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Merge mskold@bk-internal.mysql.com:/home/bk/mysql-5.0

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into mysql.com:/usr/local/home/marty/MySQL/mysql-5.0
This commit is contained in:
mskold@mysql.com
2005-06-02 17:06:51 +02:00
parent 565e3ef640 49e5fafeaf
commit 9cebe281bb
246 changed files with 4075 additions and 1972 deletions
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163
sql/sql_select.cc
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@ -17,7 +17,9 @@
/* mysql_select and join optimization */
#ifdef __GNUC__
#include <my_global.h>
#ifdef USE_PRAGMA_IMPLEMENTATION
#pragma implementation // gcc: Class implementation
#endif
@ -35,7 +37,7 @@ const char *join_type_str[]={ "UNKNOWN","system","const","eq_ref","ref",
};
const key_map key_map_empty(0);
const key_map key_map_full(~0);
const key_map key_map_full(~(uint)0);
static void optimize_keyuse(JOIN *join, DYNAMIC_ARRAY *keyuse_array);
static bool make_join_statistics(JOIN *join, TABLE_LIST *leaves, COND *conds,
@ -233,7 +235,7 @@ bool handle_select(THD *thd, LEX *lex, select_result *result,
else
{
SELECT_LEX_UNIT *unit= &lex->unit;
unit->set_limit(unit->global_parameters, select_lex);
unit->set_limit(unit->global_parameters);
/*
'options' of mysql_select will be set in JOIN, as far as JOIN for
every PS/SP execution new, we will not need reset this flag if
@ -342,7 +344,7 @@ JOIN::prepare(Item ***rref_pointer_array,
if ((!(select_options & OPTION_SETUP_TABLES_DONE) &&
setup_tables(thd, tables_list, &conds, &select_lex->leaf_tables,
FALSE, FALSE)) ||
FALSE)) ||
setup_wild(thd, tables_list, fields_list, &all_fields, wild_num) ||
select_lex->setup_ref_array(thd, og_num) ||
setup_fields(thd, (*rref_pointer_array), tables_list, fields_list, 1,
@ -465,13 +467,6 @@ JOIN::prepare(Item ***rref_pointer_array,
count_field_types(&tmp_table_param, all_fields, 0);
ref_pointer_array_size= all_fields.elements*sizeof(Item*);
this->group= group_list != 0;
row_limit= ((select_distinct || order || group_list) ? HA_POS_ERROR :
unit_arg->select_limit_cnt);
/* select_limit is used to decide if we are likely to scan the whole table */
select_limit= unit_arg->select_limit_cnt;
if (having || (select_options & OPTION_FOUND_ROWS))
select_limit= HA_POS_ERROR;
do_send_rows = (unit_arg->select_limit_cnt) ? 1 : 0;
unit= unit_arg;
#ifdef RESTRICTED_GROUP
@ -550,6 +545,13 @@ JOIN::optimize()
DBUG_RETURN(0);
optimized= 1;
row_limit= ((select_distinct || order || group_list) ? HA_POS_ERROR :
unit->select_limit_cnt);
/* select_limit is used to decide if we are likely to scan the whole table */
select_limit= unit->select_limit_cnt;
if (having || (select_options & OPTION_FOUND_ROWS))
select_limit= HA_POS_ERROR;
do_send_rows = (unit->select_limit_cnt) ? 1 : 0;
// Ignore errors of execution if option IGNORE present
if (thd->lex->ignore)
thd->lex->current_select->no_error= 1;
@ -1110,18 +1112,7 @@ int
JOIN::reinit()
{
DBUG_ENTER("JOIN::reinit");
/* TODO move to unit reinit */
unit->set_limit(select_lex, select_lex);
/* conds should not be used here, it is added just for safety */
if (tables_list)
{
if (setup_tables(thd, tables_list, &conds, &select_lex->leaf_tables,
TRUE, FALSE))
DBUG_RETURN(1);
}
/* Reset of sum functions */
first_record= 0;
if (exec_tmp_table1)
@ -1147,6 +1138,7 @@ JOIN::reinit()
if (tmp_join)
restore_tmp();
/* Reset of sum functions */
if (sum_funcs)
{
Item_sum *func, **func_ptr= sum_funcs;
@ -2825,17 +2817,14 @@ add_key_fields(KEY_FIELD **key_fields,uint *and_level,
if (cond_func->functype() == Item_func::NOT_FUNC)
{
Item *item= cond_func->arguments()[0];
/*
At this moment all NOT before simple comparison predicates
are eliminated. NOT IN and NOT BETWEEN are treated similar
IN and BETWEEN respectively.
