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independent ALL/ANY subselect on top of WHERE clause (subselect without GROUP BY or aggregate functions) optimisation

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(SCRUM) (WL#1086)


mysql-test/r/subselect.result:
  new optimisation tests
mysql-test/t/subselect.test:
  new optimisation tests
sql/item_cmpfunc.cc:
  new NOT
sql/item_cmpfunc.h:
  new NOT
sql/item_subselect.cc:
  independent ALL/ANY in top of WHERE clause optimisation
sql/item_subselect.h:
  independent ALL/ANY in top of WHERE clause optimisation
sql/item_sum.cc:
  prevent fixlields call for parameters of min/max if it is already done
sql/sql_union.cc:
  removed debuging print
sql/sql_yacc.yy:
  support of ALL optimisation
This commit is contained in:
unknown
2003-07-24 15:26:21 +03:00
parent d35bf560be
commit 9a3979e234
9 changed files with 130 additions and 21 deletions
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7
sql/item_subselect.h
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@ -53,7 +53,7 @@ public:
enum trans_res {OK, REDUCE, ERROR};
enum subs_type {UNKNOWN_SUBS, SINGLEROW_SUBS,
EXISTS_SUBS, IN_SUBS, ALLANY_SUBS};
EXISTS_SUBS, IN_SUBS, ALL_SUBS, ANY_SUBS};
Item_subselect();
Item_subselect(Item_subselect *item)
@ -202,6 +202,8 @@ protected:
bool was_null;
bool abort_on_null;
public:
Item_func_not_all *upper_not; // point on NOT before ALL subquery
Item_in_subselect(THD *thd, Item * left_expr, st_select_lex *select_lex);
Item_in_subselect(Item_in_subselect *item);
Item_in_subselect(): Item_exists_subselect(), abort_on_null(0) {}
@ -241,7 +243,8 @@ public:
Item_allany_subselect(THD *thd, Item * left_expr, compare_func_creator f,
st_select_lex *select_lex);
Item_allany_subselect(Item_allany_subselect *item);
subs_type substype() { return ALLANY_SUBS; }
// only ALL subquery has upper not
subs_type substype() { return upper_not?ALL_SUBS:ANY_SUBS; }
trans_res select_transformer(JOIN *join);
};