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avoiding of allocating JOIN structure on every UNION executing

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(SCRUM)


sql/sql_select.cc:
  support of fake_select_lex join clean
  removed compiler warning
sql/sql_select.h:
  JOIN clean for fake_select_lex
sql/sql_union.cc:
  avoiding of allocating JOIN structure on every UNION executing
This commit is contained in:
unknown
2003-07-05 17:21:39 +03:00
parent 01eb6a4a22
commit a6943f9988
3 changed files with 93 additions and 38 deletions
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81
sql/sql_select.h
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@ -190,45 +190,62 @@ class JOIN :public Sql_alloc
bool optimized; // flag to avoid double optimization in EXPLAIN
JOIN(THD *thd_arg, List<Item> &fields, ulong select_options_arg,
select_result *result_arg):
join_tab(0),
table(0),
tables(0), const_tables(0),
sort_and_group(0), first_record(0),
do_send_rows(1),
send_records(0), found_records(0), examined_rows(0),
exec_tmp_table1(0), exec_tmp_table2(0),
thd(thd_arg),
sum_funcs(0),
procedure(0),
having(0), tmp_having(0),
select_options(select_options_arg),
result(result_arg),
lock(thd_arg->lock),
select_lex(0), //for safety
tmp_join(0),
select_distinct(test(select_options & SELECT_DISTINCT)),
no_order(0), simple_order(0), simple_group(0), skip_sort_order(0),
need_tmp(0),
hidden_group_fields (0), /*safety*/
buffer_result(test(select_options & OPTION_BUFFER_RESULT) &&
!test(select_options & OPTION_FOUND_ROWS)),
all_fields(fields),
fields_list(fields),
error(0),
select(0),
ref_pointer_array(0), items0(0), items1(0), items2(0), items3(0),
ref_pointer_array_size(0),
zero_result_cause(0),
optimized(0)
select_result *result_arg)
:fields_list(fields)
{
init(thd_arg, fields, select_options_arg, result_arg);
}
void init(THD *thd_arg, List<Item> &fields, ulong select_options_arg,
select_result *result_arg)
{
join_tab= 0;
table= 0;
tables= 0;
const_tables= 0;
sort_and_group= 0;
first_record= 0;
do_send_rows= 1;
send_records= 0;
found_records= 0;
examined_rows= 0;
exec_tmp_table1= 0;
exec_tmp_table2= 0;
thd= thd_arg;
sum_funcs= 0;
procedure= 0;
having= 0;
tmp_having= 0;
select_options= select_options_arg;
result= result_arg;
lock= thd_arg->lock;
select_lex= 0; //for safety
tmp_join= 0;
select_distinct= test(select_options & SELECT_DISTINCT);
no_order= 0;
simple_order= 0;
simple_group= 0;
skip_sort_order= 0;
need_tmp= 0;
hidden_group_fields= 0; /*safety*/
buffer_result= test(select_options & OPTION_BUFFER_RESULT) &&
!test(select_options & OPTION_FOUND_ROWS);
all_fields= fields;
fields_list= fields;
error= 0;
select= 0;
ref_pointer_array= items0= items1= items2= items3= 0;
ref_pointer_array_size= 0;
zero_result_cause= 0;
optimized= 0;
fields_list = fields;
bzero((char*) &keyuse,sizeof(keyuse));
tmp_table_param.copy_field=0;
tmp_table_param.end_write_records= HA_POS_ERROR;
rollup.state= ROLLUP::STATE_NONE;
}
int prepare(Item ***rref_pointer_array, TABLE_LIST *tables, uint wind_num,
COND *conds, uint og_num, ORDER *order, ORDER *group,
Item *having, ORDER *proc_param, SELECT_LEX *select,