MDEV-11337 Split Item::save_in_field() into virtual methods in Type_handler

Also fixes:
MDEV-11331 Wrong result for INSERT INTO t1 (datetime_field) VALUES (hybrid_function_of_TIME_data_type)
MDEV-11333 Expect "Impossible where condition" for WHERE timestamp_field>=DATE_ADD(TIMESTAMP'9999-01-01 00:00:00',INTERVAL 1000 YEAR)

This patch does the following:
1. Splits the function Item::save_in_field() into pieces:
- Item::save_str_in_field()
- Item::save_real_in_field()
- Item::save_decimal_in_field()
- Item::save_int_in_field()

2. Adds the missing "no_conversion" parameters to
   Item::save_time_in_field() and Item::save_date_in_field(),
   so this parameter is now correctly passed to
   set_field_to_null_with_conversions().
   This fixes the problem reported in 11333.

3. Introduces a new virtual method Type_handler::Item_save_in_field()
   and uses the methods Item::save_xxx_in_field() from the implementations
   of Type_handler_xxx::Item_save_in_field().

These changes additionally fix the problem reported in MDEV-11331,
as the old code erroneously handled expressions like
COALESE(datetime-expression) through the STRING_RESULT branch of
Item::save_in_field() and therefore they looked like string type expressions
for the target fields. Now such expressions are correctly handled by
Item::save_date_in_field().

mysql-test/r/default.result

@@ -991,14 +991,9 @@ t1	CREATE TABLE `t1` (
   `a` decimal(30,6) DEFAULT coalesce(current_timestamp(6))
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 INSERT INTO t1 VALUES();
-Warnings:
-Warning	1265	Data truncated for column 'a' at row 1
 INSERT IGNORE INTO t1 VALUES();
-Warnings:
-Warning	1265	Data truncated for column 'a' at row 1
 SET sql_mode = 'STRICT_ALL_TABLES';
 INSERT INTO t1 VALUES();
-ERROR 01000: Data truncated for column 'a' at row 1
 SET sql_mode = DEFAULT;
 DROP TABLE t1;
 #
@@ -1011,8 +1006,6 @@ t1	CREATE TABLE `t1` (
   `a` decimal(30,6) DEFAULT coalesce(curtime(6))
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 INSERT INTO t1 VALUES();
-Warnings:
-Warning	1265	Data truncated for column 'a' at row 1
 DROP TABLE t1;
 #
 # DECIMAL + CURRENT_DATE, no truncation
@@ -1024,8 +1017,6 @@ t1	CREATE TABLE `t1` (
   `a` decimal(30,6) DEFAULT coalesce(curdate())
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 INSERT INTO t1 VALUES();
-Warnings:
-Warning	1265	Data truncated for column 'a' at row 1
 DROP TABLE t1;
 #
 # COALESCE for SQL Standard <datetime value function>
@@ -1082,10 +1073,10 @@ t1	CREATE TABLE `t1` (
 INSERT INTO t1 VALUES ();
 Warnings:
 Note	1265	Data truncated for column 'a' at row 1
-Warning	1265	Data truncated for column 'b' at row 1
+Note	1265	Data truncated for column 'b' at row 1
 SELECT * FROM t1;
 a	b
-20010101102030	2001
+20010101102030	20010101102030
 DROP TABLE t1;
 #
 # Check DEFAULT() function

mysql-test/r/type_datetime.result

@@ -1199,3 +1199,24 @@ DROP TABLE t1;
 #
 # End of 10.2 tests
 #
+#
+# Start of 10.3 tests
+#
+#
+# MDEV-11331 Wrong result for INSERT INTO t1 (datetime_field) VALUES (hybrid_function_of_TIME_data_type)
+#
+SET timestamp=UNIX_TIMESTAMP('2001-02-03 10:00:00');
+CREATE TABLE t1 (a DATETIME);
+INSERT INTO t1 VALUES (TIME'10:20:30');
+INSERT INTO t1 VALUES (COALESCE(TIME'10:20:30'));
+INSERT INTO t1 VALUES (LEAST(TIME'10:20:30',TIME'10:20:30'));
+SELECT * FROM t1;
+a
+2001-02-03 10:20:30
+2001-02-03 10:20:30
+2001-02-03 10:20:30
+DROP TABLE t1;
+SET timestamp=DEFAULT;
+#
+# End of 10.3 tests
+#

