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Some simple optimisation

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= ANY and <> ALL converted to (NOT) IN to get advantage of IN optimisation


mysql-test/r/subselect.result:
  test of new optimisation
mysql-test/t/subselect.test:
  test of new optimisation
sql/mysql_priv.h:
  new function for subquery creation
sql/sql_parse.cc:
  layout fix
  new function for subquery creation (convert some ALL/ANY to IN)
sql/sql_yacc.yy:
  same code blocks replaced with function
This commit is contained in:
unknown
2003-10-08 17:40:54 +03:00
parent 0f81ecf501
commit 1db2b4e60e
5 changed files with 69 additions and 18 deletions
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39
sql/sql_parse.cc
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@ -4610,32 +4610,71 @@ bool check_simple_select()
return 0;
}
compare_func_creator comp_eq_creator(bool invert)
{
return invert?&Item_bool_func2::ne_creator:&Item_bool_func2::eq_creator;
}
compare_func_creator comp_ge_creator(bool invert)
{
return invert?&Item_bool_func2::lt_creator:&Item_bool_func2::ge_creator;
}
compare_func_creator comp_gt_creator(bool invert)
{
return invert?&Item_bool_func2::le_creator:&Item_bool_func2::gt_creator;
}
compare_func_creator comp_le_creator(bool invert)
{
return invert?&Item_bool_func2::gt_creator:&Item_bool_func2::le_creator;
}
compare_func_creator comp_lt_creator(bool invert)
{
return invert?&Item_bool_func2::ge_creator:&Item_bool_func2::lt_creator;
}
compare_func_creator comp_ne_creator(bool invert)
{
return invert?&Item_bool_func2::eq_creator:&Item_bool_func2::ne_creator;
}
/*
Construct ALL/ANY/SOME subquery Item
SYNOPSIS
all_any_subquery_creator()
left_expr - pointer to left expression
cmp - compare function creator
all - true if we create ALL subquery
select_lex - pointer on parsed subquery structure
RETURN VALUE
constructed Item (or 0 if out of memory)
*/
Item * all_any_subquery_creator(Item *left_expr,
chooser_compare_func_creator cmp,
bool all,
SELECT_LEX *select_lex)
{
if ((cmp == &comp_eq_creator) and !all) // = ANY <=> IN
return new Item_in_subselect(left_expr, select_lex);
if ((cmp == &comp_ne_creator) and all) // <> ALL <=> NOT IN
return new Item_func_not(new Item_in_subselect(left_expr, select_lex));
Item_allany_subselect *it=
new Item_allany_subselect(left_expr, (*cmp)(all), select_lex);
if (all)
return it->upper_not= new Item_func_not_all(it); /* ALL */
return it; /* ANY/SOME */
}