keep old engine & JOIN if we changed subquery Item (Bug #3646)

mysql-test/r/subselect.result:
  ALL/ANY test
mysql-test/t/subselect.test:
  ALL/ANY test
sql/item_subselect.cc:
  keep old engine & JOIN if we changed subquery Item, which allow avoid second all SELECT items fix_fields call with pervios clean up (because of second setup_tables which remove table->key_use and maybe something else)
  keep list when we change Item in SELECT list
  processing inserted max/min function (now JOIN::prepare will be called only once)
  methods of changing item for subselect engines
sql/item_subselect.h:
  change item & results procedure
sql/item_sum.cc:
  Item_sum_hybrid::clear moved to .cc file (to keep .h clean and to make inserving/removing debug info easy)
sql/item_sum.h:
  Item_sum_hybrid::clear moved to .cc file (to keep .h clean and to make inserving/removing debug info easy)
sql/sql_lex.cc:
  note about new method
sql/sql_lex.h:
  method for changing result of UNION JOINs
sql/sql_select.cc:
  method for changing result in JOIN
sql/sql_select.h:
  method for changing result in JOIN
sql/sql_union.cc:
  method for changing result in JOIN

1 files changed, 1 insertions, 0 deletions

diff --git a/sql/sql_lex.h b/sql/sql_lex.h
index aa3e81fd9c9..557c037c799 100644
--- a/sql/sql_lex.h
+++ b/sql/sql_lex.h
@@ -371,6 +371,7 @@ public:
   void print(String *str);
 
   ulong init_prepare_fake_select_lex(THD *thd);
+  int change_result(select_subselect *result, select_subselect *old_result);
 
   friend void mysql_init_query(THD *thd);
   friend int subselect_union_engine::exec();