/*
At this moment all NOT before simple comparison predicates
are eliminated. NOT IN and NOT BETWEEN are treated similar
IN and BETWEEN respectively.
*/
if (item->type() == Item::FUNC_ITEM &&
((Item_func *) item)->select_optimize() == Item_func::OPTIMIZE_KEY)
{
add_key_fields(key_fields,and_level,item,usable_tables);
return;
}
return;
}
switch (cond_func->select_optimize()) {
@ -3799,8 +3788,7 @@ choose_plan(JOIN *join, table_map join_tables)
Don't update last_query_cost for 'show status' command
*/
if (join->thd->lex->orig_sql_command != SQLCOM_SHOW_STATUS)
last_query_cost= join->best_read;
join->thd->status_var.last_query_cost= join->best_read;
DBUG_VOID_RETURN;
}
@ -5100,7 +5088,7 @@ make_simple_join(JOIN *join,TABLE *tmp_table)
join_tab->select_cond=0;
join_tab->quick=0;
join_tab->type= JT_ALL; /* Map through all records */
join_tab->keys.init(~0); /* test everything in quick */
join_tab->keys.init(~(uint)0); /* test everything in quick */
join_tab->info=0;
join_tab->on_expr_ref=0;
join_tab->last_inner= 0;
@ -12322,7 +12310,7 @@ setup_copy_fields(THD *thd, TMP_TABLE_PARAM *param,
{
Item *pos;
List_iterator_fast<Item> li(all_fields);
Copy_field *copy;
Copy_field *copy= NULL;
res_selected_fields.empty();
res_all_fields.empty();
List_iterator_fast<Item> itr(res_all_fields);
@ -12330,7 +12318,8 @@ setup_copy_fields(THD *thd, TMP_TABLE_PARAM *param,
uint i, border= all_fields.elements - elements;
DBUG_ENTER("setup_copy_fields");
if (!(copy=param->copy_field= new Copy_field[param->field_count]))
if (param->field_count &&
!(copy=param->copy_field= new Copy_field[param->field_count]))
goto err2;
param->copy_funcs.empty();
@ -12369,9 +12358,12 @@ setup_copy_fields(THD *thd, TMP_TABLE_PARAM *param,
char *tmp=(char*) sql_alloc(field->pack_length()+1);
if (!tmp)
goto err;
copy->set(tmp, item->result_field);
item->result_field->move_field(copy->to_ptr,copy->to_null_ptr,1);
copy++;
if (copy)
{
copy->set(tmp, item->result_field);
item->result_field->move_field(copy->to_ptr,copy->to_null_ptr,1);
copy++;
}
}
}
else if ((pos->type() == Item::FUNC_ITEM ||
@ -12414,7 +12406,8 @@ setup_copy_fields(THD *thd, TMP_TABLE_PARAM *param,
DBUG_RETURN(0);
err:
delete [] param->copy_field; // This is never 0
if (copy)
delete [] param->copy_field; // This is never 0
param->copy_field=0;
err2:
DBUG_RETURN(TRUE);
@ -12821,6 +12814,76 @@ void free_underlaid_joins(THD *thd, SELECT_LEX *select)
ROLLUP handling
****************************************************************************/
/*
Replace occurences of group by fields in an expression by ref items
SYNOPSIS
change_group_ref()
thd reference to the context
expr expression to make replacement
group_list list of references to group by items
changed out: returns 1 if item contains a replaced field item
DESCRIPTION
The function replaces occurrences of group by fields in expr
by ref objects for these fields unless they are under aggregate
functions.
