Merge epotemkin@bk-internal.mysql.com:/home/bk/mysql-5.0-opt

into  sunlight.local:/local_work/27216-bug-5.0-opt-mysql

libmysql/libmysql.c

@@ -4355,6 +4355,7 @@ static my_bool setup_one_fetch_function(MYSQL_BIND *param, MYSQL_FIELD *field)
   case MYSQL_TYPE_STRING:
   case MYSQL_TYPE_DECIMAL:
   case MYSQL_TYPE_NEWDECIMAL:
+  case MYSQL_TYPE_NEWDATE:
     DBUG_ASSERT(param->buffer_length != 0);
     param->fetch_result= fetch_result_str;
     break;
@@ -4427,6 +4428,7 @@ static my_bool setup_one_fetch_function(MYSQL_BIND *param, MYSQL_FIELD *field)
   case MYSQL_TYPE_VAR_STRING:
   case MYSQL_TYPE_STRING:
   case MYSQL_TYPE_BIT:
+  case MYSQL_TYPE_NEWDATE:
     param->skip_result= skip_result_string;
     break;
   default:

mysql-test/r/date_formats.result

@@ -481,7 +481,7 @@ str_to_date(a,b)
 create table t2 select str_to_date(a,b) from t1;
 describe t2;
 Field	Type	Null	Key	Default	Extra
-str_to_date(a,b)	binary(29)	YES		NULL	
+str_to_date(a,b)	datetime	YES		NULL	
 select str_to_date("2003-01-02 10:11:12.0012", "%Y-%m-%d %H:%i:%S.%f") as f1,
 str_to_date("2003-01-02 10:11:12.0012", "%Y-%m-%d %H:%i:%S") as f2,
 str_to_date("2003-01-02", "%Y-%m-%d") as f3,

mysql-test/r/type_datetime.result

@@ -427,3 +427,64 @@ f1
 Warnings:
 Warning	1292	Incorrect datetime value: '2007010100000' for column 'f1' at row 1
 drop table t1;
+#
+# Bug#27216: functions with parameters of different date types may
+#            return wrong type of the result.
+#
+create table t1 (f1 date, f2 datetime, f3 varchar(20));
+create table t2 as select coalesce(f1,f1) as f4 from t1;
+desc t2;
+Field	Type	Null	Key	Default	Extra
+f4	date	YES		NULL	
+create table t3 as select coalesce(f1,f2) as f4 from t1;
+desc t3;
+Field	Type	Null	Key	Default	Extra
+f4	datetime	YES		NULL	
+create table t4 as select coalesce(f2,f2) as f4 from t1;
+desc t4;
+Field	Type	Null	Key	Default	Extra
+f4	datetime	YES		NULL	
+create table t5 as select coalesce(f1,f3) as f4 from t1;
+desc t5;
+Field	Type	Null	Key	Default	Extra
+f4	varbinary(20)	YES		NULL	
+create table t6 as select coalesce(f2,f3) as f4 from t1;
+desc t6;
+Field	Type	Null	Key	Default	Extra
+f4	varbinary(20)	YES		NULL	
+create table t7 as select coalesce(makedate(1997,1),f2) as f4 from t1;
+desc t7;
+Field	Type	Null	Key	Default	Extra
+f4	datetime	YES		NULL	
+create table t8 as select coalesce(cast('01-01-01' as datetime),f2) as f4
+from t1;
+desc t8;
+Field	Type	Null	Key	Default	Extra
+f4	datetime	YES		NULL	
+create table t9 as select case when 1 then cast('01-01-01' as date)
+when 0 then cast('01-01-01' as date) end as f4 from t1;
+desc t9;
+Field	Type	Null	Key	Default	Extra
+f4	date	YES		NULL	
+create table t10 as select case when 1 then cast('01-01-01' as datetime)
+when 0 then cast('01-01-01' as datetime) end as f4 from t1;
+desc t10;
+Field	Type	Null	Key	Default	Extra
+f4	datetime	YES		NULL	
+create table t11 as select if(1, cast('01-01-01' as datetime),
+cast('01-01-01' as date)) as f4 from t1;
+desc t11;
+Field	Type	Null	Key	Default	Extra
+f4	datetime	YES		NULL	
+create table t12 as select least(cast('01-01-01' as datetime),
+cast('01-01-01' as date)) as f4 from t1;
+desc t12;
+Field	Type	Null	Key	Default	Extra
+f4	datetime	YES		NULL	
+create table t13 as select ifnull(cast('01-01-01' as datetime),
+cast('01-01-01' as date)) as f4 from t1;
+desc t13;
+Field	Type	Null	Key	Default	Extra
+f4	datetime	YES		NULL	
+drop tables t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11,t12,t13;
+###################################################################

