MDEV-12866 Out-of-range error with CREATE..SELECT..TO_SECONDS(NOW())

mysql-test/r/func_time.result

@@ -3282,3 +3282,15 @@ DROP TABLE t2;
 DROP VIEW v1;
 DROP TABLE t1;
 SET sql_mode=DEFAULT;
+#
+# MDEV-12866 Out-of-range error with CREATE..SELECT..TO_SECONDS(NOW())
+#
+SET sql_mode=STRICT_ALL_TABLES;
+CREATE TABLE t1 AS SELECT TO_SECONDS('9999-12-31 23:59:59');
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `TO_SECONDS('9999-12-31 23:59:59')` bigint(12) DEFAULT NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+SET sql_mode=DEFAULT;

mysql-test/r/metadata.result

@@ -476,7 +476,7 @@ def					PERIOD_DIFF(200802,200703)	3	6	2	N	32897	0	63
 def					TO_DAYS('2007-10-07')	3	6	6	Y	32896	0	63
 def					DAYOFMONTH('2007-02-03')	3	2	1	Y	32896	0	63
 def					DAYOFWEEK('2007-02-03')	3	1	1	Y	32896	0	63
-def					TO_SECONDS('2013-06-13')	3	6	11	Y	32896	0	63
+def					TO_SECONDS('2013-06-13')	8	12	11	Y	32896	0	63
 PERIOD_ADD(200801,2)	PERIOD_DIFF(200802,200703)	TO_DAYS('2007-10-07')	DAYOFMONTH('2007-02-03')	DAYOFWEEK('2007-02-03')	TO_SECONDS('2013-06-13')
 200803	11	733321	3	7	63538300800
 SELECT

mysql-test/r/partition_column.result

@@ -542,7 +542,7 @@ create table t1 as select to_seconds(null) as to_seconds;
 select data_type from information_schema.columns
 where table_schema='test' and column_name='to_seconds';
 data_type
-int
+bigint
 drop table t1;
 create table t1 (a int, b int)
 partition by list columns(a,b)

mysql-test/t/func_time.test

@@ -1871,3 +1871,12 @@ DROP TABLE t2;
 DROP VIEW v1;
 DROP TABLE t1;
 SET sql_mode=DEFAULT;
+
+--echo #
+--echo # MDEV-12866 Out-of-range error with CREATE..SELECT..TO_SECONDS(NOW())
+--echo #
+SET sql_mode=STRICT_ALL_TABLES;
+CREATE TABLE t1 AS SELECT TO_SECONDS('9999-12-31 23:59:59');
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+SET sql_mode=DEFAULT;

sql/item_timefunc.h

@@ -89,16 +89,16 @@ class Item_func_to_days :public Item_long_func
 };
 
 
-class Item_func_to_seconds :public Item_long_func
+class Item_func_to_seconds :public Item_longlong_func
 {
 public:
-  Item_func_to_seconds(THD *thd, Item *a): Item_long_func(thd, a) {}
+  Item_func_to_seconds(THD *thd, Item *a): Item_longlong_func(thd, a) {}
   longlong val_int();
   const char *func_name() const { return "to_seconds"; }
   void fix_length_and_dec()
   { 
     decimals=0; 
-    max_length=6*MY_CHARSET_BIN_MB_MAXLEN;
+    fix_char_length(12);
     maybe_null= 1;
   }
   enum_monotonicity_info get_monotonicity_info() const;