diff --git a/mysql-test/include/mix1.inc b/mysql-test/include/mix1.inc
index e695e7d5570..3005e67935b 100644
--- a/mysql-test/include/mix1.inc
+++ b/mysql-test/include/mix1.inc
@@ -724,6 +724,19 @@ set @@sort_buffer_size=default;
 DROP TABLE t1,t2;
 
 #
+# Bug #32815: query with ORDER BY and a possible ref_or_null access
+#
+
+CREATE TABLE t1 (id int, type char(6), d int, INDEX idx(id,d)) ENGINE=InnoDB;
+INSERT INTO t1 VALUES 
+  (191, 'member', 1), (NULL, 'member', 3), (NULL, 'member', 4), (201, 'member', 2); 
+
+EXPLAIN SELECT * FROM t1 WHERE id=191 OR id IS NULL ORDER BY d;
+SELECT * FROM t1 WHERE id=191 OR id IS NULL ORDER BY d;
+
+DROP TABLE t1;
+
+
 # Test of behaviour with CREATE ... SELECT
 #
 
diff --git a/mysql-test/r/delayed.result b/mysql-test/r/delayed.result
index f6dde6b4060..bcda6ddb6ab 100644
--- a/mysql-test/r/delayed.result
+++ b/mysql-test/r/delayed.result
@@ -109,20 +109,12 @@ c1
 DROP TABLE t1;
 SET             @@auto_increment_offset=
 @bug20627_old_auto_increment_offset;
-Warnings:
-Warning	1292	Truncated incorrect auto-increment-offset value: '0'
 SET             @@auto_increment_increment=
 @bug20627_old_auto_increment_increment;
-Warnings:
-Warning	1292	Truncated incorrect auto-increment-increment value: '0'
 SET             @@session.auto_increment_offset=
 @bug20627_old_session_auto_increment_offset;
-Warnings:
-Warning	1292	Truncated incorrect auto-increment-offset value: '0'
 SET             @@session.auto_increment_increment=
 @bug20627_old_session_auto_increment_increment;
-Warnings:
-Warning	1292	Truncated incorrect auto-increment-increment value: '0'
 SET @bug20830_old_auto_increment_offset=
 @@auto_increment_offset;
 SET @bug20830_old_auto_increment_increment=
@@ -245,20 +237,12 @@ SUM(c1)
 DROP TABLE t1;
 SET             @@auto_increment_offset=
 @bug20830_old_auto_increment_offset;
-Warnings:
-Warning	1292	Truncated incorrect auto-increment-offset value: '0'
 SET             @@auto_increment_increment=
 @bug20830_old_auto_increment_increment;
-Warnings:
-Warning	1292	Truncated incorrect auto-increment-increment value: '0'
 SET             @@session.auto_increment_offset=
 @bug20830_old_session_auto_increment_offset;
-Warnings:
-Warning	1292	Truncated incorrect auto-increment-offset value: '0'
 SET             @@session.auto_increment_increment=
 @bug20830_old_session_auto_increment_increment;
-Warnings:
-Warning	1292	Truncated incorrect auto-increment-increment value: '0'
 CREATE TABLE t1(a BIT);
 INSERT DELAYED INTO t1 VALUES(1);
 FLUSH TABLE t1;
diff --git a/mysql-test/r/func_misc.result b/mysql-test/r/func_misc.result
index eb0f2553cb0..745a340ec94 100644
--- a/mysql-test/r/func_misc.result
+++ b/mysql-test/r/func_misc.result
@@ -212,6 +212,11 @@ test
 SELECT NAME_CONST('test', 'test');
 test
 test
+CREATE TABLE t1 (a int);
+INSERT INTO t1 VALUES (5), (2);
+SELECT NAME_CONST(x,2) FROM (SELECT a x FROM t1) t;
+ERROR HY000: Incorrect arguments to NAME_CONST
+DROP TABLE t1;
 CREATE TABLE t1(a INT);
 INSERT INTO t1 VALUES (), (), ();
 SELECT NAME_CONST(a, '1') FROM t1;
diff --git a/mysql-test/r/innodb_mysql.result b/mysql-test/r/innodb_mysql.result
index 469c030596b..87cf1acc10c 100644
--- a/mysql-test/r/innodb_mysql.result
+++ b/mysql-test/r/innodb_mysql.result
@@ -1344,6 +1344,18 @@ t1	CREATE TABLE `t1` (
   UNIQUE KEY `aa` (`a`(1))
 ) ENGINE=InnoDB DEFAULT CHARSET=latin1
 drop table t1;
+CREATE TABLE t1 (id int, type char(6), d int, INDEX idx(id,d)) ENGINE=InnoDB;
+INSERT INTO t1 VALUES 
+(191, 'member', 1), (NULL, 'member', 3), (NULL, 'member', 4), (201, 'member', 2);
+EXPLAIN SELECT * FROM t1 WHERE id=191 OR id IS NULL ORDER BY d;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	idx	NULL	NULL	NULL	3	Using where; Using filesort
+SELECT * FROM t1 WHERE id=191 OR id IS NULL ORDER BY d;
+id	type	d
+191	member	1
+NULL	member	3
+NULL	member	4
+DROP TABLE t1;
 End of 5.0 tests
 CREATE TABLE `t2` (
 `k` int(11) NOT NULL auto_increment,
diff --git a/mysql-test/r/range.result b/mysql-test/r/range.result
index 108264b3bf2..005969c7f18 100644
--- a/mysql-test/r/range.result
+++ b/mysql-test/r/range.result
@@ -1149,3 +1149,21 @@ explain select * from t2 where a=1000 and b<11;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ref	a	a	5	const	502	Using where
 drop table t1, t2;
+
+BUG#32198 "Comparison of DATE with DATETIME still not using indexes correctly"
+
+CREATE TABLE t1 (
+id int(11) NOT NULL auto_increment,
+dateval date default NULL,
+PRIMARY KEY  (id),
+KEY dateval (dateval)
+) AUTO_INCREMENT=173;
+INSERT INTO t1 VALUES
+(1,'2007-01-01'),(2,'2007-01-02'),(3,'2007-01-03'),(4,'2007-01-04'),
+(5,'2007-01-05'),(6,'2007-01-06'),(7,'2007-01-07'),(8,'2007-01-08'),
+(9,'2007-01-09'),(10,'2007-01-10'),(11,'2007-01-11');
+This must use range access:
+explain select * from t1 where dateval >= '2007-01-01 00:00:00' and dateval <= '2007-01-02 23:59:59';
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	range	dateval	dateval	4	NULL	2	Using where
+drop table t1;
diff --git a/mysql-test/t/func_misc.test b/mysql-test/t/func_misc.test
index 5a934ce712e..7a579088d23 100644
--- a/mysql-test/t/func_misc.test
+++ b/mysql-test/t/func_misc.test
@@ -213,6 +213,20 @@ SELECT NAME_CONST('test', 1.0);
 SELECT NAME_CONST('test', -1.0);
 SELECT NAME_CONST('test', 'test');
 