mysql-test/t/type_datetime.test

@@ -282,3 +282,41 @@ select * from t1 where f1 between 20020101 and 20070101000000;
 select * from t1 where f1 between 2002010 and 20070101000000;
 select * from t1 where f1 between 20020101 and 2007010100000;
 drop table t1;
+
+--echo #
+--echo # Bug#27216: functions with parameters of different date types may
+--echo #            return wrong type of the result.
+--echo #
+create table t1 (f1 date, f2 datetime, f3 varchar(20));
+create table t2 as select coalesce(f1,f1) as f4 from t1;
+desc t2;
+create table t3 as select coalesce(f1,f2) as f4 from t1;
+desc t3;
+create table t4 as select coalesce(f2,f2) as f4 from t1;
+desc t4;
+create table t5 as select coalesce(f1,f3) as f4 from t1;
+desc t5;
+create table t6 as select coalesce(f2,f3) as f4 from t1;
+desc t6;
+create table t7 as select coalesce(makedate(1997,1),f2) as f4 from t1;
+desc t7;
+create table t8 as select coalesce(cast('01-01-01' as datetime),f2) as f4
+  from t1;
+desc t8;
+create table t9 as select case when 1 then cast('01-01-01' as date)
+  when 0 then cast('01-01-01' as date) end as f4 from t1;
+desc t9;
+create table t10 as select case when 1 then cast('01-01-01' as datetime)
+  when 0 then cast('01-01-01' as datetime) end as f4 from t1;
+desc t10;
+create table t11 as select if(1, cast('01-01-01' as datetime),
+  cast('01-01-01' as date)) as f4 from t1;
+desc t11;
+create table t12 as select least(cast('01-01-01' as datetime),
+  cast('01-01-01' as date)) as f4 from t1;
+desc t12;
+create table t13 as select ifnull(cast('01-01-01' as datetime),
+  cast('01-01-01' as date)) as f4 from t1;
+desc t13;
+drop tables t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11,t12,t13;
+--echo ###################################################################

sql/item_cmpfunc.cc

@@ -147,6 +147,36 @@ static int agg_cmp_type(THD *thd, Item_result *type, Item **items, uint nitems)
 }
 
 
+/**
+  @brief Aggregates field types from the array of items.
+
+  @param[in] items  array of items to aggregate the type from
+  @paran[in] nitems number of items in the array
+
+  @details This function aggregates field types from the array of items.
+    Found type is supposed to be used later as the result field type
+    of a multi-argument function.
+    Aggregation itself is performed by the Field::field_type_merge()
+    function.
+
+  @note The term "aggregation" is used here in the sense of inferring the
+    result type of a function from its argument types.
+
+  @return aggregated field type.
+*/
+
+enum_field_types agg_field_type(Item **items, uint nitems)
+{
+  uint i;
+  if (!nitems || items[0]->result_type() == ROW_RESULT )
+    return (enum_field_types)-1;
+  enum_field_types res= items[0]->field_type();
+  for (i= 1 ; i < nitems ; i++)
+    res= Field::field_type_merge(res, items[i]->field_type());
+  return res;
+}
+
+
 static void my_coll_agg_error(DTCollation &c1, DTCollation &c2,
                               const char *fname)
 {
@@ -2009,9 +2039,7 @@ Item_func_ifnull::fix_length_and_dec()
   default:
     DBUG_ASSERT(0);
   }
-  cached_field_type= args[0]->field_type();
-  if (cached_field_type != args[1]->field_type())
-    cached_field_type= Item_func::field_type();
+  cached_field_type= agg_field_type(args, 2);
 }
 