mysql-test/r/type_timestamp.result

@@ -950,3 +950,35 @@ DROP TABLE t1;
 #
 # End of 10.1 tests
 #
+#
+# Start of 10.3 tests
+#
+#
+# MDEV-11333     MDEV-11333 Expect "Impossible where condition" for WHERE timestamp_field>=DATE_ADD(TIMESTAMP'9999-01-01 00:00:00',INTERVAL 1000 YEAR)
+#
+SELECT DATE_ADD(TIMESTAMP'9999-01-01 00:00:00',INTERVAL 1000 YEAR);
+DATE_ADD(TIMESTAMP'9999-01-01 00:00:00',INTERVAL 1000 YEAR)
+NULL
+Warnings:
+Warning	1441	Datetime function: datetime field overflow
+CREATE TABLE t1 (a TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP, KEY(a)) ENGINE=MyISAM;
+INSERT INTO t1 VALUES('2001-01-01'),('2002-02-02'),('2003-03-03');
+INSERT INTO t1 VALUES('2001-01-01'),('2002-02-02'),('2003-03-03');
+INSERT INTO t1 VALUES('2001-01-01'),('2002-02-02'),('2003-03-03');
+INSERT INTO t1 VALUES('2001-01-01'),('2002-02-02'),('2003-03-03');
+INSERT INTO t1 VALUES('2001-01-01'),('2002-02-02'),('2003-03-03');
+INSERT INTO t1 VALUES('2001-01-01'),('2002-02-02'),('2003-03-03');
+EXPLAIN SELECT * FROM t1 WHERE a >= DATE_ADD(TIMESTAMP'9999-01-01 00:00:00',INTERVAL 1000 YEAR);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+Warnings:
+Warning	1441	Datetime function: datetime field overflow
+EXPLAIN SELECT * FROM t1 WHERE a >= COALESCE(DATE_ADD(TIMESTAMP'9999-01-01 00:00:00',INTERVAL 1000 YEAR));
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
+Warnings:
+Warning	1441	Datetime function: datetime field overflow
+DROP TABLE t1;
+#
+# End of 10.3 tests
+#

mysql-test/t/default.test

@@ -756,11 +756,9 @@ DROP TABLE t1;
 
 CREATE TABLE t1 (a DECIMAL(30,6) DEFAULT COALESCE(CURRENT_TIMESTAMP(6)));
 SHOW CREATE TABLE t1;
-# Same as insert into t1 values ("2016-06-05 12:54:52.342095");
 INSERT INTO t1 VALUES();
 INSERT IGNORE INTO t1 VALUES();
 SET sql_mode = 'STRICT_ALL_TABLES';
---error WARN_DATA_TRUNCATED
 INSERT INTO t1 VALUES();
 SET sql_mode = DEFAULT;
 DROP TABLE t1;

mysql-test/t/type_datetime.test

@@ -751,3 +751,24 @@ DROP TABLE t1;
 --echo #
 --echo # End of 10.2 tests
 --echo #
+
+--echo #
+--echo # Start of 10.3 tests
+--echo #
+
+--echo #
+--echo # MDEV-11331 Wrong result for INSERT INTO t1 (datetime_field) VALUES (hybrid_function_of_TIME_data_type)
+--echo #
+SET timestamp=UNIX_TIMESTAMP('2001-02-03 10:00:00');
+CREATE TABLE t1 (a DATETIME);
+INSERT INTO t1 VALUES (TIME'10:20:30');
+INSERT INTO t1 VALUES (COALESCE(TIME'10:20:30'));
+INSERT INTO t1 VALUES (LEAST(TIME'10:20:30',TIME'10:20:30'));
+SELECT * FROM t1;
+DROP TABLE t1;
+SET timestamp=DEFAULT;
+
+
+--echo #
+--echo # End of 10.3 tests
+--echo #

