Fix for a bug #1231

Parse error caused global ORDER BY to be initialized although it should
not have been.

mysql-test/r/derived.result

@@ -204,3 +204,5 @@ select 2 as a from (select * from a1) b;
 a
 2
 drop table a1;
+select mail_id,  if(folder.f_description!='', folder.f_description, folder.f_name) as folder_name,  date, address_id, phrase, address,  subject from folder, (select  mail.mail_id as mail_id,  date_format(mail.h_date, '%b %e, %Y %h:%i') as date,  mail.folder_id,  sender.address_id as address_id,  sender.phrase as phrase, sender.address as address,    mail.h_subject as subject from    mail left join mxa as mxa_sender on mail.mail_id=mxa_sender.mail_id and mxa_sender.type='from' left join address as sender on mxa_sender.address_id=sender.address_id  mxa as mxa_recipient,   address as recipient, where 1     and mail.mail_id=mxa_recipient.mail_id   and mxa_recipient.address_id=recipient.address_id   and mxa_recipient.type='to'  and  match(sender.phrase, sender.address, sender.comment) against ('jeremy' in boolean mode)   and  match(recipient.phrase, recipient.address, recipient.comment) against ('monty' in boolean mode) order by mail.h_date desc limit 0, 25 ) as query where query.folder_id=folder.folder_id;
+ERROR 42000: You have an error in your SQL syntax.  Check the manual that corresponds to your MySQL server version for the right syntax to use near 'mxa as mxa_recipient,   address as recipient, where 1     and mail.mail_id=mxa_r' at line 1

mysql-test/t/derived.test

@@ -107,3 +107,5 @@ select 2 as a from (select * from a1) b;
 use test;
 select 2 as a from (select * from a1) b;
 drop table a1;
+--error 1064
+select mail_id,  if(folder.f_description!='', folder.f_description, folder.f_name) as folder_name,  date, address_id, phrase, address,  subject from folder, (select  mail.mail_id as mail_id,  date_format(mail.h_date, '%b %e, %Y %h:%i') as date,  mail.folder_id,  sender.address_id as address_id,  sender.phrase as phrase, sender.address as address,    mail.h_subject as subject from    mail left join mxa as mxa_sender on mail.mail_id=mxa_sender.mail_id and mxa_sender.type='from' left join address as sender on mxa_sender.address_id=sender.address_id  mxa as mxa_recipient,   address as recipient, where 1     and mail.mail_id=mxa_recipient.mail_id   and mxa_recipient.address_id=recipient.address_id   and mxa_recipient.type='to'  and  match(sender.phrase, sender.address, sender.comment) against ('jeremy' in boolean mode)   and  match(recipient.phrase, recipient.address, recipient.comment) against ('monty' in boolean mode) order by mail.h_date desc limit 0, 25 ) as query where query.folder_id=folder.folder_id;

sql/sql_yacc.yy

@@ -5267,9 +5267,12 @@ optional_order_or_limit:
 	    SELECT_LEX *sel= lex->current_select;
 	    SELECT_LEX_UNIT *unit= sel->master_unit();
 	    SELECT_LEX *fake= unit->fake_select_lex;
-	    unit->global_parameters= fake;
-	    fake->no_table_names_allowed= 1;
-	    lex->current_select= fake;
+	    if (fake)
+	    {
+	      unit->global_parameters= fake;
+	      fake->no_table_names_allowed= 1;
+	      lex->current_select= fake;
+	    }
 	    thd->where= "global ORDER clause";
 	  }
 	order_or_limit