common::
          Item_func_min_max_val_real(Item_func_min_max *func) const
 {
-  MYSQL_TIME ltime;
+  return Time(current_thd, func).to_double();
-  if (func->get_date(current_thd, &ltime, date_mode_t(0)))
+}
-    return 0;
+
-  return TIME_to_double(&ltime);
+
+double Type_handler_date_common::
+         Item_func_min_max_val_real(Item_func_min_max *func) const
+{
+  return Date(current_thd, func).to_double();
+}
+
+
+double Type_handler_datetime_common::
+         Item_func_min_max_val_real(Item_func_min_max *func) const
+{
+  return Datetime(current_thd, func).to_double();
+}
+
+double Type_handler_timestamp_common::
+         Item_func_min_max_val_real(Item_func_min_max *func) const
+{
+  return Datetime(current_thd, func).to_double();
 }
 
 
@@ -4663,13 +4680,31 @@ longlong Type_handler_string_result::
 }
 
 
-longlong Type_handler_temporal_result::
+longlong Type_handler_time_common::
          Item_func_min_max_val_int(Item_func_min_max *func) const
 {
-  MYSQL_TIME ltime;
+  return Time(current_thd, func).to_longlong();
-  if (func->get_date(current_thd, &ltime, date_mode_t(0)))
+}
-    return 0;
+
-  return TIME_to_ulonglong(&ltime);
+
+longlong Type_handler_date_common::
+         Item_func_min_max_val_int(Item_func_min_max *func) const
+{
+  return Date(current_thd, func).to_longlong();
+}
+
+
+longlong Type_handler_datetime_common::
+         Item_func_min_max_val_int(Item_func_min_max *func) const
+{
+  return Datetime(current_thd, func).to_longlong();
+}
+
+
+longlong Type_handler_timestamp_common::
+         Item_func_min_max_val_int(Item_func_min_max *func) const
+{
+  return Datetime(current_thd, func).to_longlong();
 }
 
 
@@ -4696,14 +4731,35 @@ my_decimal *Type_handler_numeric::
 }
 
 
-my_decimal *Type_handler_temporal_result::
+my_decimal *Type_handler_time_common::
             Item_func_min_max_val_decimal(Item_func_min_max *func,
                                           my_decimal *dec) const
 {
-  MYSQL_TIME ltime;
+  return Time(current_thd, func).to_decimal(dec);
-  if (func->get_date(current_thd, &ltime, date_mode_t(0)))
+}
-    return 0;
+
-  return date2my_decimal(&ltime, dec);
+
+my_decimal *Type_handler_date_common::
+            Item_func_min_max_val_decimal(Item_func_min_max *func,
+                                          my_decimal *dec) const
+{
+  return Date(current_thd, func).to_decimal(dec);
+}
+
+
+my_decimal *Type_handler_datetime_common::
+            Item_func_min_max_val_decimal(Item_func_min_max *func,
+                                          my_decimal *dec) const
+{
+  return Datetime(current_thd, func).to_decimal(dec);
+}
+
+
+my_decimal *Type_handler_timestamp_common::
+            Item_func_min_max_val_decimal(Item_func_min_max *func,
+                                          my_decimal *dec) const
+{
+  return Datetime(current_thd, func).to_decimal(dec);
 }
 
 
@@ -4733,7 +4789,19 @@ bool Type_handler_temporal_result::
        Item_func_min_max_get_date(THD *thd, Item_func_min_max *func,
                                   MYSQL_TIME *ltime, date_mode_t fuzzydate) const
 {
-  return func->get_date_native(thd, ltime, fuzzydate);
+  /*
+    - If the caller specified TIME_TIME_ONLY, then it's going to convert
+      a DATETIME or DATE to TIME. So we pass the default flags for date. This is
+      exactly the same with what Item_func_min_max_val_{int|real|decimal|str} or
+      Item_send_datetime() do. We return the value in accordance with the
+      current session date flags and let the caller further convert it to TIME.
+    - If the caller did not specify TIME_TIME_ONLY, then return the value
+      according to the flags supplied by the caller.
+  */
+  return func->get_date_native(thd, ltime,
+                               fuzzydate & TIME_TIME_ONLY ?
+                               sql_mode_for_dates(thd) :
+                               fuzzydate);
 }
 