+#
+# Bug #27545: erroneous usage of NAME_CONST with a name as the first parameter 
+#             resolved against a column name of a derived table hangs the client
+#
+
+CREATE TABLE t1 (a int);
+INSERT INTO t1 VALUES (5), (2);
+
+--error ER_WRONG_ARGUMENTS
+SELECT NAME_CONST(x,2) FROM (SELECT a x FROM t1) t;
+
+DROP TABLE t1;
+
+
 #
 # Bug #32559: connection hangs on query with name_const
 #
diff --git a/mysql-test/t/range.test b/mysql-test/t/range.test
index 06c2ef248c4..e20f0370e2c 100644
--- a/mysql-test/t/range.test
+++ b/mysql-test/t/range.test
@@ -935,6 +935,26 @@ SELECT * FROM t1 WHERE item='A1' AND started<='2005-12-02 00:00:00';
 
 DROP TABLE t1;
 
+--echo
+--echo BUG#32198 "Comparison of DATE with DATETIME still not using indexes correctly"
+--echo
+CREATE TABLE t1 (
+  id int(11) NOT NULL auto_increment,
+  dateval date default NULL,
+  PRIMARY KEY  (id),
+  KEY dateval (dateval)
+) AUTO_INCREMENT=173;
+
+INSERT INTO t1 VALUES
+(1,'2007-01-01'),(2,'2007-01-02'),(3,'2007-01-03'),(4,'2007-01-04'),
+(5,'2007-01-05'),(6,'2007-01-06'),(7,'2007-01-07'),(8,'2007-01-08'),
+(9,'2007-01-09'),(10,'2007-01-10'),(11,'2007-01-11');
+
+--echo This must use range access:
+explain select * from t1 where dateval >= '2007-01-01 00:00:00' and dateval <= '2007-01-02 23:59:59';
+
+drop table t1;
+
 # End of 5.0 tests
 
