Manually merged

client/mysqlbinlog.cc

@@ -71,6 +71,7 @@ static int port= 0;
 static const char* sock= 0;
 static const char* user = 0;
 static char* pass = 0;
+static char *charset= 0;
 
 static ulonglong start_position, stop_position;
 #define start_position_mot ((my_off_t)start_position)
@@ -707,6 +708,9 @@ static struct my_option my_long_options[] =
    "Used to reserve file descriptors for usage by this program",
    (gptr*) &open_files_limit, (gptr*) &open_files_limit, 0, GET_ULONG,
    REQUIRED_ARG, MY_NFILE, 8, OS_FILE_LIMIT, 0, 1, 0},
+  {"set-charset", OPT_SET_CHARSET,
+   "Add 'SET NAMES character_set' to the output.", (gptr*) &charset,
+   (gptr*) &charset, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
   {"short-form", 's', "Just show the queries, no extra info.",
    (gptr*) &short_form, (gptr*) &short_form, 0, GET_BOOL, NO_ARG, 0, 0, 0, 0,
    0, 0},
@@ -1422,6 +1426,12 @@ int main(int argc, char** argv)
     fprintf(result_file,
             "/*!32316 SET @OLD_SQL_LOG_BIN=@@SQL_LOG_BIN, SQL_LOG_BIN=0*/;\n");
 
+  if (charset)
+    fprintf(result_file,
+            "\n/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;"
+            "\n/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;"
+            "\n/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;"  
+            "\n/*!40101 SET NAMES %s */;\n", charset);
   /*
     In mysqlbinlog|mysql, don't want mysql to be disconnected after each
     transaction (which would be the case with GLOBAL.COMPLETION_TYPE==2).
@@ -1454,6 +1464,12 @@ int main(int argc, char** argv)
   if (disable_log_bin)
     fprintf(result_file, "/*!32316 SET SQL_LOG_BIN=@OLD_SQL_LOG_BIN*/;\n");
 
+  if (charset)
+    fprintf(result_file,
+            "/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;\n"
+            "/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;\n"
+            "/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;\n");
+
   if (tmpdir.list)
     free_tmpdir(&tmpdir);
   if (result_file != stdout)

mysql-test/r/cast.result

@@ -254,7 +254,7 @@ cast("2001-1-1" as datetime) = "2001-01-01 00:00:00"
 1
 select cast("1:2:3" as TIME) = "1:02:03";
 cast("1:2:3" as TIME) = "1:02:03"
-0
+1
 select cast(NULL as DATE);
 cast(NULL as DATE)
 NULL

mysql-test/r/func_concat.result

@@ -75,3 +75,10 @@ a
 1234562
 x
 drop table t1;
+select concat((select x from (select 'a' as x) as t1 ),
+(select y from (select 'b' as y) as t2 )) from (select 1 union select 2 )
+as t3;
+concat((select x from (select 'a' as x) as t1 ),
+(select y from (select 'b' as y) as t2 ))
+ab
+ab

mysql-test/r/func_time.result

@@ -751,6 +751,47 @@ select monthname(str_to_date(null, '%m')), monthname(str_to_date(null, '%m')),
 monthname(str_to_date(1, '%m')), monthname(str_to_date(0, '%m'));
 monthname(str_to_date(null, '%m'))	monthname(str_to_date(null, '%m'))	monthname(str_to_date(1, '%m'))	monthname(str_to_date(0, '%m'))
 NULL	NULL	January	NULL
+create table t1(f1 date, f2 time, f3 datetime);
+insert into t1 values ("2006-01-01", "12:01:01", "2006-01-01 12:01:01");
+insert into t1 values ("2006-01-02", "12:01:02", "2006-01-02 12:01:02");
+select f1 from t1 where f1 between "2006-1-1" and 20060101;
+f1
+2006-01-01
+select f1 from t1 where f1 between "2006-1-1" and "2006.1.1";
+f1
+2006-01-01
+select f1 from t1 where date(f1) between "2006-1-1" and "2006.1.1";
+f1
+2006-01-01
+select f2 from t1 where f2 between "12:1:2" and "12:2:2";
+f2
+12:01:02
+select f2 from t1 where time(f2) between "12:1:2" and "12:2:2";
+f2
+12:01:02
+select f3 from t1 where f3 between "2006-1-1 12:1:1" and "2006-1-1 12:1:2";
+f3
+2006-01-01 12:01:01
+select f3 from t1 where timestamp(f3) between "2006-1-1 12:1:1" and "2006-1-1 12:1:2";
+f3
+2006-01-01 12:01:01
+select f1 from t1 where "2006-1-1" between f1 and f3;
+f1
+2006-01-01
+select f1 from t1 where "2006-1-1" between date(f1) and date(f3);
+f1
+2006-01-01
+select f1 from t1 where "2006-1-1" between f1 and 'zzz';
+f1
+Warnings:
+Warning	1292	Truncated incorrect date value: 'zzz'
+select f1 from t1 where makedate(2006,1) between date(f1) and date(f3);
+f1
+2006-01-01
+select f1 from t1 where makedate(2006,2) between date(f1) and date(f3);
+f1
+2006-01-02
+drop table t1;
 explain extended select timestampdiff(SQL_TSI_WEEK, '2001-02-01', '2001-05-01') as a1,
 timestampdiff(SQL_TSI_FRAC_SECOND, '2001-02-01 12:59:59.120000', '2001-05-01 12:58:58.119999') as a2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