 
@@ -2159,11 +2187,13 @@ Item_func_if::fix_length_and_dec()
   {
     cached_result_type= arg2_type;
     collation.set(args[2]->collation.collation);
+    cached_field_type= args[2]->field_type();
   }
   else if (null2)
   {
     cached_result_type= arg1_type;
     collation.set(args[1]->collation.collation);
+    cached_field_type= args[1]->field_type();
   }
   else
   {
@@ -2177,6 +2207,7 @@ Item_func_if::fix_length_and_dec()
     {
       collation.set(&my_charset_bin);	// Number
     }
+    cached_field_type= agg_field_type(args + 1, 2);
   }
 
   if ((cached_result_type == DECIMAL_RESULT )
@@ -2556,7 +2587,7 @@ void Item_func_case::fix_length_and_dec()
       agg_arg_charsets(collation, agg, nagg, MY_COLL_ALLOW_CONV, 1))
     return;
   
-  
+  cached_field_type= agg_field_type(agg, nagg);
   /*
     Aggregate first expression and all THEN expression types
     and collations when string comparison
@@ -2695,6 +2726,7 @@ my_decimal *Item_func_coalesce::decimal_op(my_decimal *decimal_value)
 
 void Item_func_coalesce::fix_length_and_dec()
 {
+  cached_field_type= agg_field_type(args, arg_count);
   agg_result_type(&hybrid_type, args, arg_count);
   switch (hybrid_type) {
   case STRING_RESULT:

sql/item_cmpfunc.h

@@ -640,6 +640,7 @@ public:
 class Item_func_coalesce :public Item_func_numhybrid
 {
 protected:
+  enum_field_types cached_field_type;
   Item_func_coalesce(Item *a, Item *b) :Item_func_numhybrid(a, b) {}
 public:
   Item_func_coalesce(List<Item> &list) :Item_func_numhybrid(list) {}
@@ -652,13 +653,13 @@ public:
   enum Item_result result_type () const { return hybrid_type; }
   const char *func_name() const { return "coalesce"; }
   table_map not_null_tables() const { return 0; }
+  enum_field_types field_type() const { return cached_field_type; }
 };
 
 
 class Item_func_ifnull :public Item_func_coalesce
 {
 protected:
-  enum_field_types cached_field_type;
   bool field_type_defined;
 public:
   Item_func_ifnull(Item *a, Item *b) :Item_func_coalesce(a,b) {}
@@ -677,6 +678,7 @@ public:
 class Item_func_if :public Item_func
 {
   enum Item_result cached_result_type;
+  enum_field_types cached_field_type;
 public:
   Item_func_if(Item *a,Item *b,Item *c)
     :Item_func(a,b,c), cached_result_type(INT_RESULT)
@@ -686,6 +688,7 @@ public:
   String *val_str(String *str);
   my_decimal *val_decimal(my_decimal *);
   enum Item_result result_type () const { return cached_result_type; }
+  enum_field_types field_type() const { return cached_field_type; }
   bool fix_fields(THD *, Item **);
   void fix_length_and_dec();
   uint decimal_precision() const;
@@ -722,6 +725,7 @@ class Item_func_case :public Item_func
   uint ncases;
   Item_result cmp_type;
   DTCollation cmp_collation;
+  enum_field_types cached_field_type;
 public:
   Item_func_case(List<Item> &list, Item *first_expr_arg, Item *else_expr_arg)
     :Item_func(), first_expr_num(-1), else_expr_num(-1),
@@ -749,6 +753,7 @@ public:
   uint decimal_precision() const;
   table_map not_null_tables() const { return 0; }
   enum Item_result result_type () const { return cached_result_type; }
+  enum_field_types field_type() const { return cached_field_type; }
   const char *func_name() const { return "case"; }
   void print(String *str);
   Item *find_item(String *str);
@@ -1382,6 +1387,7 @@ public:
   bool subst_argument_checker(byte **arg) { return TRUE; }
   Item *compile(Item_analyzer analyzer, byte **arg_p,
                 Item_transformer transformer, byte *arg_t);
+  enum_field_types field_type() const { return MYSQL_TYPE_LONGLONG; }
 };
 
