Several problems were fixed (mostly BLOB+charset related)

Fixed that MyISAM were not working properly with non-8bit charsets in some cases
CONVERT() function now works properly


myisam/mi_unique.c:
  Fix for non-8bit charsets
sql/field.cc:
  Initialize blobs with charset
sql/field.h:
  Initialize blobs with charset
sql/field_conv.cc:
  Initialize blobs with charset
sql/item_strfunc.cc:
  CONVERT() function now has working fix_lenght_and_dec(), and it's own 
  fix_fields()
sql/item_strfunc.h:
  CONVERT() function now has working fix_lenght_and_dec(), and it's own 
  fix_fields()
sql/sql_select.cc:
  Fixes for BLOBs
  Fixed that wrong charset was used in some cases

myisam/mi_unique.c

@@ -98,6 +98,14 @@ ha_checksum mi_unique_hash(MI_UNIQUEDEF *def, const byte *record)
     }
     end= pos+length;
     if (type == HA_KEYTYPE_TEXT || type == HA_KEYTYPE_VARTEXT)
+    {
+      if (keyseg->charset->hash_sort)
+      {
+        ulong nr=1, nr2=4;
+        keyseg->charset->hash_sort(keyseg->charset,(const uchar*)pos,length,&nr, &nr2);
+        crc=nr;
+      }
+      else
       {
         uchar *sort_order=keyseg->charset->sort_order;
         while (pos != end)
@@ -105,6 +113,7 @@ ha_checksum mi_unique_hash(MI_UNIQUEDEF *def, const byte *record)
 	       (((uchar)  sort_order[*(uchar*) pos++]))) +
 	    (crc >> (8*sizeof(ha_checksum)-8));
       }
+    }
     else
       while (pos != end)
 	crc=((crc << 8) +
@@ -172,6 +181,13 @@ int mi_unique_comp(MI_UNIQUEDEF *def, const byte *a, const byte *b,
     }
     end= pos_a+length;
     if (type == HA_KEYTYPE_TEXT || type == HA_KEYTYPE_VARTEXT)
+    {
+      if (use_strcoll(keyseg->charset))
+      {
+	if (my_strnncoll(keyseg->charset,pos_a,length,pos_b,length))
+	  return 1;
+      }
+      else
       {
        uchar *sort_order=keyseg->charset->sort_order;
        while (pos_a != end)
@@ -179,6 +195,7 @@ int mi_unique_comp(MI_UNIQUEDEF *def, const byte *a, const byte *b,
  	    sort_order[*(uchar*) pos_b++])
  	  return 1;
       }
+    }
     else
       while (pos_a != end)
 	if (*pos_a++ != *pos_b++)

sql/field.cc

@@ -3782,10 +3782,10 @@ uint Field_varstring::max_packed_col_length(uint max_length)
 Field_blob::Field_blob(char *ptr_arg, uchar *null_ptr_arg, uchar null_bit_arg,
 		       enum utype unireg_check_arg, const char *field_name_arg,
 		       struct st_table *table_arg,uint blob_pack_length,
-		       bool binary_arg)
+		       bool binary_arg, CHARSET_INFO *cs)
   :Field_str(ptr_arg, (1L << min(blob_pack_length,3)*8)-1L,
 	     null_ptr_arg, null_bit_arg, unireg_check_arg, field_name_arg,
-	     table_arg, default_charset_info),
+	     table_arg, cs),
    packlength(blob_pack_length),binary_flag(binary_arg), geom_flag(true)
 {
   flags|= BLOB_FLAG;
@@ -3967,9 +3967,9 @@ String *Field_blob::val_str(String *val_buffer __attribute__((unused)),
   char *blob;
   memcpy_fixed(&blob,ptr+packlength,sizeof(char*));
   if (!blob)
-    val_ptr->set("",0,default_charset_info);	// A bit safer than ->length(0)
+    val_ptr->set("",0,field_charset);	// A bit safer than ->length(0)
   else
-    val_ptr->set((const char*) blob,get_length(ptr),default_charset_info);
+    val_ptr->set((const char*) blob,get_length(ptr),field_charset);
   return val_ptr;
 }
 