mysql-test/t/func_concat.test

@@ -52,6 +52,13 @@ select 'a' union select concat('a', -0.0);
 --replace_result a-0.0000 a0.0000
 select 'a' union select concat('a', -0.0000);
 
+#
+# Bug#16716: subselect in concat() may lead to a wrong result
+#
+select concat((select x from (select 'a' as x) as t1 ),
+  (select y from (select 'b' as y) as t2 )) from (select 1 union select 2 )
+  as t3;
+
 # End of 4.1 tests
 
 #

mysql-test/t/func_time.test

@@ -367,6 +367,26 @@ select last_day('2005-01-00');
 select monthname(str_to_date(null, '%m')), monthname(str_to_date(null, '%m')),
        monthname(str_to_date(1, '%m')), monthname(str_to_date(0, '%m'));
 
+#
+# Bug#16377 result of DATE/TIME functions were compared as strings which
+#           can lead to a wrong result.
+#
+create table t1(f1 date, f2 time, f3 datetime);
+insert into t1 values ("2006-01-01", "12:01:01", "2006-01-01 12:01:01");
+insert into t1 values ("2006-01-02", "12:01:02", "2006-01-02 12:01:02");
+select f1 from t1 where f1 between "2006-1-1" and 20060101;
+select f1 from t1 where f1 between "2006-1-1" and "2006.1.1";
+select f1 from t1 where date(f1) between "2006-1-1" and "2006.1.1";
+select f2 from t1 where f2 between "12:1:2" and "12:2:2";
+select f2 from t1 where time(f2) between "12:1:2" and "12:2:2";
+select f3 from t1 where f3 between "2006-1-1 12:1:1" and "2006-1-1 12:1:2";
+select f3 from t1 where timestamp(f3) between "2006-1-1 12:1:1" and "2006-1-1 12:1:2";
+select f1 from t1 where "2006-1-1" between f1 and f3;
+select f1 from t1 where "2006-1-1" between date(f1) and date(f3);
+select f1 from t1 where "2006-1-1" between f1 and 'zzz';
+select f1 from t1 where makedate(2006,1) between date(f1) and date(f3);
+select f1 from t1 where makedate(2006,2) between date(f1) and date(f3);
+drop table t1;
 # End of 4.1 tests
 
 explain extended select timestampdiff(SQL_TSI_WEEK, '2001-02-01', '2001-05-01') as a1,

sql/field.cc

@@ -9037,7 +9037,11 @@ bool
 Field::set_warning(MYSQL_ERROR::enum_warning_level level, uint code,
                    int cuted_increment)
 {
-  THD *thd= table->in_use;
+  /*
+    If this field was created only for type conversion purposes it
+    will have table == NULL.
+  */
+  THD *thd= table ? table->in_use : current_thd;
   if (thd->count_cuted_fields)
   {
     thd->cuted_fields+= cuted_increment;
@@ -9074,7 +9078,8 @@ Field::set_datetime_warning(MYSQL_ERROR::enum_warning_level level, uint code,
 {
   if (table->in_use->really_abort_on_warning() ||
       set_warning(level, code, cuted_increment))
-    make_truncated_value_warning(table->in_use, str, str_length, ts_type,
+    make_truncated_value_warning(table ? table->in_use : current_thd,
+                                 str, str_length, ts_type,
                                  field_name);
 }
 
