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Manual merge from mysql-5.1-bugteam to mysql-trunk-merge.

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Conflicts:

Text conflict in scripts/Makefile.am
Text conflict in sql/share/Makefile.am
This commit is contained in:
Alexey Kopytov
2010-02-26 16:06:31 +03:00
parent 456926721a 1bb6ea1727
commit 031657c694
18 changed files with 242 additions and 52 deletions
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35
sql/sql_select.cc
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@ -7135,9 +7135,11 @@ eq_ref_table(JOIN *join, ORDER *start_order, JOIN_TAB *tab)
}
if (order)
{
found++;
DBUG_ASSERT(!(order->used & map));
order->used|=map;
if (!(order->used & map))
{
found++;
order->used|= map;
}
continue; // Used in ORDER BY
}
if (!only_eq_ref_tables(join,start_order, (*ref_item)->used_tables()))
@ -8305,7 +8307,8 @@ static Item *eliminate_item_equal(COND *cond, COND_EQUAL *upper_levels,
else
{
DBUG_ASSERT(cond->type() == Item::COND_ITEM);
((Item_cond *) cond)->add_at_head(&eq_list);
if (eq_list.elements)
((Item_cond *) cond)->add_at_head(&eq_list);
}
cond->quick_fix_field();
@ -13424,12 +13427,6 @@ test_if_skip_sort_order(JOIN_TAB *tab,ORDER *order,ha_rows select_limit,
*/
if (select_limit >= table_records)
{
/*
filesort() and join cache are usually faster than reading in
index order and not using join cache
*/
if (tab->type == JT_ALL && tab->join->tables > tab->join->const_tables + 1)
DBUG_RETURN(0);
keys= *table->file->keys_to_use_for_scanning();
keys.merge(table->covering_keys);
@ -13579,6 +13576,19 @@ test_if_skip_sort_order(JOIN_TAB *tab,ORDER *order,ha_rows select_limit,
}
}
}
/*
filesort() and join cache are usually faster than reading in
index order and not using join cache, except in case that chosen
index is clustered primary key.
*/
if ((select_limit >= table_records) &&
(tab->type == JT_ALL &&
tab->join->tables > tab->join->const_tables + 1) &&
((unsigned) best_key != table->s->primary_key ||
!table->file->primary_key_is_clustered()))
DBUG_RETURN(0);
if (best_key >= 0)
{
bool quick_created= FALSE;
@ -15790,7 +15800,7 @@ static bool add_ref_to_table_cond(THD *thd, JOIN_TAB *join_tab)
Item_cond_and *cond=new Item_cond_and();
TABLE *table=join_tab->table;
int error;
int error= 0;
if (!cond)
DBUG_RETURN(TRUE);
@ -15808,7 +15818,8 @@ static bool add_ref_to_table_cond(THD *thd, JOIN_TAB *join_tab)
cond->fix_fields(thd, (Item**)&cond);
if (join_tab->select)
{
error=(int) cond->add(join_tab->select->cond);
if (join_tab->select->cond)
error=(int) cond->add(join_tab->select->cond);
join_tab->select_cond=join_tab->select->cond=cond;
}
else if ((join_tab->select= make_select(join_tab->table, 0, 0, cond, 0,