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, 7 deletions

diff --git a/sql/item_sum.h b/sql/item_sum.h
index 4cded41a9f6..ef947900fd2 100644
--- a/sql/item_sum.h
+++ b/sql/item_sum.h
@@ -415,13 +415,7 @@ class Item_sum_hybrid :public Item_sum
   table_map used_tables() const { return used_table_cache; }
   bool const_item() const { return !used_table_cache; }
 
-  void clear()
-  {
-    sum=0.0;
-    sum_int=0;
-    value.length(0);
-    null_value=1;
-  }
+  void clear();
   double val();
   longlong val_int();
   void reset_field();