@@ -9106,8 +9111,8 @@ Field::set_datetime_warning(MYSQL_ERROR::enum_warning_level level, uint code,
   {
     char str_nr[22];
     char *str_end= longlong10_to_str(nr, str_nr, -10);
-    make_truncated_value_warning(table->in_use, str_nr, 
-                                 (uint) (str_end - str_nr), 
+    make_truncated_value_warning(table ? table->in_use : current_thd,
+                                 str_nr, (uint) (str_end - str_nr), 
                                  ts_type, field_name);
   }
 }
@@ -9139,7 +9144,35 @@ Field::set_datetime_warning(MYSQL_ERROR::enum_warning_level level, uint code,
     /* DBL_DIG is enough to print '-[digits].E+###' */
     char str_nr[DBL_DIG + 8];
     uint str_len= my_sprintf(str_nr, (str_nr, "%g", nr));
-    make_truncated_value_warning(table->in_use, str_nr, str_len, ts_type,
+    make_truncated_value_warning(table ? table->in_use : current_thd,
+                                 str_nr, str_len, ts_type,
                                  field_name);
   }
 }
+
+/*
+  maximum possible display length for blob
+
+  SYNOPSIS
+    Field_blob::max_length()
+
+  RETURN
+    length
+*/
+uint32 Field_blob::max_length()
+{
+  switch (packlength)
+  {
+  case 1:
+    return 255 * field_charset->mbmaxlen;
+  case 2:
+    return 65535 * field_charset->mbmaxlen;
+  case 3:
+    return 16777215 * field_charset->mbmaxlen;
+  case 4:
+    return (uint32) 4294967295U;
+  default:
+    DBUG_ASSERT(0); // we should never go here
+    return 0;
+  }
+}

sql/item.h

@@ -794,6 +794,14 @@ class Item {
   {
     return 0;
   }
+  /*
+    result_as_longlong() must return TRUE for Items representing DATE/TIME
+    functions and DATE/TIME table fields.
+    Those Items have result_type()==STRING_RESULT (and not INT_RESULT), but
+    their values should be compared as integers (because the integer
+    representation is more precise than the string one).
+  */
+  virtual bool result_as_longlong() { return FALSE; }
 };
 
 
@@ -1219,6 +1227,10 @@ class Item_field :public Item_ident
     return 0;
   }
   void cleanup();
+  bool result_as_longlong()
+  {
+    return field->can_be_compared_as_longlong();
+  }
   Item_equal *find_item_equal(COND_EQUAL *cond_equal);
   Item *equal_fields_propagator(byte *arg);
   Item *set_no_const_sub(byte *arg);
@@ -1827,6 +1839,10 @@ class Item_ref :public Item_ident
   bool walk(Item_processor processor, byte *arg)
   { return (*ref)->walk(processor, arg); }
   void print(String *str);
+  bool result_as_longlong()
+  {
+    return (*ref)->result_as_longlong();
+  }
   void cleanup();
   Item_field *filed_for_view_update()
     { return (*ref)->filed_for_view_update(); }

sql/item_cmpfunc.cc

@@ -68,6 +68,7 @@ static void agg_result_type(Item_result *type, Item **items, uint nitems)
 
   SYNOPSIS:
     agg_cmp_type()
+    thd          thread handle
     type   [out] the aggregated type
     items        array of items to aggregate the type from
     nitems       number of items in the array
@@ -82,36 +83,133 @@ static void agg_result_type(Item_result *type, Item **items, uint nitems)
     If all items are constants the type will be aggregated from all items.
     If there are some non-constant items then only types of non-constant
     items will be used for aggregation.
+    If there are DATE/TIME fields/functions in the list and no string
+    fields/functions in the list then:
+      The INT_RESULT type will be used for aggregation instead of orginal
+      result type of any DATE/TIME field/function in the list
+      All constant items in the list will be converted to a DATE/TIME using
+      found field or result field of found function.
+
+    Implementation notes:
+      The code is equvalent to:
+      1. Check the list for presense of a STRING field/function.
+         Collect the is_const flag.
+      2. Get a Field* object to use for type coercion
+      3. Perform type conversion.
+      1 and 2 are implemented in 2 loops. The first searches for a DATE/TIME
+      field/function and checks presense of a STRING field/function.
+      The second loop works only if a DATE/TIME field/function is found.
+      It checks presense of a STRING field/function in the rest of the list.
+
+  TODO
+    1) The current implementation can produce false comparison results for
+    expressions like:
+      date_time_field BETWEEN string_field_with_dates AND string_constant
+    if the string_constant will omit some of leading zeroes.
+    In order to fully implement correct comparison of DATE/TIME the new
+    DATETIME_RESULT result type should be introduced and agg_cmp_type()
+    should return the DATE/TIME field used for the conversion. Later
+    this field can be used by comparison functions like Item_func_between to
+    convert string values to ints on the fly and thus return correct results.
+    This modification will affect functions BETWEEN, IN and CASE.
+
+    2) If in the list a DATE field/function and a DATETIME field/function
+    are present in the list then the first found field/function will be
+    used for conversion. This may lead to wrong results and probably should
+    be fixed.
 */
 
