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Fix UNION

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New faster list iterators
Change list code to be simpler and faster
Optimize count(distinct)
New error messages for UNION
Make create_tmp_table more general to be usable by UNION
This commit is contained in:
monty@tik.mysql.fi
2001-08-02 06:29:50 +03:00
parent 423f2851c5
commit b13d453d50
57 changed files with 798 additions and 472 deletions
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6
sql/opt_sum.cc
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@ -32,7 +32,7 @@ static bool find_range_key(TABLE_REF *ref, Field* field,COND *cond);
int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds)
{
List_iterator<Item> it(all_fields);
List_iterator_fast<Item> it(all_fields);
int const_result=1;
bool recalc_const_item=0;
table_map removed_tables=0;
@ -205,7 +205,7 @@ uint count_table_entries(COND *cond,TABLE *table)
if (((Item_cond*) cond)->functype() == Item_func::COND_OR_FUNC)
return (cond->used_tables() & table->map) ? MAX_REF_PARTS+1 : 0;
List_iterator<Item> li(*((Item_cond*) cond)->argument_list());
List_iterator_fast<Item> li(*((Item_cond*) cond)->argument_list());
Item *item;
uint count=0;
while ((item=li++))
@ -250,7 +250,7 @@ bool part_of_cond(COND *cond,Field *field)
if (((Item_cond*) cond)->functype() == Item_func::COND_OR_FUNC)
return 0; // Already checked
List_iterator<Item> li(*((Item_cond*) cond)->argument_list());
List_iterator_fast<Item> li(*((Item_cond*) cond)->argument_list());
Item *item;
while ((item=li++))
{