mysql-test/t/type_timestamp.test

@@ -555,3 +555,27 @@ let defval='0000-00-00 00:00:00';
 --echo #
 --echo # End of 10.1 tests
 --echo #
+
+--echo #
+--echo # Start of 10.3 tests
+--echo #
+
+--echo #
+--echo # MDEV-11333     MDEV-11333 Expect "Impossible where condition" for WHERE timestamp_field>=DATE_ADD(TIMESTAMP'9999-01-01 00:00:00',INTERVAL 1000 YEAR)
+--echo #
+
+SELECT DATE_ADD(TIMESTAMP'9999-01-01 00:00:00',INTERVAL 1000 YEAR);
+CREATE TABLE t1 (a TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP, KEY(a)) ENGINE=MyISAM;
+INSERT INTO t1 VALUES('2001-01-01'),('2002-02-02'),('2003-03-03');
+INSERT INTO t1 VALUES('2001-01-01'),('2002-02-02'),('2003-03-03');
+INSERT INTO t1 VALUES('2001-01-01'),('2002-02-02'),('2003-03-03');
+INSERT INTO t1 VALUES('2001-01-01'),('2002-02-02'),('2003-03-03');
+INSERT INTO t1 VALUES('2001-01-01'),('2002-02-02'),('2003-03-03');
+INSERT INTO t1 VALUES('2001-01-01'),('2002-02-02'),('2003-03-03');
+EXPLAIN SELECT * FROM t1 WHERE a >= DATE_ADD(TIMESTAMP'9999-01-01 00:00:00',INTERVAL 1000 YEAR);
+EXPLAIN SELECT * FROM t1 WHERE a >= COALESCE(DATE_ADD(TIMESTAMP'9999-01-01 00:00:00',INTERVAL 1000 YEAR));
+DROP TABLE t1;
+
+--echo #
+--echo # End of 10.3 tests
+--echo #

sql/item.cc

@@ -419,21 +419,21 @@ longlong Item::val_int_from_decimal()
   return result;
 }
 
-int Item::save_time_in_field(Field *field)
+int Item::save_time_in_field(Field *field, bool no_conversions)
 {
   MYSQL_TIME ltime;
   if (get_time(&ltime))
-    return set_field_to_null_with_conversions(field, 0);
+    return set_field_to_null_with_conversions(field, no_conversions);
   field->set_notnull();
   return field->store_time_dec(&ltime, decimals);
 }
 
 
-int Item::save_date_in_field(Field *field)
+int Item::save_date_in_field(Field *field, bool no_conversions)
 {
   MYSQL_TIME ltime;
   if (get_date(&ltime, sql_mode_for_dates(field->table->in_use)))
-    return set_field_to_null_with_conversions(field, 0);
+    return set_field_to_null_with_conversions(field, no_conversions);
   field->set_notnull();
   return field->store_time_dec(&ltime, decimals);
 }
@@ -6265,12 +6265,8 @@ int Item_null::save_safe_in_field(Field *field)
   Note: all Item_XXX::val_str(str) methods must NOT assume that
   str != str_value. For example, see fix for bug #44743.
 */
-
-int Item::save_in_field(Field *field, bool no_conversions)
+int Item::save_str_in_field(Field *field, bool no_conversions)
 {
-  int error;
-  if (result_type() == STRING_RESULT)
-  {
   String *result;
   CHARSET_INFO *cs= collation.collation;
   char buff[MAX_FIELD_WIDTH];		// Alloc buffer for small columns
@@ -6285,34 +6281,46 @@ int Item::save_in_field(Field *field, bool no_conversions)
   /* NOTE: If null_value == FALSE, "result" must be not NULL.  */
 
   field->set_notnull();
-    error=field->store(result->ptr(),result->length(),cs);
+  int error= field->store(result->ptr(),result->length(),cs);
   str_value.set_quick(0, 0, cs);
-  }
-  else if (result_type() == REAL_RESULT)
-  {
+  return error;
+}
+
+
+int Item::save_real_in_field(Field *field, bool no_conversions)
+{
   double nr= val_real();
   if (null_value)
     return set_field_to_null_with_conversions(field, no_conversions);
   field->set_notnull();
-    error=field->store(nr);
-  }
-  else if (result_type() == DECIMAL_RESULT)
-  {
+  return field->store(nr);
+}
+
+
+int Item::save_decimal_in_field(Field *field, bool no_conversions)
+{
   my_decimal decimal_value;
   my_decimal *value= val_decimal(&decimal_value);
   if (null_value)
     return set_field_to_null_with_conversions(field, no_conversions);
   field->set_notnull();
-    error=field->store_decimal(value);
-  }
-  else
-  {
-    longlong nr=val_int();
+  return field->store_decimal(value);
+}
+
+
+int Item::save_int_in_field(Field *field, bool no_conversions)
+{
+  longlong nr= val_int();
   if (null_value)
     return set_field_to_null_with_conversions(field, no_conversions);
   field->set_notnull();
-    error=field->store(nr, unsigned_flag);
-  }
+  return field->store(nr, unsigned_flag);
+}
+
+
+int Item::save_in_field(Field *field, bool no_conversions)
+{
+  int error= type_handler()->Item_save_in_field(this, field, no_conversions);
   return error ? error : (field->table->in_use->is_error() ? 1 : 0);
 }
 