 static void agg_cmp_type(THD *thd, Item_result *type, Item **items, uint nitems)
 {
   uint i;
+  Item::Type res;
+  char *buff= NULL;
+  uchar null_byte;
   Field *field= NULL;
 
-  /* If the first argument is a FIELD_ITEM, pull out the field. */
-  if (items[0]->real_item()->type() == Item::FIELD_ITEM)
-    field=((Item_field *)(items[0]->real_item()))->field;
-  /* But if it can't be compared as a longlong, we don't really care. */
-  if (field && !field->can_be_compared_as_longlong())
-    field= NULL;
-
-  type[0]= items[0]->result_type();
+  /* Search for date/time fields/functions */
+  for (i= 0; i < nitems; i++)
+  {
+    if (!items[i]->result_as_longlong())
+    {
+      /* Do not convert anything if a string field/function is present */
+      if (!items[i]->const_item() && items[i]->result_type() == STRING_RESULT)
+      {
+        i= nitems;
+        break;
+      }
+      continue;
+    }
+    if ((res= items[i]->real_item()->type()) == Item::FIELD_ITEM)
+    {
+      field= ((Item_field *)items[i]->real_item())->field;
+      break;
+    }
+    else if (res == Item::FUNC_ITEM)
+    {
+      field= items[i]->tmp_table_field_from_field_type(0);
+      if (field)
+        buff= alloc_root(thd->mem_root, field->max_length());
+      if (!buff || !field)
+      {
+        if (field)
+          delete field;
+        if (buff)
+          my_free(buff, MYF(MY_WME));
+        field= 0;
+      }
+      else
+        field->move_field(buff, &null_byte, 0);
+      break;
+    }
+  }
+  if (field)
+  {
+    /* Check the rest of the list for presense of a string field/function. */
+    for (i++ ; i < nitems; i++)
+    {
+      if (!items[i]->const_item() && items[i]->result_type() == STRING_RESULT &&
+          !items[i]->result_as_longlong())
+      {
+        field= 0;
+        break;
+      }
+    }
+  }
   /* Reset to 0 on first occurence of non-const item. 1 otherwise */
   bool is_const= items[0]->const_item();
+  /*
+    If the first item is a date/time function then its result should be
+    compared as int
+  */
+  if (field)
+  {
+    /* Suppose we are comparing dates and some non-constant items are present. */
+    type[0]= INT_RESULT;
+    is_const= 0;
+  }
+  else
+    type[0]= items[0]->result_type();
 
-  for (i= 1 ; i < nitems ; i++)
+  for (i= 0; i < nitems ; i++)
   {
     if (!items[i]->const_item())
     {
-      type[0]= is_const ? items[i]->result_type() :
-                 item_cmp_type(type[0], items[i]->result_type());
+      Item_result result= field && items[i]->result_as_longlong() ?
+                            INT_RESULT : items[i]->result_type();
+      type[0]= is_const ? result : item_cmp_type(type[0], result);
       is_const= 0;
     }
     else if (is_const)
       type[0]= item_cmp_type(type[0], items[i]->result_type());
-    else if (field && convert_constant_item(thd, field, &items[i]))
-      type[0]= INT_RESULT;
+    else if (field)
+      convert_constant_item(thd, field, &items[i]);
+  }
+
+  if (res == Item::FUNC_ITEM && field)
+  {
+    delete field;
+    my_free(buff, MYF(MY_WME));
   }
 }
 
@@ -1129,9 +1227,8 @@ void Item_func_between::fix_length_and_dec()
     return;
   agg_cmp_type(thd, &cmp_type, args, 3);
 
-  if (cmp_type == STRING_RESULT &&
-      agg_arg_charsets(cmp_collation, args, 3, MY_COLL_CMP_CONV))
-    return;
+  if (cmp_type == STRING_RESULT)
+      agg_arg_charsets(cmp_collation, args, 3, MY_COLL_CMP_CONV);
 }
 