 # BUG#22393 fix: Adjust 'ref' estimate if we have 'range' estimate for
diff --git a/sql/field.cc b/sql/field.cc
index 942c0538abb..93588992fed 100644
--- a/sql/field.cc
+++ b/sql/field.cc
@@ -5701,6 +5701,9 @@ void Field_date::sql_type(String &res) const
     1  Value was cut during conversion
     2  Wrong date string
     3  Datetime value that was cut (warning level NOTE)
+       This is used by opt_range.cc:get_mm_leaf(). Note that there is a
+       nearly-identical class Field_date doesn't ever return 3 from its
+       store function.
 */
 
 int Field_newdate::store(const char *from,uint len,CHARSET_INFO *cs)
diff --git a/sql/item.cc b/sql/item.cc
index ede92253f80..4d579597d21 100644
--- a/sql/item.cc
+++ b/sql/item.cc
@@ -1262,14 +1262,14 @@ bool Item_name_const::fix_fields(THD *thd, Item **ref)
   s.length(0);
 
   if (value_item->fix_fields(thd, &value_item) ||
-      name_item->fix_fields(thd, &name_item))
+      name_item->fix_fields(thd, &name_item) ||
+      !value_item->const_item() ||
+      !name_item->const_item() ||
+      !(item_name= name_item->val_str(&s))) // Can't have a NULL name 
+  {
+    my_error(ER_RESERVED_SYNTAX, MYF(0), "NAME_CONST");
     return TRUE;
-  if (!(value_item->const_item() && name_item->const_item()))
-    return TRUE;
-
-  if (!(item_name= name_item->val_str(&s)))
-    return TRUE; /* Can't have a NULL name */
-
+  }
   set_name(item_name->ptr(), (uint) item_name->length(), system_charset_info);
   max_length= value_item->max_length;
   decimals= value_item->decimals;
diff --git a/sql/item_cmpfunc.cc b/sql/item_cmpfunc.cc
index 00ae23fdb2b..1d1e28593d4 100644
--- a/sql/item_cmpfunc.cc
+++ b/sql/item_cmpfunc.cc
@@ -392,6 +392,7 @@ static bool convert_constant_item(THD *thd, Item_field *field_item,
 
     LINT_INIT(old_write_map);
     LINT_INIT(old_read_map);
+    LINT_INIT(orig_field_val);
 
     if (table)
     {
diff --git a/sql/opt_range.cc b/sql/opt_range.cc
index 7896da6201b..732f947c44e 100644
--- a/sql/opt_range.cc
+++ b/sql/opt_range.cc
@@ -5735,6 +5735,7 @@ get_mm_leaf(RANGE_OPT_PARAM *param, COND *conf_func, Field *field,
     {
       tree= new (alloc) SEL_ARG(field, 0, 0);
       tree->type= SEL_ARG::IMPOSSIBLE;
+      goto end;
     }
     else
     {
@@ -5743,8 +5744,32 @@ get_mm_leaf(RANGE_OPT_PARAM *param, COND *conf_func, Field *field,
         for the cases like int_field > 999999999999999999999999 as well.
       */
       tree= 0;
+      if (err == 3 && field->type() == FIELD_TYPE_DATE && 
+          (type == Item_func::GT_FUNC || type == Item_func::GE_FUNC || 
+           type == Item_func::LT_FUNC || type == Item_func::LE_FUNC) )
+      {
+        /*
+          We were saving DATETIME into a DATE column, the conversion went ok
+          but a non-zero time part was cut off.
+
+          In MySQL's SQL dialect, DATE and DATETIME are compared as datetime
+          values. Index over a DATE column uses DATE comparison. Changing 
+          from one comparison to the other is possible:
+
+          datetime(date_col)< '2007-12-10 12:34:55' -> date_col<='2007-12-10'
+          datetime(date_col)<='2007-12-10 12:34:55' -> date_col<='2007-12-10'
+
+          datetime(date_col)> '2007-12-10 12:34:55' -> date_col>='2007-12-10'
+          datetime(date_col)>='2007-12-10 12:34:55' -> date_col>='2007-12-10'
+
+          but we'll need to convert '>' to '>=' and '<' to '<='. This will
+          be done together with other types at the end of this function
+          (grep for field_is_equal_to_item)
+        */
+      }
+      else
+        goto end;
     }
-    goto end;
   } 
   if (err < 0)
   {
diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index 173a92736b9..3a142568080 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -3739,7 +3739,7 @@ update_ref_and_keys(THD *thd, DYNAMIC_ARRAY *keyuse,JOIN_TAB *join_tab,
     found_eq_constant=0;
     for (i=0 ; i < keyuse->elements-1 ; i++,use++)
     {
-      if (!use->used_tables)
+      if (!use->used_tables && use->optimize != KEY_OPTIMIZE_REF_OR_NULL)
 	use->table->const_key_parts[use->key]|= use->keypart_map;
       if (use->keypart != FT_KEYPART)
       {