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Merge chunk from trunk.

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This commit is contained in:
Chad MILLER
2008-07-10 14:47:53 -04:00
parent 93aba6a883 ac15eee942
commit 06756c19c5
379 changed files with 28819 additions and 5415 deletions
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51
sql/sql_select.cc
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@ -217,6 +217,7 @@ static void select_describe(JOIN *join, bool need_tmp_table,bool need_order,
bool distinct, const char *message=NullS);
static Item *remove_additional_cond(Item* conds);
static void add_group_and_distinct_keys(JOIN *join, JOIN_TAB *join_tab);
static bool test_if_ref(Item_field *left_item,Item *right_item);
/*
@ -681,9 +682,6 @@ err:
without "checking NULL", remove the predicates that were pushed down
into the subquery.
We can remove the equalities that will be guaranteed to be true by the
fact that subquery engine will be using index lookup.
If the subquery compares scalar values, we can remove the condition that
was wrapped into trig_cond (it will be checked when needed by the subquery
engine)
@ -693,6 +691,12 @@ err:
and non-NULL values, we'll do a full table scan and will rely on the
equalities corresponding to non-NULL parts of left tuple to filter out
non-matching records.
TODO: We can remove the equalities that will be guaranteed to be true by the
fact that subquery engine will be using index lookup. This must be done only
for cases where there are no conversion errors of significance, e.g. 257
that is searched in a byte. But this requires homogenization of the return
codes of all Field*::store() methods.
*/
void JOIN::remove_subq_pushed_predicates(Item **where)
@ -700,17 +704,13 @@ void JOIN::remove_subq_pushed_predicates(Item **where)
if (conds->type() == Item::FUNC_ITEM &&
((Item_func *)this->conds)->functype() == Item_func::EQ_FUNC &&
((Item_func *)conds)->arguments()[0]->type() == Item::REF_ITEM &&
((Item_func *)conds)->arguments()[1]->type() == Item::FIELD_ITEM)
((Item_func *)conds)->arguments()[1]->type() == Item::FIELD_ITEM &&
test_if_ref ((Item_field *)((Item_func *)conds)->arguments()[1],
((Item_func *)conds)->arguments()[0]))
{
*where= 0;
return;
}
if (conds->type() == Item::COND_ITEM &&
((class Item_func *)this->conds)->functype() ==
Item_func::COND_AND_FUNC)
{
*where= remove_additional_cond(conds);
}
}
@ -888,13 +888,6 @@ JOIN::optimize()
DBUG_PRINT("error",("Error from opt_sum_query"));
DBUG_RETURN(1);
}
if (res < 0)
{
DBUG_PRINT("info",("No matching min/max row"));
zero_result_cause= "No matching min/max row";
error=0;
DBUG_RETURN(0);
}
DBUG_PRINT("info",("Select tables optimized away"));
zero_result_cause= "Select tables optimized away";
tables_list= 0; // All tables resolved
@ -1244,7 +1237,7 @@ JOIN::optimize()
{
if (!having)
{
Item *where= 0;
Item *where= conds;
if (join_tab[0].type == JT_EQ_REF &&
join_tab[0].ref.items[0]->name == in_left_expr_name)
{
@ -2351,6 +2344,11 @@ static ha_rows get_quick_record_count(THD *thd, SQL_SELECT *select,
{
int error;
DBUG_ENTER("get_quick_record_count");
#ifndef EMBEDDED_LIBRARY // Avoid compiler warning
char buff[STACK_BUFF_ALLOC];
#endif
if (check_stack_overrun(thd, STACK_MIN_SIZE, buff))
DBUG_RETURN(0); // Fatal error flag is set
if (select)
{
select->head=table;
@ -3705,7 +3703,7 @@ update_ref_and_keys(THD *thd, DYNAMIC_ARRAY *keyuse,JOIN_TAB *join_tab,
found_eq_constant=0;
for (i=0 ; i < keyuse->elements-1 ; i++,use++)
{
if (!use->used_tables)
if (!use->used_tables && use->optimize != KEY_OPTIMIZE_REF_OR_NULL)
use->table->const_key_parts[use->key]|= use->keypart_map;
if (use->keypart != FT_KEYPART)
{
@ -5393,7 +5391,8 @@ get_store_key(THD *thd, KEYUSE *keyuse, table_map used_tables,
(keyuse->val->type() == Item::REF_ITEM &&
((Item_ref*)keyuse->val)->ref_type() == Item_ref::OUTER_REF &&
(*(Item_ref**)((Item_ref*)keyuse->val)->ref)->ref_type() ==
Item_ref::DIRECT_REF) )
Item_ref::DIRECT_REF &&
keyuse->val->real_item()->type() == Item::FIELD_ITEM))
return new store_key_field(thd,
key_part->field,
key_buff + maybe_null,
@ -9055,6 +9054,8 @@ static Field *create_tmp_field_from_item(THD *thd, Item *item, TABLE *table,
*((*copy_func)++) = item; // Save for copy_funcs
if (modify_item)
item->set_result_field(new_field);
if (item->type() == Item::NULL_ITEM)
new_field->is_created_from_null_item= TRUE;
return new_field;
}
@ -10321,7 +10322,8 @@ Next_select_func setup_end_select_func(JOIN *join)
/* Set up select_end */
if (table)
{
if (table->group && tmp_tbl->sum_func_count)
if (table->group && tmp_tbl->sum_func_count &&
!tmp_tbl->precomputed_group_by)
{
if (table->s->keys)
{
@ -11952,8 +11954,12 @@ static bool test_if_ref(Item_field *left_item,Item *right_item)
Item *ref_item=part_of_refkey(field->table,field);
if (ref_item && ref_item->eq(right_item,1))
{
right_item= right_item->real_item();
if (right_item->type() == Item::FIELD_ITEM)
return (field->eq_def(((Item_field *) right_item)->field));
/* remove equalities injected by IN->EXISTS transformation */
else if (right_item->type() == Item::CACHE_ITEM)
return ((Item_cache *)right_item)->eq_def (field);
if (right_item->const_item() && !(right_item->is_null()))
{
/*
@ -15392,7 +15398,8 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
{
if (tab->use_quick == 2)
{
char buf[MAX_KEY/8+1];
/* 4 bits per 1 hex digit + terminating '\0' */
char buf[MAX_KEY / 4 + 1];
extra.append(STRING_WITH_LEN("; Range checked for each "
"record (index map: 0x"));
extra.append(tab->keys.print(buf));