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optimisation of independent ALL/ANY with aggregate function (WL#1115) (SCRUM)

Browse source 
mysql-test/r/subselect.result:
  test of new optimisation
mysql-test/t/subselect.test:
  test of new optimisation
sql/item_subselect.cc:
  special subselect to finding max/min of returned values
  optimisation of independent ALL/ANY with aggregate function
sql/item_subselect.h:
  special subselect to finding max/min of returned values
sql/sql_class.cc:
  class for collaction result for max/min subquery
sql/sql_class.h:
  class for collaction result for max/min subquery
This commit is contained in:
unknown 2003-08-12 12:38:03 +03:00
commit 964ffc34b1
6 changed files with 184 additions and 30 deletions
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10
sql/item_subselect.h
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@ -130,6 +130,7 @@ public:
max_length= item->max_length;
decimals= item->decimals;
}
Item_singlerow_subselect() :Item_subselect(), value(0), row (0) {}
subs_type substype() { return SINGLEROW_SUBS; }
@ -153,6 +154,15 @@ public:
friend class select_singlerow_subselect;
};
/* used in static ALL/ANY optimisation */
class Item_maxmin_subselect: public Item_singlerow_subselect
{
public:
Item_maxmin_subselect(THD *thd, st_select_lex *select_lex, bool max);
Item_maxmin_subselect(Item_maxmin_subselect *item)
:Item_singlerow_subselect(item) {}
};
/* exists subselect */
class Item_exists_subselect :public Item_subselect