BUG#11869: part2: post-review fixes:

In init_prepare_fake_select_lex() don't empty ftfunc_list. UNION's ORDER BY clause may 
contain MATCH(...), for which fix_index() should be called.

mysql-test/r/fulltext_order_by.result

@@ -163,6 +163,10 @@ text	id	betreff
 (select b.id, b.betreff from t3 b) 
 order by match(betreff) against ('+abc' in boolean mode) desc;
 id	betreff
+(select b.id, b.betreff from t3 b) union 
+(select b.id, b.betreff from t3 b) 
+order by match(betreff) against ('+abc') desc;
+ERROR HY000: Can't find FULLTEXT index matching the column list
 select distinct b.id, b.betreff from t3 b 
 order by match(betreff) against ('+abc' in boolean mode) desc;
 id	betreff

mysql-test/t/fulltext_order_by.test

@@ -138,6 +138,11 @@ order by
 (select b.id, b.betreff from t3 b) 
 order by match(betreff) against ('+abc' in boolean mode) desc;
 
+--error 1191
+(select b.id, b.betreff from t3 b) union 
+(select b.id, b.betreff from t3 b) 
+order by match(betreff) against ('+abc') desc;
+
 select distinct b.id, b.betreff from t3 b 
 order by match(betreff) against ('+abc' in boolean mode) desc;
 

sql/sql_union.cc

@@ -132,8 +132,6 @@ st_select_lex_unit::init_prepare_fake_select_lex(THD *thd)
     options_tmp&= ~OPTION_FOUND_ROWS;
   else if (found_rows_for_union && !thd->lex->describe)
     options_tmp|= OPTION_FOUND_ROWS;
-  fake_select_lex->ftfunc_list_alloc.empty();
-  fake_select_lex->ftfunc_list= &fake_select_lex->ftfunc_list_alloc;
   fake_select_lex->table_list.link_in_list((byte *)&result_table_list,
 					   (byte **)
 					   &result_table_list.next);
@@ -302,7 +300,8 @@ int st_select_lex_unit::prepare(THD *thd_arg, select_result *sel_result,
     /*
       Force the temporary table to be a MyISAM table if we're going to use
       fullext functions (MATCH ... AGAINST .. IN BOOLEAN MODE) when reading
-      from it.
+      from it (this should be removed in 5.2 when fulltext search is moved 
+      out of MyISAM).
     */
     if (global_parameters->ftfunc_list->elements)
       create_options= create_options | TMP_TABLE_FORCE_MYISAM;