@@ -4782,7 +4782,8 @@ Field *make_field(char *ptr, uint32 field_length,
     if (f_is_blob(pack_flag))
       return new Field_blob(ptr,null_pos,null_bit,
 			    unireg_check, field_name, table,
-			    pack_length,f_is_binary(pack_flag) != 0);
+			    pack_length,f_is_binary(pack_flag) != 0,
+			    default_charset_info);
     if (f_is_geom(pack_flag))
       return new Field_geom(ptr,null_pos,null_bit,
 			    unireg_check, field_name, table,

sql/field.h

@@ -842,11 +842,11 @@ class Field_blob :public Field_str {
   Field_blob(char *ptr_arg, uchar *null_ptr_arg, uchar null_bit_arg,
 	     enum utype unireg_check_arg, const char *field_name_arg,
 	     struct st_table *table_arg,uint blob_pack_length,
-	     bool binary_arg);
+	     bool binary_arg, CHARSET_INFO *cs);
   Field_blob(uint32 len_arg,bool maybe_null_arg, const char *field_name_arg,
-	     struct st_table *table_arg, bool binary_arg)
+	     struct st_table *table_arg, bool binary_arg, CHARSET_INFO *cs)
     :Field_str((char*) 0,len_arg, maybe_null_arg ? (uchar*) "": 0,0,
-	       NONE, field_name_arg, table_arg, default_charset_info),
+	       NONE, field_name_arg, table_arg, cs),
     packlength(3),binary_flag(binary_arg), geom_flag(true)
     {
       flags|= BLOB_FLAG;
@@ -930,11 +930,12 @@ class Field_geom :public Field_blob {
 	     struct st_table *table_arg,uint blob_pack_length,
              bool binary_arg)
      :Field_blob(ptr_arg, null_ptr_arg, null_bit_arg, unireg_check_arg, 
-                 field_name_arg, table_arg, blob_pack_length,binary_arg) {}
+                 field_name_arg, table_arg, blob_pack_length,binary_arg,
+                 default_charset_info) {}
   Field_geom(uint32 len_arg,bool maybe_null_arg, const char *field_name_arg,
 	     struct st_table *table_arg, bool binary_arg)
      :Field_blob(len_arg, maybe_null_arg, field_name_arg,
-                 table_arg, binary_arg) {}
+                 table_arg, binary_arg, default_charset_info) {}
   enum ha_base_keytype key_type() const { return HA_KEYTYPE_VARBINARY; }
 
   void get_key_image(char *buff,uint length, imagetype type);

sql/field_conv.cc

@@ -508,7 +508,8 @@ void field_conv(Field *to,Field *from)
     if (!blob->value.is_alloced() &&
 	from->real_type() != FIELD_TYPE_STRING)
       blob->value.copy();
-    blob->store(blob->value.ptr(),blob->value.length(),default_charset_info);
+    blob->store(blob->value.ptr(),blob->value.length(),
+      to->binary()?default_charset_info:((Field_str*)to)->charset());
     return;
   }
   if ((from->result_type() == STRING_RESULT &&

sql/item_strfunc.cc

@@ -1799,7 +1799,7 @@ String *Item_func_conv_charset::val_str(String *str)
   s=(const uchar*)arg->ptr();
   se=s+arg->length();
   
-  dmaxlen=arg->length()*(conv_charset->mbmaxlen?conv_charset->mbmaxlen:1)+1;
+  dmaxlen=arg->length()*(to->mbmaxlen?to->mbmaxlen:1)+1;
   str->alloc(dmaxlen);
   d0=d=(unsigned char*)str->ptr();
   de=d+dmaxlen;
@@ -1841,7 +1841,7 @@ String *Item_func_conv_charset::val_str(String *str)
 
 void Item_func_conv_charset::fix_length_and_dec()
 {
-  /* BAR TODO: What to do here??? */
+  max_length = args[0]->max_length*(conv_charset->mbmaxlen?conv_charset->mbmaxlen:1);
 }
 