 

sql/item_func.cc

@@ -2243,6 +2243,7 @@ void Item_func_min_max::fix_length_and_dec()
   else if ((cmp_type == DECIMAL_RESULT) || (cmp_type == INT_RESULT))
     max_length= my_decimal_precision_to_length(max_int_part+decimals, decimals,
                                             unsigned_flag);
+  cached_field_type= agg_field_type(args, arg_count);
 }
 
 

sql/item_func.h

@@ -692,7 +692,8 @@ class Item_func_min_max :public Item_func
   /* An item used for issuing warnings while string to DATETIME conversion. */
   Item *datetime_item;
   THD *thd;
-
+protected:
+  enum_field_types cached_field_type;
 public:
   Item_func_min_max(List<Item> &list,int cmp_sign_arg) :Item_func(list),
     cmp_type(INT_RESULT), cmp_sign(cmp_sign_arg), compare_as_dates(FALSE),
@@ -705,6 +706,7 @@ public:
   enum Item_result result_type () const { return cmp_type; }
   bool result_as_longlong() { return compare_as_dates; };
   uint cmp_datetimes(ulonglong *value);
+  enum_field_types field_type() const { return cached_field_type; }
 };
 
 class Item_func_min :public Item_func_min_max

sql/item_timefunc.cc

@@ -3310,7 +3310,7 @@ void Item_func_str_to_date::fix_length_and_dec()
   String format_str(format_buff, sizeof(format_buff), &my_charset_bin), *format;
   maybe_null= 1;
   decimals=0;
-  cached_field_type= MYSQL_TYPE_STRING;
+  cached_field_type= MYSQL_TYPE_DATETIME;
   max_length= MAX_DATETIME_FULL_WIDTH*MY_CHARSET_BIN_MB_MAXLEN;
   cached_timestamp_type= MYSQL_TIMESTAMP_NONE;
   format= args[1]->val_str(&format_str);

sql/mysql_priv.h

@@ -1220,6 +1220,7 @@ my_bool mysql_rm_tmp_tables(void);
 
 /* item_func.cc */
 extern bool check_reserved_words(LEX_STRING *name);
+extern enum_field_types agg_field_type(Item **items, uint nitems);
 
 /* strfunc.cc */
 ulonglong find_set(TYPELIB *lib, const char *x, uint length, CHARSET_INFO *cs,

sql/protocol.cc

@@ -824,6 +824,7 @@ bool Protocol_simple::store(const char *from, uint length,
 	      field_types[field_pos] == MYSQL_TYPE_DECIMAL ||
               field_types[field_pos] == MYSQL_TYPE_BIT ||
               field_types[field_pos] == MYSQL_TYPE_NEWDECIMAL ||
+              field_types[field_pos] == MYSQL_TYPE_NEWDATE ||
 	      (field_types[field_pos] >= MYSQL_TYPE_ENUM &&
 	       field_types[field_pos] <= MYSQL_TYPE_GEOMETRY));
   field_pos++;

sql/sql_insert.cc

@@ -3134,7 +3134,10 @@ static TABLE *create_table_from_items(THD *thd, HA_CREATE_INFO *create_info,
     create_field *cr_field;
     Field *field, *def_field;
     if (item->type() == Item::FUNC_ITEM)
-      field= item->tmp_table_field(&tmp_table);
+      if (item->result_type() != STRING_RESULT)
+        field= item->tmp_table_field(&tmp_table);
+      else
+        field= item->tmp_table_field_from_field_type(&tmp_table);
     else
       field= create_tmp_field(thd, &tmp_table, item, item->type(),
                               (Item ***) 0, &tmp_field, &def_field, 0, 0, 0, 0,