 

sql/item_cmpfunc.h

@@ -45,8 +45,11 @@ class Arg_comparator: public Sql_alloc
   int set_compare_func(Item_bool_func2 *owner, Item_result type);
   inline int set_compare_func(Item_bool_func2 *owner_arg)
   {
-    return set_compare_func(owner_arg, item_cmp_type((*a)->result_type(),
-						     (*b)->result_type()));
+    Item_result ar= (*a)->result_as_longlong() && (*b)->const_item() ?
+                      INT_RESULT : (*a)->result_type();
+    Item_result br= (*b)->result_as_longlong() && (*a)->const_item() ?
+                      INT_RESULT : (*b)->result_type();
+    return set_compare_func(owner_arg, item_cmp_type(ar, br));
   }
   inline int set_cmp_func(Item_bool_func2 *owner_arg,
 			  Item **a1, Item **a2,
@@ -59,8 +62,11 @@ class Arg_comparator: public Sql_alloc
   inline int set_cmp_func(Item_bool_func2 *owner_arg,
 			  Item **a1, Item **a2)
   {
-    return set_cmp_func(owner_arg, a1, a2, item_cmp_type((*a1)->result_type(),
-							 (*a2)->result_type()));
+    Item_result ar= (*a1)->result_as_longlong() && (*a2)->const_item() ?
+                      INT_RESULT : (*a1)->result_type();
+    Item_result br= (*a2)->result_as_longlong() && (*a1)->const_item() ?
+                      INT_RESULT : (*a2)->result_type();
+    return set_cmp_func(owner_arg, a1, a2, item_cmp_type(ar, br));
   }
   inline int compare() { return (this->*func)(); }
 

sql/item_strfunc.cc

@@ -288,11 +288,13 @@ String *Item_func_concat::val_str(String *str)
   DBUG_ASSERT(fixed == 1);
   String *res,*res2,*use_as_buff;
   uint i;
+  bool is_const= 0;
 
   null_value=0;
   if (!(res=args[0]->val_str(str)))
     goto null;
   use_as_buff= &tmp_value;
+  is_const= args[0]->const_item();
   for (i=1 ; i < arg_count ; i++)
   {
     if (res->length() == 0)
@@ -315,7 +317,7 @@ String *Item_func_concat::val_str(String *str)
 			    current_thd->variables.max_allowed_packet);
 	goto null;
       }
-      if (res->alloced_length() >= res->length()+res2->length())
+      if (!is_const && res->alloced_length() >= res->length()+res2->length())
       {						// Use old buffer
 	res->append(*res2);
       }
@@ -370,6 +372,7 @@ String *Item_func_concat::val_str(String *str)
 	res= &tmp_value;
 	use_as_buff=str;
       }
+      is_const= 0;
     }
   }
   res->set_charset(collation.collation);

sql/item_timefunc.cc

@@ -2464,6 +2464,20 @@ String *Item_datetime_typecast::val_str(String *str)
 }
 
 
+longlong Item_datetime_typecast::val_int()
+{
+  DBUG_ASSERT(fixed == 1);
+  TIME ltime;
+  if (get_arg0_date(&ltime,1))
+  {
+    null_value= 1;
+    return 0;
+  }
+
+  return TIME_to_ulonglong_datetime(&ltime);
+}
+
+
 bool Item_time_typecast::get_time(TIME *ltime)
 {
   bool res= get_arg0_time(ltime);
@@ -2478,6 +2492,17 @@ bool Item_time_typecast::get_time(TIME *ltime)
 }
 
 
+longlong Item_time_typecast::val_int()
+{
+  TIME ltime;
+  if (get_time(&ltime))
+  {
+    null_value= 1;
+    return 0;
+  }
+  return ltime.hour * 10000L + ltime.minute * 100 + ltime.second;
+}
+
 String *Item_time_typecast::val_str(String *str)
 {
   DBUG_ASSERT(fixed == 1);
@@ -2517,6 +2542,14 @@ String *Item_date_typecast::val_str(String *str)
   return 0;
 }
 
+longlong Item_date_typecast::val_int()
+{
+  DBUG_ASSERT(fixed == 1);
+  TIME ltime;
+  if (args[0]->get_date(&ltime, TIME_FUZZY_DATE))
+    return 0;
+  return (longlong) (ltime.year * 10000L + ltime.month * 100 + ltime.day);
+}
 
 /*
   MAKEDATE(a,b) is a date function that creates a date value 
@@ -2553,6 +2586,33 @@ String *Item_func_makedate::val_str(String *str)
 }
 