sql/item.h

@@ -991,8 +991,13 @@ class Item: public Value_source,
   // Check NULL value for a TIME, DATE or DATETIME expression
   bool is_null_from_temporal();
 
-  int save_time_in_field(Field *field);
-  int save_date_in_field(Field *field);
+  int save_time_in_field(Field *field, bool no_conversions);
+  int save_date_in_field(Field *field, bool no_conversions);
+  int save_str_in_field(Field *field, bool no_conversions);
+  int save_real_in_field(Field *field, bool no_conversions);
+  int save_int_in_field(Field *field, bool no_conversions);
+  int save_decimal_in_field(Field *field, bool no_conversions);
+
   int save_str_value_in_field(Field *field, String *result);
 
   virtual Field *get_tmp_table_field() { return 0; }
@@ -3459,7 +3464,7 @@ class Item_temporal_literal :public Item_basic_constant
   my_decimal *val_decimal(my_decimal *decimal_value)
   { return  val_decimal_from_date(decimal_value); }
   int save_in_field(Field *field, bool no_conversions)
-  { return save_date_in_field(field); }
+  { return save_date_in_field(field, no_conversions); }
 };
 
 

sql/item_timefunc.h

@@ -548,7 +548,7 @@ class Item_temporal_func: public Item_func
   Field *create_field_for_create_select(TABLE *table)
   { return tmp_table_field_from_field_type(table, false, false); }
   int save_in_field(Field *field, bool no_conversions)
-  { return save_date_in_field(field); }
+  { return save_date_in_field(field, no_conversions); }
   void fix_length_and_dec();
 };
 

sql/sql_type.cc

@@ -640,3 +640,47 @@ Field *Type_handler_set::make_conversion_table_field(TABLE *table,
                    metadata & 0x00ff/*pack_length()*/,
                    ((const Field_enum*) target)->typelib, target->charset());
 }
+
+/*************************************************************************/
+
+int Type_handler_time_common::Item_save_in_field(Item *item, Field *field,
+                                                 bool no_conversions) const
+{
+  return item->save_time_in_field(field, no_conversions);
+}
+
+int Type_handler_temporal_with_date::Item_save_in_field(Item *item,
+                                                        Field *field,
+                                                        bool no_conversions)
+                                                        const
+{
+  return item->save_date_in_field(field, no_conversions);
+}
+
+
+int Type_handler_string_result::Item_save_in_field(Item *item, Field *field,
+                                                   bool no_conversions) const
+{
+  return item->save_str_in_field(field, no_conversions);
+}
+
+
+int Type_handler_real_result::Item_save_in_field(Item *item, Field *field,
+                                                 bool no_conversions) const
+{
+  return item->save_real_in_field(field, no_conversions);
+}
+
+
+int Type_handler_decimal_result::Item_save_in_field(Item *item, Field *field,
+                                                    bool no_conversions) const
+{
+  return item->save_decimal_in_field(field, no_conversions);
+}
+
+
+int Type_handler_int_result::Item_save_in_field(Item *item, Field *field,
+                                                bool no_conversions) const
+{
+  return item->save_int_in_field(field, no_conversions);
+}

sql/sql_type.h

@@ -272,6 +272,9 @@ class Type_handler
   virtual void sortlength(THD *thd,
                           const Type_std_attributes *item,
                           SORT_FIELD_ATTR *attr) const= 0;
+
+  virtual int Item_save_in_field(Item *item, Field *field,
+                                 bool no_conversions) const= 0;
 };
 
 
@@ -288,6 +291,7 @@ class Type_handler_real_result: public Type_handler
   void sortlength(THD *thd,
                   const Type_std_attributes *item,
                   SORT_FIELD_ATTR *attr) const;
+  int Item_save_in_field(Item *item, Field *field, bool no_conversions) const;
 };
 
