diff --git a/client/mysqlbinlog.cc b/client/mysqlbinlog.cc
index 1a628bd08c7..d074fa19122 100644
--- a/client/mysqlbinlog.cc
+++ b/client/mysqlbinlog.cc
@@ -805,7 +805,7 @@ static my_time_t convert_str_to_timestamp(const char* str)
   int was_cut;
   MYSQL_TIME l_time;
   long dummy_my_timezone;
-  bool dummy_in_dst_time_gap;
+  my_bool dummy_in_dst_time_gap;
   /* We require a total specification (date AND time) */
   if (str_to_datetime(str, strlen(str), &l_time, 0, &was_cut) !=
       MYSQL_TIMESTAMP_DATETIME || was_cut)
diff --git a/sql/set_var.cc b/sql/set_var.cc
index 92948ea0ff6..ff37c46349d 100644
--- a/sql/set_var.cc
+++ b/sql/set_var.cc
@@ -1422,12 +1422,6 @@ bool sys_var_thd_ulong::update(THD *thd, set_var *var)
 {
   ulonglong tmp= var->save_result.ulonglong_value;
 
-#if SIZEOF_LONG != SIZEOF_LONGLONG
-  /* Avoid overflow on 32-bit platforms. */
-  if (tmp > ULONG_MAX)
-    tmp= ULONG_MAX;
-#endif
-
   /* Don't use bigger value than given with --maximum-variable-name=.. */
   if ((ulong) tmp > max_system_variables.*offset)
     tmp= max_system_variables.*offset;
@@ -3225,6 +3219,7 @@ byte *sys_var_thd_sql_mode::symbolic_mode_representation(THD *thd, ulong val,
 {
   char buff[256];
   String tmp(buff, sizeof(buff), &my_charset_latin1);
+  ulong length;
 
   tmp.length(0);
   for (uint i= 0; val; val>>= 1, i++)
@@ -3236,12 +3231,14 @@ byte *sys_var_thd_sql_mode::symbolic_mode_representation(THD *thd, ulong val,
       tmp.append(',');
     }
   }
-  if (tmp.length())
-    tmp.length(tmp.length() - 1);
-  *len= tmp.length();
-  return (byte*) thd->strmake(tmp.ptr(), tmp.length());
+
+  if ((length= tmp.length()))
+    length--;
+  *len= length;
+  return (byte*) thd->strmake(tmp.ptr(), length);
 }
 
+
 byte *sys_var_thd_sql_mode::value_ptr(THD *thd, enum_var_type type,
 				      LEX_STRING *base)
 {
@@ -3260,6 +3257,7 @@ void sys_var_thd_sql_mode::set_default(THD *thd, enum_var_type type)
     thd->variables.*offset= global_system_variables.*offset;
 }
 
+
 void fix_sql_mode_var(THD *thd, enum_var_type type)
 {
   if (type == OPT_GLOBAL)
diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index bd22f6bcc2a..5c0ab06935b 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -2757,11 +2757,9 @@ add_key_field(KEY_FIELD **key_fields,uint and_level, Item_func *cond,
     We use null_rejecting in add_not_null_conds() to add
     'othertbl.field IS NOT NULL' to tab->select_cond.
   */
-  (*key_fields)->null_rejecting= (cond->functype() == Item_func::EQ_FUNC) &&
-                                 ((*value)->type() == Item::FIELD_ITEM) &&
-
-                        (((Item_field*)*value)->field->maybe_null() ||
-			 ((Item_field *)*value)->field->table->maybe_null);
+  (*key_fields)->null_rejecting= ((cond->functype() == Item_func::EQ_FUNC) &&
+                                  ((*value)->type() == Item::FIELD_ITEM) &&
+                                  ((Item_field*)*value)->field->maybe_null());
   (*key_fields)++;
 }