IMPLEMENTATION
The function recursively traverses the tree of the expr expression,
looks for occurrences of the group by fields that are not under
aggregate functions and replaces them for the corresponding ref items.
NOTES
This substitution is needed GROUP BY queries with ROLLUP if
SELECT list contains expressions over group by attributes.
EXAMPLES
SELECT a+1 FROM t1 GROUP BY a WITH ROLLUP
SELECT SUM(a)+a FROM t1 GROUP BY a WITH ROLLUP
RETURN
0 if ok
1 on error
*/
static bool change_group_ref(THD *thd, Item_func *expr, ORDER *group_list,
bool *changed)
{
if (expr->arg_count)
{
Item **arg,**arg_end;
for (arg= expr->arguments(),
arg_end= expr->arguments()+expr->arg_count;
arg != arg_end; arg++)
{
Item *item= *arg;
if (item->type() == Item::FIELD_ITEM || item->type() == Item::REF_ITEM)
{
ORDER *group_tmp;
for (group_tmp= group_list; group_tmp; group_tmp= group_tmp->next)
{
if (item->eq(*group_tmp->item,0))
{
Item *new_item;
if(!(new_item= new Item_ref(group_tmp->item, 0, item->name)))
return 1; // fatal_error is set
thd->change_item_tree(arg, new_item);
*changed= TRUE;
}
}
}
else if (item->type() == Item::FUNC_ITEM)
{
if (change_group_ref(thd, (Item_func *) item, group_list, changed))
return 1;
}
}
}
return 0;
}
/* Allocate memory needed for other rollup functions */
bool JOIN::rollup_init()
@ -12865,19 +12928,31 @@ bool JOIN::rollup_init()
for (j=0 ; j < fields_list.elements ; j++)
rollup.fields[i].push_back(rollup.null_items[i]);
}
List_iterator_fast<Item> it(fields_list);
List_iterator_fast<Item> it(all_fields);
Item *item;
while ((item= it++))
{
ORDER *group_tmp;
for (group_tmp= group_list; group_tmp; group_tmp= group_tmp->next)
{
if (*group_tmp->item == item)
if (item->eq(*group_tmp->item,0))
item->maybe_null= 1;
}
if (item->type() == Item::FUNC_ITEM)
{
bool changed= 0;
if (change_group_ref(thd, (Item_func *) item, group_list, &changed))
return 1;
/*
We have to prevent creation of a field in a temporary table for
an expression that contains GROUP BY attributes.
Marking the expression item as 'with_sum_func' will ensure this.
*/
if (changed)
item->with_sum_func= 1;
}
}
return 0;
}
@ -12973,14 +13048,14 @@ bool JOIN::rollup_make_fields(List<Item> &fields_arg, List<Item> &sel_fields,
*(*func)= (Item_sum*) item;
(*func)++;
}
else if (real_fields)
else
{
/* Check if this is something that is part of this group by */
ORDER *group_tmp;
for (group_tmp= start_group, i= pos ;
group_tmp ; group_tmp= group_tmp->next, i++)
{
if (*group_tmp->item == item)
if (item->eq(*group_tmp->item,0))
{
Item_null_result *null_item;
/*
@ -13490,7 +13565,7 @@ bool mysql_explain_union(THD *thd, SELECT_LEX_UNIT *unit, select_result *result)
else
{
thd->lex->current_select= first;
unit->set_limit(unit->global_parameters, first);
unit->set_limit(unit->global_parameters);
res= mysql_select(thd, &first->ref_pointer_array,
(TABLE_LIST*) first->table_list.first,
first->with_wild, first->item_list,