bk commit into 5.0 tree (evgen:1.2137)

[eugene]

Below is the list of changes that have just been committed into a local
5.0 repository of evgen. When evgen does a push these changes will
be propagated to the main repository and, within 24 hours after the
push, to the public repository.
For information on how to access the public repository
see http://dev.mysql.com/doc/mysql/en/installing-source-tree.html

ChangeSet
  1.2137 06/04/05 13:30:51 evgen@stripped +1 -0
  Merge epotemkin@stripped:/home/bk/mysql-5.0
  into sunlight.local:/local_work/16281-bug-5.0-mysql

  sql/field.h
    1.176 06/04/05 13:30:50 evgen@stripped +0 -0
    Auto merged

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	evgen
# Host:	sunlight.local
# Root:	/local_work/16281-bug-5.0-mysql/RESYNC

--- 1.175/sql/field.h	2006-03-29 20:58:01 +04:00
+++ 1.176/sql/field.h	2006-04-05 13:30:50 +04:00
@@ -986,20 +986,23 @@ public:
 
 class Field_string :public Field_longstr {
 public:
+  bool can_alter_field_type;
   Field_string(char *ptr_arg, uint32 len_arg,uchar *null_ptr_arg,
 	       uchar null_bit_arg,
 	       enum utype unireg_check_arg, const char *field_name_arg,
 	       struct st_table *table_arg, CHARSET_INFO *cs)
     :Field_longstr(ptr_arg, len_arg, null_ptr_arg, null_bit_arg,
-                   unireg_check_arg, field_name_arg, table_arg, cs) {};
+                   unireg_check_arg, field_name_arg, table_arg, cs),
+     can_alter_field_type(1) {};
   Field_string(uint32 len_arg,bool maybe_null_arg, const char *field_name_arg,
                struct st_table *table_arg, CHARSET_INFO *cs)
     :Field_longstr((char*) 0, len_arg, maybe_null_arg ? (uchar*) "": 0, 0,
-                   NONE, field_name_arg, table_arg, cs) {};
+                   NONE, field_name_arg, table_arg, cs),
+     can_alter_field_type(1) {};
 
   enum_field_types type() const
   {
-    return ((orig_table &&
+    return ((can_alter_field_type && orig_table &&
              orig_table->s->db_create_options & HA_OPTION_PACK_RECORD &&
 	     field_length >= 4) &&
             orig_table->s->frm_version < FRM_VER_TRUE_VARCHAR ?