 
+longlong Item_func_makedate::val_int()
+{
+  DBUG_ASSERT(fixed == 1);
+  TIME l_time;
+  long daynr=  (long) args[1]->val_int();
+  long yearnr= (long) args[0]->val_int();
+  long days;
+
+  if (args[0]->null_value || args[1]->null_value ||
+      yearnr < 0 || daynr <= 0)
+    goto err;
+
+  days= calc_daynr(yearnr,1,1) + daynr - 1;
+  /* Day number from year 0 to 9999-12-31 */
+  if (days >= 0 && days < MAX_DAY_NUMBER)
+  {
+    null_value=0;
+    get_date_from_daynr(days,&l_time.year,&l_time.month,&l_time.day);
+    return (longlong) (l_time.year * 10000L + l_time.month * 100 + l_time.day);
+  }
+
+err:
+  null_value= 1;
+  return 0;
+}
+
+
 void Item_func_add_time::fix_length_and_dec()
 {
   enum_field_types arg0_field_type;

sql/item_timefunc.h

@@ -344,6 +344,7 @@ class Item_date :public Item_func
   {
     return (new Field_date(maybe_null, name, t_arg, &my_charset_bin));
   }  
+  bool result_as_longlong() { return TRUE; }
 };
 
 
@@ -359,6 +360,7 @@ class Item_date_func :public Item_str_func
   {
     return (new Field_datetime(maybe_null, name, t_arg, &my_charset_bin));
   }
+  bool result_as_longlong() { return TRUE; }
 };
 
 
@@ -388,6 +390,7 @@ class Item_func_curtime :public Item_func
     TIME representation using UTC-SYSTEM or per-thread time zone.
   */
   virtual void store_now_in_TIME(TIME *now_time)=0;
+  bool result_as_longlong() { return TRUE; }
 };
 
 
@@ -622,6 +625,7 @@ class Item_func_sec_to_time :public Item_str_func
   {
     return (new Field_time(maybe_null, name, t_arg, &my_charset_bin));
   }
+  bool result_as_longlong() { return TRUE; }
 };
 
 /*
@@ -752,6 +756,8 @@ class Item_date_typecast :public Item_typecast_maybe_null
     max_length= 10;
     maybe_null= 1;
   }
+  bool result_as_longlong() { return TRUE; }
+  longlong val_int();
 };
 
 
@@ -768,6 +774,8 @@ class Item_time_typecast :public Item_typecast_maybe_null
   {
     return (new Field_time(maybe_null, name, t_arg, &my_charset_bin));
   }
+  bool result_as_longlong() { return TRUE; }
+  longlong val_int();
 };
 
 
@@ -783,6 +791,8 @@ class Item_datetime_typecast :public Item_typecast_maybe_null
   {
     return (new Field_datetime(maybe_null, name, t_arg, &my_charset_bin));
   }
+  bool result_as_longlong() { return TRUE; }
+  longlong val_int();
 };
 
 class Item_func_makedate :public Item_str_func
@@ -801,6 +811,8 @@ class Item_func_makedate :public Item_str_func
   {
     return (new Field_date(maybe_null, name, t_arg, &my_charset_bin));
   }
+  bool result_as_longlong() { return TRUE; }
+  longlong val_int();
 };
 
 

sql/opt_sum.cc

@@ -569,10 +569,6 @@ static bool matching_cond(bool max_fl, TABLE_REF *ref, KEY *keyinfo,
       break;                        // Found a part od the key for the field
   }
 
-#if 0
-  if (part->length != (((Item_field*) args[0])->field)->field_length)
-    return 0;
-#endif
   bool is_field_part= part == field_part;
   if (!(is_field_part || eq_type))
     return 0;

sql/structs.h

@@ -70,7 +70,13 @@ typedef struct st_key_part_info {	/* Info about a key part */
   Field *field;
   uint	offset;				/* offset in record (from 0) */
   uint	null_offset;			/* Offset to null_bit in record */
-  uint16 length;			/* Length of key_part */
+  uint16 length;                        /* Length of keypart value in bytes */
+  /* 
+    Number of bytes required to store the keypart value. This may be
+    different from the "length" field as it also counts
+     - possible NULL-flag byte (see HA_KEY_NULL_LENGTH)
+     - possible HA_KEY_BLOB_LENGTH bytes needed to store actual value length.
+  */
   uint16 store_length;
   uint16 key_type;
   uint16 fieldnr;			/* Fieldnum in UNIREG */