many, many changes

mysql-test/r/subselect.result:
  Auto merged
sql/sql_base.cc:
  Auto merged
sql/sql_lex.cc:
  Auto merged
sql/sql_parse.cc:
  Auto merged
include/mysqld_error.h:
  Merging changes ...
mysql-test/t/subselect.test:
  Merging changes ...
sql/share/czech/errmsg.txt:
  Merging changes ...
sql/share/danish/errmsg.txt:
  Merging changes ...
sql/share/dutch/errmsg.txt:
  Merging changes ...
sql/share/english/errmsg.txt:
  Merging changes ...
sql/share/estonian/errmsg.txt:
  Merging changes ...
sql/share/french/errmsg.txt:
  Merging changes ...
sql/share/german/errmsg.txt:
  Merging changes ...
sql/share/greek/errmsg.txt:
  Merging changes ...
sql/share/hungarian/errmsg.txt:
  Merging changes ...
sql/share/italian/errmsg.txt:
  Merging changes ...
sql/share/japanese/errmsg.txt:
  Merging changes ...
sql/share/korean/errmsg.txt:
  Merging changes ...
sql/share/norwegian-ny/errmsg.txt:
  Merging changes ...
sql/share/norwegian/errmsg.txt:
  Merging changes ...
sql/share/polish/errmsg.txt:
  Merging changes ...
sql/share/portuguese/errmsg.txt:
  Merging changes ...
sql/share/romanian/errmsg.txt:
  Merging changes ...
sql/share/russian/errmsg.txt:
  Merging changes ...
sql/share/serbian/errmsg.txt:
  Merging changes ...
sql/share/slovak/errmsg.txt:
  Merging changes ...
sql/share/spanish/errmsg.txt:
  Merging changes ...
sql/share/swedish/errmsg.txt:
  Merging changes ...
sql/share/ukrainian/errmsg.txt:
  Merging changes ...

include/mysqld_error.h

@@ -262,5 +262,6 @@
 #define ER_CYCLIC_REFERENCE 1243
 #define ER_AUTO_CONVERT	1244
 #define ER_ILLEGAL_REFERENCE 1245
-#define ER_SELECT_REDUCED 1246
-#define ER_ERROR_MESSAGES 247
+#define ER_DERIVED_MUST_HAVE_ALIAS 1246
+#define ER_SELECT_REDUCED 1247
+#define ER_ERROR_MESSAGES 248