 bool Type_handler_time_common::

sql/sql_type.h

@@ -3308,10 +3308,6 @@ public:
                                             Item_func_hybrid_field_type *,
                                             MYSQL_TIME *,
                                             date_mode_t fuzzydate) const;
-  double Item_func_min_max_val_real(Item_func_min_max *) const;
-  longlong Item_func_min_max_val_int(Item_func_min_max *) const;
-  my_decimal *Item_func_min_max_val_decimal(Item_func_min_max *,
-                                            my_decimal *) const;
   bool Item_func_min_max_get_date(THD *thd, Item_func_min_max*,
                                   MYSQL_TIME *, date_mode_t fuzzydate) const;
   bool Item_func_between_fix_length_and_dec(Item_func_between *func) const;
@@ -3939,6 +3935,10 @@ public:
                                             MYSQL_TIME *,
                                             date_mode_t fuzzydate) const;
   String *Item_func_min_max_val_str(Item_func_min_max *, String *) const;
+  double Item_func_min_max_val_real(Item_func_min_max *) const;
+  longlong Item_func_min_max_val_int(Item_func_min_max *) const;
+  my_decimal *Item_func_min_max_val_decimal(Item_func_min_max *,
+                                            my_decimal *) const;
   bool Item_func_min_max_get_date(THD *thd, Item_func_min_max*,
                                   MYSQL_TIME *, date_mode_t fuzzydate) const;
   longlong Item_func_between_val_int(Item_func_between *func) const;
@@ -4056,6 +4056,10 @@ public:
   String *print_item_value(THD *thd, Item *item, String *str) const;
   Item_cache *Item_get_cache(THD *thd, const Item *item) const;
   String *Item_func_min_max_val_str(Item_func_min_max *, String *) const;
+  double Item_func_min_max_val_real(Item_func_min_max *) const;
+  longlong Item_func_min_max_val_int(Item_func_min_max *) const;
+  my_decimal *Item_func_min_max_val_decimal(Item_func_min_max *,
+                                            my_decimal *) const;
   bool Item_hybrid_func_fix_attributes(THD *thd,
                                        const char *name,
                                        Type_handler_hybrid_field_type *,
@@ -4152,6 +4156,10 @@ public:
   String *print_item_value(THD *thd, Item *item, String *str) const;
   Item_cache *Item_get_cache(THD *thd, const Item *item) const;
   String *Item_func_min_max_val_str(Item_func_min_max *, String *) const;
+  double Item_func_min_max_val_real(Item_func_min_max *) const;
+  longlong Item_func_min_max_val_int(Item_func_min_max *) const;
+  my_decimal *Item_func_min_max_val_decimal(Item_func_min_max *,
+                                            my_decimal *) const;
   bool Item_hybrid_func_fix_attributes(THD *thd,
                                        const char *name,
                                        Type_handler_hybrid_field_type *,
@@ -4252,6 +4260,10 @@ public:
   String *print_item_value(THD *thd, Item *item, String *str) const;
   Item_cache *Item_get_cache(THD *thd, const Item *item) const;
   String *Item_func_min_max_val_str(Item_func_min_max *, String *) const;
+  double Item_func_min_max_val_real(Item_func_min_max *) const;
+  longlong Item_func_min_max_val_int(Item_func_min_max *) const;
+  my_decimal *Item_func_min_max_val_decimal(Item_func_min_max *,
+                                            my_decimal *) const;
   bool Item_hybrid_func_fix_attributes(THD *thd,
                                        const char *name,
                                        Type_handler_hybrid_field_type *,