 
@@ -1911,23 +1911,41 @@ String *Item_func_conv_charset3::val_str(String *str)
   return str;
 }
 
-String *Item_func_charset::val_str(String *str)
+
+bool Item_func_conv_charset::fix_fields(THD *thd,struct st_table_list *tables)
 {
-  String *res = args[0]->val_str(str);
+  char buff[STACK_BUFF_ALLOC];			// Max argument in function
+  binary=0;
+  used_tables_cache=0;
+  const_item_cache=1;
   
-  if ((null_value=(args[0]->null_value || !res->charset())))
+  if (thd && check_stack_overrun(thd,buff))
+    return 0;					// Fatal error if flag is set!
+  if (args[0]->fix_fields(thd,tables))
+    return 1;
+  maybe_null=args[0]->maybe_null;
+  binary=args[0]->binary;
+  str_value.set_charset(conv_charset);
+  fix_length_and_dec();
   return 0;
-  str->copy(res->charset()->name,strlen(res->charset()->name));
-  return str;
 }
 
 
 void Item_func_conv_charset3::fix_length_and_dec()
 {
-  /* BAR TODO: What to do here??? */
+  max_length = args[0]->max_length;
 }
 
 
+String *Item_func_charset::val_str(String *str)
+{
+  String *res = args[0]->val_str(str);
+
+  if ((null_value=(args[0]->null_value || !res->charset())))
+    return 0;
+  str->copy(res->charset()->name,strlen(res->charset()->name));
+  return str;
+}
 
 
 String *Item_func_hex::val_str(String *str)

sql/item_strfunc.h

@@ -40,7 +40,8 @@ class Item_str_func :public Item_func
     if (!t_arg) 
       return result_field;
     return (max_length > 255) ?
-      (Field *)new Field_blob(max_length,maybe_null, name,t_arg, binary) :
+      (Field *)new Field_blob(max_length,maybe_null, name,t_arg, binary,
+      			      default_charset_info) :
       (Field *) new Field_string(max_length,maybe_null, name,t_arg, binary, 
                                  default_charset_info);
   }  
@@ -488,6 +489,7 @@ class Item_func_conv_charset :public Item_str_func
   {
     conv_charset=cs;
   }
+  bool fix_fields(THD *thd,struct st_table_list *tables);
   String *val_str(String *);
   void fix_length_and_dec();
   const char *func_name() const { return "conv_charset"; }

sql/sql_select.cc

@@ -3523,7 +3523,7 @@ Field *create_tmp_field(THD *thd, TABLE *table,Item *item, Item::Type type,
       case STRING_RESULT:
 	if (item_sum->max_length > 255)
 	  return  new Field_blob(item_sum->max_length,maybe_null,
-				 item->name,table,item->binary);
+				 item->name,table,item->binary,default_charset_info);
 	return	new Field_string(item_sum->max_length,maybe_null,
 				 item->name,table,item->binary,default_charset_info);
       }
@@ -3576,7 +3576,8 @@ Field *create_tmp_field(THD *thd, TABLE *table,Item *item, Item::Type type,
     case STRING_RESULT:
       if (item->max_length > 255)
 	new_field=  new Field_blob(item->max_length,maybe_null,
-				   item->name,table,item->binary);
+				   item->name,table,item->binary,
+				   item->str_value.charset());
       else
 	new_field= new Field_string(item->max_length,maybe_null,
 				    item->name,table,item->binary,
@@ -4104,7 +4105,9 @@ static bool create_myisam_tmp_table(TABLE *table,TMP_TABLE_PARAM *param,
     {
       Field *field=keyinfo->key_part[i].field;
       seg->flag=     0;
-      seg->language= MY_CHARSET_CURRENT;
+      seg->language= field->binary() ? MY_CHARSET_CURRENT : 
+				     ((Field_str*)field)->charset()->number;
+
       seg->length=   keyinfo->key_part[i].length;
       seg->start=    keyinfo->key_part[i].offset;
       if (field->flags & BLOB_FLAG)