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simple subselects ported to new select_lex structures

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This commit is contained in:
bell@sanja.is.com.ua
2002-05-12 23:46:42 +03:00
parent 4cb3760b44
commit e077890b04
40 changed files with 2541 additions and 349 deletions
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67
sql/sql_select.h
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@@ -149,8 +149,7 @@ class TMP_TABLE_PARAM {
}
};
class JOIN {
class JOIN :public Sql_alloc{
public:
JOIN_TAB *join_tab,**best_ref,**map2table;
TABLE **table,**all_tables,*sort_by_table;
@@ -175,6 +174,70 @@ class JOIN {
MYSQL_LOCK *lock;
// unit structure (with global parameters) for this select
SELECT_LEX_UNIT *unit;
// select that processed
SELECT_LEX *select_lex;
bool select_distinct, //Is select distinct?
no_order, simple_order, simple_group,
skip_sort_order, need_tmp,
hidden_group_fields,
buffer_result;
DYNAMIC_ARRAY keyuse;
Item::cond_result cond_value;
List<Item> all_fields;
List<Item> & fields_list; // hold field list passed to mysql_select
int error;
ORDER *order, *group_list, *proc_param; //hold parameters of mysql_select
COND *conds; // ---"---
TABLE_LIST *tables_list; //hold 'tables' parameter of mysql_selec
SQL_SELECT *select; //created in optimisation phase
TABLE *exec_tmp_table; //used in 'exec' to hold temporary
my_bool test_function_query; // need to return select items 1 row
const char *zero_result_cause; // not 0 if exec must return zero result
JOIN(THD *thd, List<Item> &fields,
ulong select_options, select_result *result):
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),
thd(thd),
sum_funcs(0),
having(0),
select_options(select_options),
result(result),
lock(thd->lock),
select_lex(0), //for safety
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),
select(0),
exec_tmp_table(0),
test_function_query(0),
zero_result_cause(0)
{
fields_list = fields;
bzero((char*) &keyuse,sizeof(keyuse));
tmp_table_param.copy_field=0;
tmp_table_param.end_write_records= HA_POS_ERROR;
}
int prepare(TABLE_LIST *tables,
COND *conds, ORDER *order, ORDER *group, Item *having,
ORDER *proc_param, SELECT_LEX *select, SELECT_LEX_UNIT *unit);
int optimize();
int global_optimize();
void exec();
int cleanup(THD *thd);
};