 
@@ -303,6 +307,7 @@ class Type_handler_decimal_result: public Type_handler
   void sortlength(THD *thd,
                   const Type_std_attributes *item,
                   SORT_FIELD_ATTR *attr) const;
+  int Item_save_in_field(Item *item, Field *field, bool no_conversions) const;
 };
 
 
@@ -318,6 +323,7 @@ class Type_handler_int_result: public Type_handler
   void sortlength(THD *thd,
                   const Type_std_attributes *item,
                   SORT_FIELD_ATTR *attr) const;
+  int Item_save_in_field(Item *item, Field *field, bool no_conversions) const;
 };
 
 
@@ -349,6 +355,7 @@ class Type_handler_string_result: public Type_handler
   void sortlength(THD *thd,
                   const Type_std_attributes *item,
                   SORT_FIELD_ATTR *attr) const;
+  int Item_save_in_field(Item *item, Field *field, bool no_conversions) const;
 };
 
 
@@ -463,28 +470,43 @@ class Type_handler_double: public Type_handler_real_result
 };
 
 
-class Type_handler_time: public Type_handler_temporal_result
+class Type_handler_time_common: public Type_handler_temporal_result
 {
 public:
-  virtual ~Type_handler_time() {}
+  virtual ~Type_handler_time_common() { }
   enum_field_types field_type() const { return MYSQL_TYPE_TIME; }
+  int Item_save_in_field(Item *item, Field *field, bool no_conversions) const;
+};
+
+
+class Type_handler_time: public Type_handler_time_common
+{
+public:
+  virtual ~Type_handler_time() {}
   Field *make_conversion_table_field(TABLE *, uint metadata,
                                      const Field *target) const;
 };
 
 
-class Type_handler_time2: public Type_handler_temporal_result
+class Type_handler_time2: public Type_handler_time_common
 {
 public:
   virtual ~Type_handler_time2() {}
-  enum_field_types field_type() const { return MYSQL_TYPE_TIME; }
   enum_field_types real_field_type() const { return MYSQL_TYPE_TIME2; }
   Field *make_conversion_table_field(TABLE *, uint metadata,
                                      const Field *target) const;
 };
 
 
-class Type_handler_date: public Type_handler_temporal_result
+class Type_handler_temporal_with_date: public Type_handler_temporal_result
+{
+public:
+  virtual ~Type_handler_temporal_with_date() {}
+  int Item_save_in_field(Item *item, Field *field, bool no_conversions) const;
+};
+
+
+class Type_handler_date: public Type_handler_temporal_with_date
 {
 public:
   virtual ~Type_handler_date() {}
@@ -494,7 +516,7 @@ class Type_handler_date: public Type_handler_temporal_result
 };
 
 
-class Type_handler_newdate: public Type_handler_temporal_result
+class Type_handler_newdate: public Type_handler_temporal_with_date
 {
 public:
   virtual ~Type_handler_newdate() {}
@@ -504,7 +526,7 @@ class Type_handler_newdate: public Type_handler_temporal_result
 };
 
 
-class Type_handler_datetime: public Type_handler_temporal_result
+class Type_handler_datetime: public Type_handler_temporal_with_date
 {
 public:
   virtual ~Type_handler_datetime() {}
@@ -514,7 +536,7 @@ class Type_handler_datetime: public Type_handler_temporal_result
 };
 
 
-class Type_handler_datetime2: public Type_handler_temporal_result
+class Type_handler_datetime2: public Type_handler_temporal_with_date
 {
 public:
   virtual ~Type_handler_datetime2() {}
@@ -525,7 +547,7 @@ class Type_handler_datetime2: public Type_handler_temporal_result
 };
 
 
-class Type_handler_timestamp: public Type_handler_temporal_result
+class Type_handler_timestamp: public Type_handler_temporal_with_date
 {
 public:
   virtual ~Type_handler_timestamp() {}
@@ -535,7 +557,7 @@ class Type_handler_timestamp: public Type_handler_temporal_result
 };
 
 
-class Type_handler_timestamp2: public Type_handler_temporal_result
+class Type_handler_timestamp2: public Type_handler_temporal_with_date
 {
 public:
   virtual ~Type_handler_timestamp2() {}